Fujifilm X-A3 vs Sigma fp

The Fujifilm X-A3 and the Sigma fp are two digital cameras that were announced, respectively, in August 2016 and July 2019. Both the X-A3 and the fp are mirrorless interchangeable lens cameras that are based on an APS-C (X-A3) and a full frame (fp) sensor. Both cameras offer a resolution of 24 megapixels.

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

Headline Specifications

Fujifilm X-A3		Sigma fp
Mirrorless system camera		Mirrorless system camera
Fujifilm X mount lenses		Leica L mount lenses
24 MP – APS-C sensor		24 MP – Full Frame sensor
1080/60p Video		4K/30p Video
ISO 200-6,400 (100 - 25,600)		ISO 100-25,600 (6 - 102,400)
No viewfinder, LCD framing		Viewfinder optional
3.0" LCD – 1040k dots		3.2" LCD – 2100k dots
Tilting touchscreen		Fixed touchscreen
6 shutter flaps per second		12 shutter flaps per second
not weather sealed		Weathersealed body
410 shots per battery charge		280 shots per battery charge
117 x 67 x 40 mm, 339 g		113 x 70 x 45 mm, 422 g

Check X-A3 offers at
ebay.com
Check fp price at
amazon.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Fujifilm X-A3 and the Sigma fp? 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-A3 and the Sigma fp is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth dimensions are rounded to the nearest millimeter.

The X-A3 can be obtained in three different colors (silver, brown, pink), while the fp 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 Fujifilm X-A3 and the Sigma fp are of equal size. However, the fp is markedly heavier (24 percent) than the X-A3. It is noteworthy in this context that the fp is splash and dust-proof, while the X-A3 does not feature any corresponding weather-sealing.

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. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the X-A3 gets 410 shots out of its Fujifilm NP-W126S battery, while the fp can take 280 images on a single charge of its Sigma BP-51 power pack. The battery packs of both cameras can be charged via USB, which can be very convenient when travelling.

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 (USD)	Street Price
1.		Fujifilm X-A3	117 mm	67 mm	40 mm	339 g	410	n	Aug 2016	399	ebay.com
2.		Sigma fp	113 mm	70 mm	45 mm	422 g	280	Y	Jul 2019	1,899	amazon.com
3.		Fujifilm X-A1	117 mm	67 mm	39 mm	330 g	350	n	Sep 2013	399	ebay.com
4.		Fujifilm X-A2	117 mm	67 mm	40 mm	350 g	410	n	Jan 2015	399	ebay.com
5.		Fujifilm X-A5	117 mm	68 mm	40 mm	361 g	450	n	Jan 2018	399	ebay.com
6.		Fujifilm X-A7	119 mm	68 mm	41 mm	320 g	440	n	Sep 2019	499	ebay.com
7.		Fujifilm X-A10	117 mm	67 mm	40 mm	331 g	410	n	Dec 2016	399	ebay.com
8.		Fujifilm X-E3	121 mm	74 mm	43 mm	337 g	350	n	Sep 2017	899	ebay.com
9.		Fujifilm X-Pro3	141 mm	83 mm	46 mm	497 g	440	Y	Oct 2019	1,799	amazon.com
10.		Fujifilm X-T10	118 mm	83 mm	41 mm	381 g	350	n	May 2015	799	ebay.com
11.		Fujifilm X-T20	118 mm	83 mm	41 mm	383 g	350	n	Jan 2017	899	ebay.com
12.		Fujifilm X-T30	118 mm	83 mm	47 mm	383 g	380	n	Feb 2019	899	ebay.com
13.		Fujifilm X-T200	121 mm	84 mm	55 mm	370 g	270	n	Jan 2020	699	ebay.com
14.		Nikon D780	144 mm	116 mm	76 mm	840 g	2260	Y	Jan 2020	2,299	amazon.com
15.		Panasonic S1	149 mm	110 mm	97 mm	1017 g	400	Y	Feb 2019	2,499	amazon.com
16.		Panasonic S1H	151 mm	114 mm	110 mm	1052 g	400	Y	May 2019	3,999	amazon.com
17.		Panasonic S5	133 mm	98 mm	82 mm	714 g	440	Y	Sep 2020	1,999	amazon.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 X-A3 was launched at a markedly lower price (by 79 percent) than the fp, 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 imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Fujifilm X-A3 features an APS-C sensor and the Sigma fp a full frame sensor. The sensor area in the fp is 133 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Even though the fp has a larger sensor, both cameras offer the same resolution of 24 megapixels. This implies that the fp has a lower pixel density and larger individual pixels (with a pixel pitch of 5.98μm versus 3.92μm for the X-A3), which gives it a potential advantage in terms of light gathering capacity. In addition, the fp is much more recent (by 2 years and 10 months) than the X-A3, and its sensor will have benefitted from technological advances during this time. Coming back to sensor resolution, it should be mentioned that the fp has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The Fujifilm X-A3 has a native sensitivity range from ISO 200 to ISO 6400, which can be extended to ISO 100-25600. The corresponding ISO settings for the Sigma fp are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 6-102400.

In terms of underlying technology, the X-A3 is build around a CMOS sensor, while the fp uses a BSI-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.

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-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-A3	APS-C	24.0	6000	4000	1080/60p	23.8	13.1	1664	81
2.		Sigma fp	Full Frame	24.0	6000	4000	4K/30p	25.2	14.2	2829	94
3.		Fujifilm X-A1	APS-C	16.0	4896	3264	1080/30p	23.4	12.6	1390	76
4.		Fujifilm X-A2	APS-C	16.0	4896	3264	1080/30p	23.6	12.8	1515	79
5.		Fujifilm X-A5	APS-C	24.0	6000	4000	4K/15p	24.0	13.3	1800	82
6.		Fujifilm X-A7	APS-C	24.0	6000	4000	4K/30p	24.1	13.6	1955	84
7.		Fujifilm X-A10	APS-C	16.0	4896	3264	1080/30p	23.9	13.2	1691	81
8.		Fujifilm X-E3	APS-C	24.0	6000	4000	4K/30p	23.9	13.3	1764	82
9.		Fujifilm X-Pro3	APS-C	26.0	6240	4160	4K/30p	24.1	13.6	1968	84
10.		Fujifilm X-T10	APS-C	16.0	4896	3264	1080/60p	23.7	12.9	1546	79
11.		Fujifilm X-T20	APS-C	24.0	6000	4000	4K/30p	23.9	13.2	1704	81
12.		Fujifilm X-T30	APS-C	26.0	6240	4160	4K/30p	24.1	13.5	1895	83
13.		Fujifilm X-T200	APS-C	24.0	6000	4000	4K/30p	24.1	13.6	1991	84
14.		Nikon D780	Full Frame	24.3	6048	4024	4K/30p	25.3	14.3	2877	95
15.		Panasonic S1	Full Frame	24.0	6000	4000	4K/60p	25.2	14.5	3333	95
16.		Panasonic S1H	Full Frame	24.0	6000	4000	6K/30p	25.2	14.2	2805	94
17.		Panasonic S5	Full Frame	24.0	6000	4000	4K/60p	25.1	14.5	2697	94
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 fp provides a better video resolution than the X-A3. It can shoot movie footage at 4K/30p, while the Fujifilm is limited to 1080/60p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. The X-A3 and the fp are similar in the sense that neither of the two has a viewfinder. The images are, thus, framed using live view on the rear LCD. That said, the fp can be equipped with an optional viewfinder – the EVF-11. The adjacent table lists some of the other core features of the Fujifilm X-A3 and Sigma fp along with similar information for a selection of comparators.

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-A3	none	n	3.0 / 1040	tilting	Y	1/4000s	6.0/s	Y	n
2.		Sigma fp	optional	n	3.2 / 2100	fixed	Y	1/8000s	12.0/s	n	n
3.		Fujifilm X-A1	none	n	3.0 / 920	tilting	n	1/4000s	5.6/s	Y	n
4.		Fujifilm X-A2	none	n	3.0 / 920	tilting	n	1/4000s	5.6/s	Y	n
5.		Fujifilm X-A5	none	n	3.0 / 1040	tilting	Y	1/4000s	6.0/s	Y	n
6.		Fujifilm X-A7	none	n	3.5 / 2760	swivel	Y	1/4000s	6.0/s	Y	n
7.		Fujifilm X-A10	none	n	3.0 / 1040	tilting	n	1/4000s	6.0/s	Y	n
8.		Fujifilm X-E3	2360	n	3.0 / 1040	fixed	Y	1/4000s	8.0/s	n	n
9.		Fujifilm X-Pro3	3690	n	3.0 / 1620	tilting	Y	1/8000s	8.0/s	n	n
10.		Fujifilm X-T10	2360	n	3.0 / 920	tilting	n	1/4000s	8.0/s	Y	n
11.		Fujifilm X-T20	2360	n	3.0 / 1040	tilting	Y	1/4000s	8.0/s	Y	n
12.		Fujifilm X-T30	2360	n	3.0 / 1040	tilting	Y	1/4000s	8.0/s	Y	n
13.		Fujifilm X-T200	2360	n	3.5 / 2780	swivel	Y	1/4000s	8.0/s	Y	n
14.		Nikon D780	optical	Y	3.2 / 2359	tilting	Y	1/8000s	12.0/s	n	n
15.		Panasonic S1	5760	Y	3.2 / 2100	full-flex	Y	1/8000s	9.0/s	n	Y
16.		Panasonic S1H	5760	Y	3.2 / 2330	swivel	Y	1/8000s	9.0/s	n	Y
17.		Panasonic S5	2360	n	3.0 / 1840	swivel	Y	1/8000s	7.0/s	n	Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One difference between the cameras concerns the presence of an on-board flash. The X-A3 has one, while the fp does not. While the built-in flash of the X-A3 is not very powerful, it can at times be useful as a fill-in light.

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, both cameras under consideration feature an 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 Fujifilm X-A3 and the Sigma fp both have 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.

Concerning the storage of imaging data, both the X-A3 and the fp write their files to SDXC cards. The fp supports UHS-II cards (Ultra High Speed data transfer of up to 312 MB/s), while the X-A3 can use UHS-I cards (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-A3 and Sigma fp 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-A3	Y	stereo / mono	-	-	micro	2.0	Y	-	-
2.		Sigma fp	Y	stereo / mono	Y	-	micro	3.1	-	-	-
3.		Fujifilm X-A1	Y	stereo / mono	-	-	mini	2.0	Y	-	-
4.		Fujifilm X-A2	Y	stereo / mono	-	-	mini	2.0	Y	-	-
5.		Fujifilm X-A5	Y	stereo / mono	Y	-	micro	2.0	Y	-	Y
6.		Fujifilm X-A7	Y	stereo / mono	Y	-	micro	2.0	Y	-	Y
7.		Fujifilm X-A10	-	stereo / mono	-	-	micro	2.0	Y	-	-
8.		Fujifilm X-E3	Y	stereo / mono	Y	-	micro	2.0	Y	-	Y
9.		Fujifilm X-Pro3	Y	stereo / mono	Y	-	-	3.1	Y	-	Y
10.		Fujifilm X-T10	Y	stereo / mono	Y	-	micro	2.0	Y	-	-
11.		Fujifilm X-T20	Y	stereo / mono	Y	-	micro	2.0	Y	-	-
12.		Fujifilm X-T30	Y	stereo / mono	Y	-	micro	3.1	Y	-	Y
13.		Fujifilm X-T200	Y	stereo / mono	Y	Y	micro	3.1	Y	-	Y
14.		Nikon D780	Y	stereo / mono	Y	Y	mini	3.1	Y	-	Y
15.		Panasonic S1	Y	stereo / mono	Y	Y	full	3.1	Y	-	Y
16.		Panasonic S1H	Y	stereo / mono	Y	Y	full	3.1	Y	-	Y
17.		Panasonic S5	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y

It is notable that the X-A3 offers wifi support, while the fp does not. Wifi can be a very convenient means to transfer image data to an off-camera location.

The fp is a recent model that features in the current product line-up of Sigma. In contrast, the X-A3 has been discontinued (but can be found pre-owned on ebay). As a replacement in the same line of cameras, the X-A3 was succeeded by the Fujifilm X-A5. Further information on the features and operation of the X-A3 and fp can be found, respectively, in the Fujifilm X-A3 Manual (free pdf) or the online Sigma fp Manual.

Review summary

So how do things add up? Which of the two cameras – the Fujifilm X-A3 or the Sigma fp – has the upper hand? Is one clearly better than the other? A synthesis of the relative strong points of each of the models is listed below.

Advantages of the Fujifilm X-A3:

• Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
• 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.
• Less heavy: Is lighter (by 83g or 20 percent) and hence easier to carry around.
• Longer lasting: Can take more shots (410 versus 280) on a single battery charge.
• Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
• Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
• More affordable: Was introduced into a lower priced category (79 percent cheaper at launch).
• More heavily discounted: Has been available for much longer (launched in August 2016).

Arguments in favor of the Sigma fp:

• Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
• Better image quality: Is equipped with a larger and more technologically advanced sensor.
• Richer colors: The sensor size advantage translates into images with better, more accurate colors.
• More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
• Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
• Better video: Provides higher definition movie capture (4K/30p vs 1080/60p).
• Better sound: Can connect to an external microphone for higher quality sound recording.
• More framing options: Can be equipped with a hotshoe-mounted accessory-viewfinder.
• Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
• More detailed LCD: Has a higher resolution rear screen (2100k vs 1040k dots).
• Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
• Faster burst: Shoots at higher frequency (12 vs 6 flaps/sec) to capture the decisive moment.
• Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
• Faster data transfer: Supports a more advanced USB protocol (3.1 vs 2.0).
• Faster buffer clearing: Supports a more advanced SD data transfer standard (UHS-II vs UHS-I).
• More modern: Reflects 2 years and 10 months of technical progress since the X-A3 launch.

If the count of relative strengths (bullet points above) is taken as a measure, the fp is the clear winner of the contest (16 : 9 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape 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-A3 and the Sigma fp place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera listing 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-A3 or the fp perform in practice. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.

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 (USD)	Street Price
1.		Fujifilm X-A3	..	..	..	74/100	4.5/5	4/5	Aug 2016	399	ebay.com
2.		Sigma fp	4/5	..	4/5	..	4/5	4.5/5	Jul 2019	1,899	amazon.com
3.		Fujifilm X-A1	..	..	..	..	4.5/5	4.5/5	Sep 2013	399	ebay.com
4.		Fujifilm X-A2	4/5	..	..	..	4.5/5	4.5/5	Jan 2015	399	ebay.com
5.		Fujifilm X-A5	..	+	4.1/5	..	4/5	3.5/5	Jan 2018	399	ebay.com
6.		Fujifilm X-A7	3/5	..	3.5/5	81/100	4/5	3.5/5	Sep 2019	499	ebay.com
7.		Fujifilm X-A10	..	..	..	..	4/5	4/5	Dec 2016	399	ebay.com
8.		Fujifilm X-E3	4.5/5	+	4.5/5	84/100	4.5/5	4.5/5	Sep 2017	899	ebay.com
9.		Fujifilm X-Pro3	4/5	+	4/5	85/100	4/5	..	Oct 2019	1,799	amazon.com
10.		Fujifilm X-T10	4.5/5	+ +	..	80/100	5/5	5/5	May 2015	799	ebay.com
11.		Fujifilm X-T20	5/5	+ +	5/5	82/100	5/5	4.5/5	Jan 2017	899	ebay.com
12.		Fujifilm X-T30	5/5	+ +	5/5	84/100	4.5/5	4.5/5	Feb 2019	899	ebay.com
13.		Fujifilm X-T200	3.5/5	..	4/5	82/100	4/5	4.5/5	Jan 2020	699	ebay.com
14.		Nikon D780	5/5	..	5/5	87/100	4.5/5	4.5/5	Jan 2020	2,299	amazon.com
15.		Panasonic S1	4.5/5	+ +	4.5/5	88/100	4.5/5	4/5	Feb 2019	2,499	amazon.com
16.		Panasonic S1H	..	..	4/5	90/100	..	..	May 2019	3,999	amazon.com
17.		Panasonic S5	4.5/5	+ +	4.5/5	88/100	4.5/5	4.5/5	Sep 2020	1,999	amazon.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, 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

Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just make a corresponding selection in the search boxes below. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

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