Fujifilm X-A1 vs X100S

The Fujifilm X-A1 and the Fujifilm X100S are two digital cameras that were officially introduced, respectively, in September 2013 and January 2013. The X-A1 is a mirrorless interchangeable lens camera, while the X100S is a fixed lens compact. Both cameras are equipped with an APS-C sensor. Both cameras offer a resolution of 16 megapixels.

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

Headline Specifications

Fujifilm X-A1		Fujifilm X100S
Mirrorless system camera		Fixed lens compact camera
Fujifilm X mount lenses		35mm f/2.0
16 MP – APS-C sensor		16 MP – APS-C sensor
1080/30p Video		1080/60p Video
ISO 200-6,400 (100 - 25,600)		ISO 200-6,400 (100 - 25,600)
No viewfinder, LCD framing		Electronic viewfinder (2360k dots)
3.0" LCD – 920k dots		2.8" LCD – 460k dots
Tilting screen (no touchscreen)		Fixed screen (not touch-sensitive)
5.6 shutter flaps per second		6 shutter flaps per second
350 shots per battery charge		330 shots per battery charge
117 x 67 x 39 mm, 330 g		127 x 74 x 54 mm, 445 g

Check X-A1 offers at
ebay.com
Check X100S offers at
ebay.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Fujifilm X-A1 and the Fujifilm X100S? 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 Fujifilm X-A1 and the Fujifilm X100S 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 measures are rounded to the nearest millimeter.

The X-A1 can be obtained in two different colors (black, blue), while the X100S is also available in two color-versions, but different ones (black, silver).

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Fujifilm X100S is notably larger (20 percent) than the Fujifilm X-A1. In this context, it is worth noting that neither the X-A1 nor the X100S are weather-sealed.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the X100S has a lens built in, whereas the X-A1 is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup. You can compare the optics available for the X-A1 and their specifications in the Fujinon X Lens Catalog.

Concerning battery life, the X-A1 gets 350 shots out of its Fujifilm NP-W126 battery, while the X100S can take 330 images on a single charge of its Fujifilm NP-95 power pack.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

Body Specifications

		Camera Model	Camera Width	Camera Height	Camera Depth	Camera Weight	Battery Life	Weather Sealing	Camera Launch	Launch Price	Street Price
1.		Fujifilm X-A1	117 mm	67 mm	39 mm	330 g	350	n	Sep 2013	US$ 399	ebay.com
2.		Fujifilm X100S	127 mm	74 mm	54 mm	445 g	330	n	Jan 2013	US$ 1 299	ebay.com
3.		Fujifilm X-A2	117 mm	67 mm	40 mm	350 g	410	n	Jan 2015	US$ 399	ebay.com
4.		Fujifilm X-A3	117 mm	67 mm	40 mm	339 g	410	n	Aug 2016	US$ 399	ebay.com
5.		Fujifilm X-A5	117 mm	68 mm	40 mm	361 g	450	n	Jan 2018	US$ 399	ebay.com
6.		Fujifilm X-A10	117 mm	67 mm	40 mm	331 g	410	n	Dec 2016	US$ 399	ebay.com
7.		Fujifilm X-E1	129 mm	75 mm	38 mm	350 g	350	n	Sep 2012	US$ 999	ebay.com
8.		Fujifilm X-E2	129 mm	75 mm	37 mm	350 g	350	n	Oct 2013	US$ 999	ebay.com
9.		Fujifilm X-E2S	129 mm	75 mm	37 mm	350 g	350	n	Jan 2016	US$ 699	ebay.com
10.		Fujifilm X-M1	117 mm	67 mm	39 mm	330 g	350	n	Jun 2013	US$ 699	ebay.com
11.		Fujifilm X-Pro1	140 mm	82 mm	43 mm	450 g	300	n	Jan 2012	US$ 1 699	ebay.com
12.		Fujifilm X-T10	118 mm	83 mm	41 mm	381 g	350	n	May 2015	US$ 799	ebay.com
13.		Fujifilm X30	119 mm	72 mm	60 mm	423 g	470	n	Aug 2014	US$ 599	ebay.com
14.		Fujifilm X100	126 mm	75 mm	54 mm	445 g	300	n	Sep 2010	US$ 1 199	ebay.com
15.		Fujifilm X100T	127 mm	74 mm	52 mm	440 g	330	n	Sep 2014	US$ 1 299	ebay.com
16.		Fujifilm X100F	127 mm	75 mm	52 mm	469 g	390	n	Jan 2017	US$ 1 299	ebay.com
17.		Leica X Typ 113	133 mm	73 mm	78 mm	486 g	350	n	Sep 2014	US$ 2 299	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 obviously take relative prices into account. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. 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 imaging sensor is a crucial determinant of image quality. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixels in a sensor of the same technological generation. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Both cameras under consideration feature an APS-C sensor, but their sensors differ slightly in size. They nevertheless have the same format factor of 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Even though the X-A1 has a slightly larger sensor, both cameras offer the same resolution of 16 megapixels. This implies that the X-A1 has a lower pixel density and larger individual pixels (with a pixel pitch of 4.80μm versus 4.80μm for the X100S), which gives it a potential advantage in terms of light gathering capacity. In addition, the X-A1 is a somewhat more recent model (by 8 months) than the X100S, and its sensor might have benefitted from technological advances during this time. Coming back to sensor resolution, it should be mentioned that the X100S has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The X100S has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Fujifilm X-A1 has a native sensitivity range from ISO 200 to ISO 6400, which can be extended to ISO 100-25600. The Fujifilm X100S offers exactly the same ISO settings.

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Like most digital cameras, the X-A1 uses a Bayer filter for capturing RGB colors on a square grid of photosensors. In contrast, the X100S employs a more randomized X-Trans layout of photosites, which according to Fujifilm helps to minimize moiré.

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

Sensor Characteristics

		Camera Model	Sensor Class	Resolution (MP)	Horiz. Pixels	Vert. Pixels	Video Format	DXO Portrait	DXO Landscape	DXO Sports	DXO Overall
1.		Fujifilm X-A1	APS-C	16.0	4896	3264	1080/30p	23.4	12.6	1390	76
2.		Fujifilm X100S	APS-C	16.0	4896	3264	1080/60p	23.3	12.5	1329	75
3.		Fujifilm X-A2	APS-C	16.0	4896	3264	1080/30p	23.6	12.8	1515	79
4.		Fujifilm X-A3	APS-C	24.0	6000	4000	1080/60p	23.8	13.1	1664	81
5.		Fujifilm X-A5	APS-C	24.0	6000	4000	4K/15p	24.0	13.3	1800	82
6.		Fujifilm X-A10	APS-C	16.0	4896	3264	1080/30p	23.9	13.2	1691	81
7.		Fujifilm X-E1	APS-C	16.0	4896	3264	1080/24p	23.2	12.4	1298	75
8.		Fujifilm X-E2	APS-C	16.0	4896	3264	1080/60p	23.4	12.6	1400	77
9.		Fujifilm X-E2S	APS-C	16.0	4896	3264	1080/60p	23.7	13.0	1608	80
10.		Fujifilm X-M1	APS-C	16.0	4896	3264	1080/30p	23.4	12.6	1371	76
11.		Fujifilm X-Pro1	APS-C	16.0	4896	3264	1080/24p	23.1	12.3	1238	74
12.		Fujifilm X-T10	APS-C	16.0	4896	3264	1080/60p	23.7	12.9	1546	79
13.		Fujifilm X30	2/3	12.0	4000	3000	1080/60p	20.4	11.2	-312	49
14.		Fujifilm X100	APS-C	12.2	4288	2848	720/30p	22.9	12.4	1001	73
15.		Fujifilm X100T	APS-C	16.0	4896	3264	1080/60p	23.6	12.8	1483	78
16.		Fujifilm X100F	APS-C	24.0	6000	4000	1080/60p	23.9	13.2	1704	81
17.		Leica X Typ 113	APS-C	16.1	4928	3264	1080/30p	23.6	12.8	1491	78
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. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the X100S provides a faster frame rate than the X-A1. It can shoot movie footage at 1080/60p, while the X-A1 is limited to 1080/30p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the X100S has an electronic viewfinder (2360k dots), which can be very helpful when shooting in bright sunlight. In contrast, the X-A1 relies on live view and the rear LCD for framing. The table below summarizes some of the other core capabilities of the Fujifilm X-A1 and Fujifilm X100S in connection with corresponding information for a sample of similar 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.		Fujifilm X-A1	none	n	3.0 / 920	tilting	n	1/4000s	5.6/s	Y	n
2.		Fujifilm X100S	2360	n	2.8 / 460	fixed	n	1/4000s	6.0/s	Y	n
3.		Fujifilm X-A2	none	n	3.0 / 920	tilting	n	1/4000s	5.6/s	Y	n
4.		Fujifilm X-A3	none	n	3.0 / 1040	tilting	Y	1/4000s	6.0/s	Y	n
5.		Fujifilm X-A5	none	n	3.0 / 1040	tilting	Y	1/4000s	6.0/s	Y	n
6.		Fujifilm X-A10	none	n	3.0 / 1040	tilting	n	1/4000s	6.0/s	Y	n
7.		Fujifilm X-E1	2360	n	2.8 / 460	fixed	n	1/4000s	6.0/s	Y	n
8.		Fujifilm X-E2	2360	n	3.0 / 1040	fixed	n	1/4000s	7.0/s	Y	n
9.		Fujifilm X-E2S	2360	n	3.0 / 1040	fixed	n	1/4000s	7.0/s	Y	n
10.		Fujifilm X-M1	none	n	3.0 / 920	tilting	n	1/4000s	5.6/s	Y	n
11.		Fujifilm X-Pro1	1440	n	3.0 / 1230	fixed	n	1/4000s	6.0/s	n	n
12.		Fujifilm X-T10	2360	n	3.0 / 920	tilting	n	1/4000s	8.0/s	Y	n
13.		Fujifilm X30	2360	n	3.0 / 920	tilting	n	1/4000s	12.0/s	Y	Y
14.		Fujifilm X100	1440	n	2.8 / 460	fixed	n	1/4000s	5.0/s	Y	n
15.		Fujifilm X100T	2360	n	3.0 / 1040	fixed	n	1/4000s	6.0/s	Y	n
16.		Fujifilm X100F	2360	n	3.0 / 1040	fixed	n	1/4000s	8.0/s	Y	n
17.		Leica X Typ 113	optional	n	3.0 / 920	fixed	n	1/2000s	5.0/s	Y	n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

The X-A1 writes its imaging data to SDHC cards, while the X100S uses SDXC cards. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

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 Fujifilm X-A1 and Fujifilm X100S 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.		Fujifilm X-A1	Y	stereo / mono	-	-	mini	2.0	Y	-	-
2.		Fujifilm X100S	Y	stereo / mono	-	-	micro	2.0	-	-	-
3.		Fujifilm X-A2	Y	stereo / mono	-	-	mini	2.0	Y	-	-
4.		Fujifilm X-A3	Y	stereo / mono	-	-	micro	2.0	Y	-	-
5.		Fujifilm X-A5	Y	stereo / mono	Y	-	micro	2.0	Y	-	Y
6.		Fujifilm X-A10	-	stereo / mono	-	-	micro	2.0	Y	-	-
7.		Fujifilm X-E1	Y	stereo / mono	Y	-	mini	2.0	-	-	-
8.		Fujifilm X-E2	Y	stereo / mono	Y	-	micro	2.0	Y	-	-
9.		Fujifilm X-E2S	Y	stereo / mono	Y	-	micro	2.0	Y	-	-
10.		Fujifilm X-M1	Y	stereo / mono	-	-	mini	2.0	Y	-	-
11.		Fujifilm X-Pro1	Y	stereo / mono	-	-	mini	2.0	-	-	-
12.		Fujifilm X-T10	Y	stereo / mono	Y	-	micro	2.0	Y	-	-
13.		Fujifilm X30	Y	stereo / mono	-	-	micro	2.0	Y	-	-
14.		Fujifilm X100	Y	stereo / -	-	-	mini	2.0	-	-	-
15.		Fujifilm X100T	Y	stereo / mono	Y	-	micro	2.0	Y	-	-
16.		Fujifilm X100F	Y	stereo / mono	Y	-	micro	2.0	Y	-	-
17.		Leica X Typ 113	Y	stereo / mono	-	-	mini	2.0	-	-	-

It is notable that the X-A1 offers wifi support, while the X100S does not. Wifi can be a very convenient means to transfer image data to an off-camera location.

Both the X-A1 and the X100S have been discontinued, but can regularly be found used on ebay. The X100S was replaced by the Fujifilm X100T, while the X-A1 was followed by the Fujifilm X-A2. Further information on the features and operation of the X-A1 and X100S can be found, respectively, in the Fujifilm X-A1 Manual (free pdf) or the online Fujifilm X100S Manual.

Review summary

So what is the bottom line? Which of the two cameras – the Fujifilm X-A1 or the Fujifilm X100S – 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 Fujifilm X-A1:

• Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
• Larger screen: Has a bigger rear LCD (3.0" vs 2.8") for image review and settings control.
• More detailed LCD: Has a higher resolution rear screen (920k vs 460k dots).
• More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
• More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
• More flexible: Accepts interchangeable lenses, so that lens characteristics can be altered.
• More compact: Is smaller (117x67mm vs 127x74mm) and thus needs less room in the bag.
• Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
• More modern: Is somewhat more recent (announced 8 months after the X100S).

Advantages of the Fujifilm X100S:

• Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
• Better video: Provides higher movie framerates (1080/60p versus 1080/30p).
• Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
• Easier framing: Has an electronic viewfinder for image composition and settings control.
• Ready to shoot: Has an integrated lens, whereas the X-A1 necessitates an extra lens.
• More heavily discounted: Has been on the market for longer (launched in January 2013).

If the count of individual advantages (bullet points above) is taken as a guide, the X-A1 emerges as the winner of the contest (9 : 6 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 Fujifilm X-A1 and the Fujifilm X100S place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best Prime Lens Compact Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains incomplete and does no justice, for example, to the way the X-A1 or the X100S perform in practice. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.

Expert reviews

This is why expert reviews are important. The adjacent summary-table relays the overall verdicts of several of the most popular 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.		Fujifilm X-A1	..	..	..	..	4.5/5	4.5/5	Sep 2013	US$ 399	ebay.com
2.		Fujifilm X100S	5/5	+ +	..	81/100	4.5/5	5/5	Jan 2013	US$ 1 299	ebay.com
3.		Fujifilm X-A2	4/5	..	..	..	4.5/5	4.5/5	Jan 2015	US$ 399	ebay.com
4.		Fujifilm X-A3	..	..	..	74/100	4.5/5	4/5	Aug 2016	US$ 399	ebay.com
5.		Fujifilm X-A5	..	+	4.1/5	..	4/5	3.5/5	Jan 2018	US$ 399	ebay.com
6.		Fujifilm X-A10	..	..	..	..	4/5	4/5	Dec 2016	US$ 399	ebay.com
7.		Fujifilm X-E1	4/5	+ +	..	79/100	4.5/5	4.5/5	Sep 2012	US$ 999	ebay.com
8.		Fujifilm X-E2	4/5	..	..	80/100	4.5/5	5/5	Oct 2013	US$ 999	ebay.com
9.		Fujifilm X-E2S	4.5/5	..	..	77/100	4.5/5	4.5/5	Jan 2016	US$ 699	ebay.com
10.		Fujifilm X-M1	3/5	+	..	77/100	4.5/5	4.5/5	Jun 2013	US$ 699	ebay.com
11.		Fujifilm X-Pro1	5/5	+ +	..	79/100	4.5/5	4.5/5	Jan 2012	US$ 1 699	ebay.com
12.		Fujifilm X-T10	4.5/5	+ +	..	80/100	5/5	5/5	May 2015	US$ 799	ebay.com
13.		Fujifilm X30	4/5	..	..	76/100	4.5/5	4.5/5	Aug 2014	US$ 599	ebay.com
14.		Fujifilm X100	3/5	..	..	75/100	4/5	5/5	Sep 2010	US$ 1 199	ebay.com
15.		Fujifilm X100T	5/5	+	..	81/100	4.5/5	5/5	Sep 2014	US$ 1 299	ebay.com
16.		Fujifilm X100F	5/5	+	3.9/5	83/100	4.5/5	4.5/5	Jan 2017	US$ 1 299	ebay.com
17.		Leica X Typ 113	3.5/5	..	..	..	3.5/5	4/5	Sep 2014	US$ 2 299	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. Hence, a score should always be seen in the context of the camera's market launch date and its price, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

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Other camera comparisons

Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just make your choice using the following search menu. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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