Nikon D100 vs Olympus E-PL9

The Nikon D100 and the Olympus PEN E-PL9 are two digital cameras that were announced, respectively, in February 2002 and February 2018. The D100 is a DSLR, while the E-PL9 is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (D100) and a Four Thirds (E-PL9) sensor. The Nikon has a resolution of 6 megapixels, whereas the Olympus provides 15.9 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications

Nikon D100		Olympus E-PL9
Digital single lens reflex		Mirrorless system camera
Nikon F mount lenses		Micro Four Thirds lenses
6 MP – APS-C sensor		15.9 MP – Four Thirds sensor
no Video		4K/30p Video
ISO 200-800 (200 - 1,600)		ISO 200-6,400 (100 - 25,600)
Optical viewfinder		No viewfinder, LCD framing
1.8" LCD – 118k dots		3.0" LCD – 1040k dots
Fixed screen (not touch-sensitive)		Tilting touchscreen
3 shutter flaps per second		8.6 shutter flaps per second
Lens stabilization only		In-body stabilization
370 shots per battery charge		350 shots per battery charge
144 x 116 x 81 mm, 780 g		117 x 68 x 39 mm, 380 g

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Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D100 and the Olympus PEN E-PL9? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

Body comparison

An illustration of the physical size and weight of the Nikon D100 and the Olympus E-PL9 is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All width, height and depth dimensions are rounded to the nearest millimeter.

The E-PL9 can be obtained in four different colors (black, brown, blue, white), while the D100 is only available in black.

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-PL9 is considerably smaller (52 percent) than the Nikon D100. Moreover, the E-PL9 is substantially lighter (51 percent) than the D100. In this context, it is worth noting that neither the D100 nor the E-PL9 are weather-sealed.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. A larger imaging sensor will tend to go along with bigger and heavier lenses, although exceptions exist. You can compare the optics available for the two cameras in the Nikon Lens Catalog (D100) and the Micro Four Thirds Lens Catalog (E-PL9). Mirrorless cameras, such as the E-PL9, have moreover the advantage that they can use many lenses from other systems via adapters, as they have a relatively short flange to focal plane distance.

Concerning battery life, the D100 gets 370 shots out of its Nikon EN-EL3 battery, while the E-PL9 can take 350 images on a single charge of its Olympus BLS-50 power pack.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

Body Specifications

		Camera Model	Camera Width	Camera Height	Camera Depth	Camera Weight	Battery Life	Weather Sealing	Camera Launch	Launch Price	Street Price
1.		Nikon D100	144 mm	116 mm	81 mm	780 g	370	n	Feb 2002	US$ 1 999	ebay.com
2.		Olympus E-PL9	117 mm	68 mm	39 mm	380 g	350	n	Feb 2018	US$ 599	ebay.com
3.		Canon 10D	150 mm	107 mm	75 mm	850 g	500	n	Feb 2003	US$ 1 999	ebay.com
4.		Nikon D40	124 mm	94 mm	64 mm	522 g	470	n	Nov 2006	US$ 499	ebay.com
5.		Nikon D70	140 mm	111 mm	78 mm	679 g	400	n	Jan 2004	US$ 999	ebay.com
6.		Nikon D70s	140 mm	111 mm	78 mm	679 g	500	n	Apr 2005	US$ 899	ebay.com
7.		Nikon D80	132 mm	103 mm	77 mm	668 g	600	n	Aug 2006	US$ 999	ebay.com
8.		Nikon D90	132 mm	103 mm	77 mm	703 g	850	n	Aug 2008	US$ 1 299	ebay.com
9.		Nikon D200	147 mm	113 mm	74 mm	920 g	400	Y	Nov 2005	US$ 1 699	ebay.com
10.		Nikon D300	147 mm	114 mm	74 mm	925 g	1000	Y	Aug 2007	US$ 1 799	ebay.com
11.		Nikon D300S	147 mm	115 mm	81 mm	938 g	950	Y	Jul 2009	US$ 1 799	ebay.com
12.		Nikon D500	147 mm	115 mm	81 mm	860 g	1240	Y	Jan 2016	US$ 1 999	ebay.com
13.		Olympus E-M10 III	122 mm	84 mm	50 mm	410 g	330	n	Aug 2017	US$ 649	ebay.com
14.		Olympus E-PL6	111 mm	64 mm	38 mm	325 g	360	n	May 2013	US$ 599	ebay.com
15.		Olympus E-PL7	115 mm	67 mm	38 mm	357 g	350	n	Aug 2014	US$ 599	ebay.com
16.		Olympus E-PL8	115 mm	67 mm	38 mm	357 g	350	n	Sep 2016	US$ 549	ebay.com
17.		Olympus E-PL10	117 mm	68 mm	39 mm	380 g	350	n	Oct 2019	US$ 599	ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
Convert to Imperial

Any camera decision will naturally be influenced heavily by the price. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The E-PL9 was launched at a markedly lower price (by 70 percent) than the D100, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

Sensor comparison

The size of the sensor inside a digital camera is one of the key determinants of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels in a sensor of the same technological generation. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Nikon D100 features an APS-C sensor and the Olympus E-PL9 a Four Thirds sensor. The sensor area in the E-PL9 is 39 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 2.0. The sensor in the D100 has a native 3:2 aspect ratio, while the one in the E-PL9 offers a 4:3 aspect.

Despite having a smaller sensor, the E-PL9 offers a higher resolution of 15.9 megapixels, compared with 6 MP of the D100. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.76μm versus 7.85μm for the D100). However, it should be noted that the E-PL9 is much more recent (by 15 years and 11 months) than the D100, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently.

The resolution advantage of the Olympus E-PL9 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the E-PL9 for good quality output (200 dots per inch) amounts to 23 x 17.3 inches or 58.5 x 43.9 cm, for very good quality (250 dpi) 18.4 x 13.8 inches or 46.8 x 35.1 cm, and for excellent quality (300 dpi) 15.4 x 11.5 inches or 39 x 29.3 cm. The corresponding values for the Nikon D100 are 15 x 10 inches or 38.2 x 25.4 cm for good quality, 12 x 8 inches or 30.6 x 20.3 cm for very good quality, and 10 x 6.7 inches or 25.5 x 16.9 cm for excellent quality prints.

The Nikon D100 has a native sensitivity range from ISO 200 to ISO 800, which can be extended to ISO 200-1600. The corresponding ISO settings for the Olympus PEN E-PL9 are ISO 200 to ISO 6400, with the possibility to increase the ISO range to 100-25600.

In terms of underlying technology, the D100 is build around a CCD sensor, while the E-PL9 uses a CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

Sensor Characteristics

		Camera Model	Sensor Class	Resolution (MP)	Horiz. Pixels	Vert. Pixels	Video Format	DXO Portrait	DXO Landscape	DXO Sports	DXO Overall
1.		Nikon D100	APS-C	6.0	3008	2000	none	20.4	9.9	394	48
2.		Olympus E-PL9	Four Thirds	15.9	4608	3456	4K/30p	23.1	12.8	1162	74
3.		Canon 10D	APS-C	6.3	3072	2048	none	21.1	10.9	571	57
4.		Nikon D40	APS-C	6.0	3008	2000	none	21.0	11.0	561	56
5.		Nikon D70	APS-C	6.0	3008	2000	none	20.4	10.3	529	50
6.		Nikon D70s	APS-C	6.0	3008	2000	none	20.4	10.3	529	50
7.		Nikon D80	APS-C	10.0	3872	2592	none	22.1	11.2	524	61
8.		Nikon D90	APS-C	12.2	4288	2848	720/24p	22.7	12.5	977	73
9.		Nikon D200	APS-C	10.0	3872	2592	none	22.3	11.5	583	64
10.		Nikon D300	APS-C	12.2	4288	2848	none	22.1	12.0	679	67
11.		Nikon D300S	APS-C	12.2	4288	2848	720/24p	22.5	12.2	787	70
12.		Nikon D500	APS-C	20.7	5568	3712	4K/30p	24.0	14.0	1324	83
13.		Olympus E-M10 III	Four Thirds	15.9	4608	3456	4K/30p	23.1	12.8	1120	74
14.		Olympus E-PL6	Four Thirds	15.9	4608	3456	1080/30p	22.5	12.0	717	68
15.		Olympus E-PL7	Four Thirds	15.9	4608	3456	1080/30p	22.7	12.4	873	72
16.		Olympus E-PL8	Four Thirds	15.9	4608	3456	1080/30p	23.0	12.6	1030	73
17.		Olympus E-PL10	Four Thirds	15.9	4608	3456	4K/30p	23.3	13.1	1324	76
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras are not only capable of taking still images, but can also record movies. The E-PL9 indeed provides for movie recording, while the D100 does not. The highest resolution format that the E-PL9 can use is 4K/30p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the D100 has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the E-PL9 relies on live view and the rear LCD for framing. The following table reports on some other key feature differences and similarities of the Nikon D100, the Olympus E-PL9, and comparable cameras.

Core Features

		Camera Model	Viewfinder (Type or 000 dots)	Control Panel (yes/no)	LCD Specifications (inch/000 dots)	LCD Attach- ment	Touch Screen (yes/no)	Max Shutter Speed *	Max Shutter Flaps *	Built-in Flash (yes/no)	Built-in Image Stab
1.		Nikon D100	optical	Y	1.8 / 118	fixed	n	1/4000s	3.0/s	Y	n
2.		Olympus E-PL9	none	n	3.0 / 1040	tilting	Y	1/4000s	8.6/s	Y	Y
3.		Canon 10D	optical	Y	1.8 / 118	fixed	n	1/4000s	3.0/s	Y	n
4.		Nikon D40	optical	n	2.5 / 230	fixed	n	1/4000s	2.5/s	Y	n
5.		Nikon D70	optical	n	1.8 / 130	fixed	n	1/8000s	3.0/s	Y	n
6.		Nikon D70s	optical	n	2.0 / 130	fixed	n	1/8000s	3.0/s	Y	n
7.		Nikon D80	optical	n	2.5 / 230	fixed	n	1/4000s	3.0/s	Y	n
8.		Nikon D90	optical	Y	3.0 / 920	fixed	n	1/4000s	4.5/s	Y	n
9.		Nikon D200	optical	Y	2.5 / 230	fixed	n	1/8000s	5.0/s	Y	n
10.		Nikon D300	optical	Y	3.0 / 922	fixed	n	1/8000s	6.0/s	Y	n
11.		Nikon D300S	optical	Y	3.0 / 920	fixed	n	1/8000s	7.0/s	Y	n
12.		Nikon D500	optical	Y	3.2 / 2359	tilting	Y	1/8000s	10.0/s	n	n
13.		Olympus E-M10 III	2360	n	3.0 / 1040	tilting	Y	1/4000s	8.6/s	Y	Y
14.		Olympus E-PL6	optional	n	3.0 / 460	tilting	Y	1/4000s	8.0/s	n	Y
15.		Olympus E-PL7	optional	n	3.0 / 1037	tilting	Y	1/4000s	8.0/s	n	Y
16.		Olympus E-PL8	optional	n	3.0 / 1037	tilting	Y	1/4000s	8.0/s	n	Y
17.		Olympus E-PL10	none	n	3.0 / 1040	tilting	Y	1/4000s	8.6/s	Y	Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that is present on the D100, but is missing on the E-PL9 is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.

The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the E-PL9 is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

The Olympus E-PL9 has an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

The D100 writes its imaging data to Compact Flash cards, while the E-PL9 uses SDXC cards.

Connectivity comparison

For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Nikon D100 and Olympus PEN E-PL9 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

Input-Output Connections

		Camera Model	Hotshoe Port	Internal Mic / Speaker	Microphone Port	Headphone Port	HDMI Port	USB Port	WiFi Support	NFC Support	Bluetooth Support
1.		Nikon D100	Y	- / -	-	-	-	1.1	-	-	-
2.		Olympus E-PL9	Y	stereo / mono	-	-	micro	2.0	Y	-	Y
3.		Canon 10D	Y	- / -	-	-	-	1.1	-	-	-
4.		Nikon D40	Y	- / -	-	-	-	2.0	-	-	-
5.		Nikon D70	Y	- / -	-	-	-	1.0	-	-	-
6.		Nikon D70s	Y	- / -	-	-	-	2.0	-	-	-
7.		Nikon D80	Y	- / -	-	-	-	2.0	-	-	-
8.		Nikon D90	Y	mono / mono	-	-	mini	2.0	-	-	-
9.		Nikon D200	Y	- / -	-	-	-	2.0	-	-	-
10.		Nikon D300	Y	- / -	-	-	mini	2.0	-	-	-
11.		Nikon D300S	Y	stereo / mono	Y	-	mini	2.0	-	-	-
12.		Nikon D500	Y	stereo / mono	Y	Y	mini	3.0	Y	Y	Y
13.		Olympus E-M10 III	Y	stereo / mono	-	-	micro	2.0	Y	-	-
14.		Olympus E-PL6	Y	stereo / mono	-	-	mini	2.0	-	-	-
15.		Olympus E-PL7	Y	stereo / mono	-	-	micro	2.0	Y	-	-
16.		Olympus E-PL8	Y	stereo / mono	-	-	micro	2.0	Y	-	-
17.		Olympus E-PL10	Y	stereo / mono	-	-	micro	2.0	Y	-	Y

It is notable that the E-PL9 offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the D100 does not provide wifi capability.

Both the D100 and the E-PL9 have been discontinued, but can regularly be found used on ebay. The D100 was replaced by the Nikon D200, while the E-PL9 was followed by the Olympus E-PL10. Further information on the features and operation of the D100 and E-PL9 can be found, respectively, in the Nikon D100 Manual (free pdf) or the online Olympus E-PL9 Manual.

Review summary

So what conclusions can be drawn? Which of the two cameras – the Nikon D100 or the Olympus E-PL9 – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.

Reasons to prefer the Nikon D100:

• Easier framing: Has an optical viewfinder for image composition and settings control.
• Easier setting verification: Features an LCD display on top to control shooting parameters.
• More heavily discounted: Has been available for much longer (launched in February 2002).

Arguments in favor of the Olympus PEN E-PL9:

• More detail: Has more megapixels (15.9 vs 6MP), which boosts linear resolution by 59%.
• Broader imaging potential: Can capture not only stills but also 4K/30p video.
• Larger screen: Has a bigger rear LCD (3.0" vs 1.8") for image review and settings control.
• More detailed LCD: Has a higher resolution rear screen (1040k vs 118k dots).
• More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
• Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
• More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
• Faster burst: Shoots at higher frequency (8.6 vs 3 flaps/sec) to capture the decisive moment.
• Less disturbing: Has an electronic shutter option for completely silent shooting.
• Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
• More compact: Is smaller (117x68mm vs 144x116mm) and will fit more readily into a bag.
• Less heavy: Has a lower weight (by 400g or 51 percent) and is thus easier to take along.
• Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
• More legacy lens friendly: Can use many non-native lenses via adapters.
• Faster data transfer: Supports a more advanced USB protocol (2.0 vs 1.1).
• Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
• Easier wireless transfer: Supports Bluetooth for image sharing without cables.
• More affordable: Was introduced into a lower priced category (70 percent cheaper at launch).
• More modern: Reflects 15 years and 11 months of technical progress since the D100 launch.

If the count of individual advantages (bullet points above) is taken as a guide, the E-PL9 is the clear winner of the contest (19 : 3 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision on a new camera. A professional wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

How about other alternatives? Do the specifications of the Nikon D100 and the Olympus E-PL9 place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it says little about, for example, the shooting experience and imaging performance of the D100 and the E-PL9 in practical situations. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is where reviews by experts come in. The following table reports the overall ratings of the cameras as published by some of the major camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

Expert Camera Reviews

		Camera   Model	AP   score	CL   score	DCW   score	DPR   score	EPZ   score	PB   score	Camera Launch	Launch Price	Street Price
1.		Nikon D100	..	..	..	+ +	o	..	Feb 2002	US$ 1 999	ebay.com
2.		Olympus E-PL9	..	+	..	..	4.5/5	4/5	Feb 2018	US$ 599	ebay.com
3.		Canon 10D	..	..	..	+ +	..	..	Feb 2003	US$ 1 999	ebay.com
4.		Nikon D40	..	81/100	..	+ +	o	4.5/5	Nov 2006	US$ 499	ebay.com
5.		Nikon D70	..	..	..	+ +	..	..	Jan 2004	US$ 999	ebay.com
6.		Nikon D70s	..	..	..	..	..	5/5	Apr 2005	US$ 899	ebay.com
7.		Nikon D80	..	+	..	+ +	o	4.5/5	Aug 2006	US$ 999	ebay.com
8.		Nikon D90	..	+ +	..	+ +	4/5	4.5/5	Aug 2008	US$ 1 299	ebay.com
9.		Nikon D200	..	+ +	..	+ +	o	..	Nov 2005	US$ 1 699	ebay.com
10.		Nikon D300	..	+ +	..	+ +	5/5	4.5/5	Aug 2007	US$ 1 799	ebay.com
11.		Nikon D300S	5/5	+ +	..	82/100	4/5	4.5/5	Jul 2009	US$ 1 799	ebay.com
12.		Nikon D500	5/5	+ +	4.7/5	91/100	4.5/5	5/5	Jan 2016	US$ 1 999	ebay.com
13.		Olympus E-M10 III	..	+	5/5	80/100	4.5/5	4.5/5	Aug 2017	US$ 649	ebay.com
14.		Olympus E-PL6	..	..	..	..	..	..	May 2013	US$ 599	ebay.com
15.		Olympus E-PL7	4/5	+	..	..	5/5	4/5	Aug 2014	US$ 599	ebay.com
16.		Olympus E-PL8	..	..	..	..	4.5/5	4/5	Sep 2016	US$ 549	ebay.com
17.		Olympus E-PL10	..	..	4/5	77/100	..	4/5	Oct 2019	US$ 599	ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The review scores listed above should be treated with care, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

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Other camera comparisons

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