Olympus E-PM1 vs Panasonic G3

The Olympus PEN E-PM1 and the Panasonic Lumix DMC-G3 are two digital cameras that were officially introduced, respectively, in June 2011 and May 2011. Both the E-PM1 and the G3 are mirrorless interchangeable lens cameras that are equipped with a Four Thirds sensor. The Olympus has a resolution of 12.2 megapixels, whereas the Panasonic provides 15.8 MP.

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

Headline Specifications

Olympus E-PM1		Panasonic G3
Mirrorless system camera		Mirrorless system camera
Micro Four Thirds lenses		Micro Four Thirds lenses
12.2 MP – Four Thirds sensor		15.8 MP – Four Thirds sensor
1080/60i Video		1080/60i Video
ISO 100-12,800		ISO 160-6,400
Viewfinder optional		Electronic viewfinder (1440k dots)
3.0" LCD – 460k dots		3.0" LCD – 460k dots
Fixed screen (not touch-sensitive)		Swivel touchscreen
5.5 shutter flaps per second		4 shutter flaps per second
In-body stabilization		Lens stabilization only
330 shots per battery charge		270 shots per battery charge
110 x 64 x 34 mm, 265 g		115 x 84 x 47 mm, 336 g

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Going beyond this snapshot of core features and characteristics, what are the differences between the Olympus PEN E-PM1 and the Panasonic Lumix DMC-G3? 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

The physical size and weight of the Olympus E-PM1 and the Panasonic G3 are illustrated in the side-by-side display below. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All width, height and depth measures are rounded to the nearest millimeter.

The E-PM1 can be obtained in six different colors (black, silver, brown, pink, purple, white), while the G3 is available in four color-versions (black, brown, red, white).

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Panasonic G3 is notably larger (37 percent) than the Olympus E-PM1. Moreover, the G3 is markedly heavier (27 percent) than the E-PM1. In this context, it is worth noting that neither the E-PM1 nor the G3 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. In this particular case, both cameras feature the same lens mount, so that they can use the same lenses. You can compare the optics available in the Micro Four Thirds Lens Catalog. Mirrorless cameras, such as the two under consideration, have the additional advantage of having a short flange to focal plane distance, which makes it possible to mount many lenses from other systems onto the camera via adapters.

Concerning battery life, the E-PM1 gets 330 shots out of its Olympus BLS-5 battery, while the G3 can take 270 images on a single charge of its Panasonic DMW-BLD10 power pack.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.

Body Specifications

		Camera Model	Camera Width	Camera Height	Camera Depth	Camera Weight	Battery Life	Weather Sealing	Camera Launch	Launch Price	Street Price
1.		Olympus E-PM1	110 mm	64 mm	34 mm	265 g	330	n	Jun 2011	US$ 499	ebay.com
2.		Panasonic G3	115 mm	84 mm	47 mm	336 g	270	n	May 2011	US$ 599	ebay.com
3.		Olympus E-P3	122 mm	69 mm	34 mm	369 g	330	n	Jun 2011	US$ 799	ebay.com
4.		Olympus E-PL1	115 mm	72 mm	42 mm	334 g	290	n	Feb 2010	US$ 599	ebay.com
5.		Olympus E-PL2	114 mm	72 mm	42 mm	362 g	280	n	Jan 2011	US$ 599	ebay.com
6.		Olympus E-PL3	110 mm	64 mm	37 mm	313 g	300	n	Jun 2011	US$ 599	ebay.com
7.		Olympus E-PL5	111 mm	64 mm	38 mm	325 g	360	n	Sep 2012	US$ 599	ebay.com
8.		Olympus E-PM2	110 mm	64 mm	34 mm	269 g	360	n	Sep 2012	US$ 499	ebay.com
9.		Panasonic G2	124 mm	84 mm	74 mm	428 g	360	n	Mar 2010	US$ 599	ebay.com
10.		Panasonic G5	120 mm	83 mm	71 mm	396 g	320	n	Jul 2012	US$ 599	ebay.com
11.		Panasonic G6	122 mm	85 mm	71 mm	390 g	340	n	Apr 2013	US$ 599	ebay.com
12.		Panasonic GF2	113 mm	68 mm	33 mm	310 g	300	n	Nov 2010	US$ 549	ebay.com
13.		Panasonic GF3	108 mm	67 mm	32 mm	264 g	300	n	Jun 2011	US$ 549	ebay.com
14.		Panasonic GF5	108 mm	67 mm	37 mm	267 g	360	n	Apr 2012	US$ 499	ebay.com
15.		Panasonic GH2	124 mm	90 mm	76 mm	442 g	330	n	Sep 2010	US$ 899	ebay.com
16.		Panasonic GX1	116 mm	68 mm	39 mm	318 g	320	n	Nov 2011	US$ 699	ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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The price is, of course, an important factor in any camera decision. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The E-PM1 was launched at a somewhat lower price (by 17 percent) than the G3, which makes it more attractive for photographers on a tight budget. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. 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.

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 a Four Thirds sensor and have a format factor (sometimes also referred to as "crop factor") of 2.0. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

While the two cameras under review share the same sensor size, the G3 offers a higher resolution of 15.8 megapixels, compared with 12.2 MP of the E-PM1. This megapixels advantage translates into a 14 percent gain in linear resolution. On the other hand, these sensor specs imply that the G3 has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.77μm versus 4.29μm for the E-PM1). It is noteworthy in this context that the two cameras were released in close succession, so that their sensors are from the same technological generation.

The resolution advantage of the Panasonic G3 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the G3 for good quality output (200 dots per inch) amounts to 23 x 17.2 inches or 58.3 x 43.8 cm, for very good quality (250 dpi) 18.4 x 13.8 inches or 46.7 x 35 cm, and for excellent quality (300 dpi) 15.3 x 11.5 inches or 38.9 x 29.2 cm. The corresponding values for the Olympus E-PM1 are 20.2 x 15.1 inches or 51.2 x 38.4 cm for good quality, 16.1 x 12.1 inches or 41 x 30.7 cm for very good quality, and 13.4 x 10.1 inches or 34.1 x 25.6 cm for excellent quality prints.

The Olympus PEN E-PM1 has a native sensitivity range from ISO 100 to ISO 12800. The corresponding ISO settings for the Panasonic Lumix DMC-G3 are ISO 160 to ISO 6400 (no boost).

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

For many cameras, data on sensor performance has been reported by DXO Mark. 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"). Of the two cameras under consideration, the G3 has a markedly higher DXO score than the E-PM1 (overall score 4 points higher), which will translate into better image quality. 0.3 EV in additional dynamic range, and 0.4 stops in additional low light sensitivity. 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.		Olympus E-PM1	Four Thirds	12.2	4032	3024	1080/60i	21.0	10.3	499	52
2.		Panasonic G3	Four Thirds	15.8	4592	3448	1080/60i	21.0	10.6	667	56
3.		Olympus E-P3	Four Thirds	12.2	4032	3024	1080/60i	20.8	10.1	536	51
4.		Olympus E-PL1	Four Thirds	12.2	4032	3024	720/30p	21.5	10.1	487	54
5.		Olympus E-PL2	Four Thirds	12.2	4032	3024	720/30p	21.4	10.2	573	55
6.		Olympus E-PL3	Four Thirds	12.2	4032	3024	1080/60i	20.9	10.3	499	52
7.		Olympus E-PL5	Four Thirds	15.9	4608	3456	1080/30p	22.8	12.3	889	72
8.		Olympus E-PM2	Four Thirds	15.9	4608	3456	1080/30p	22.7	12.2	932	72
9.		Panasonic G2	Four Thirds	12.0	4000	3000	720/30p	21.2	10.3	493	53
10.		Panasonic G5	Four Thirds	15.9	4608	3456	1080/60p	21.4	11.6	618	61
11.		Panasonic G6	Four Thirds	15.9	4608	3456	1080/60p	21.3	11.5	639	61
12.		Panasonic GF2	Four Thirds	12.0	4000	3000	1080/60i	21.2	10.3	506	54
13.		Panasonic GF3	Four Thirds	12.0	4000	3000	1080/60i	20.6	10.1	459	50
14.		Panasonic GF5	Four Thirds	12.0	4000	3000	1080/60i	20.5	10.0	573	50
15.		Panasonic GH2	Four Thirds	15.9	4608	3456	1080/60i	21.2	11.3	655	60
16.		Panasonic GX1	Four Thirds	15.8	4592	3448	1080/60p	20.8	10.6	703	55

Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, and both provide the same movie specifications (1080/60i).

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the G3 has an electronic viewfinder (1440k dots), which can be very helpful when shooting in bright sunlight. In contrast, the E-PM1 relies on live view and the rear LCD for framing. That said, the E-PM1 can be equipped with an optional viewfinder – the VF-2. The following table reports on some other key feature differences and similarities of the Olympus E-PM1, the Panasonic G3, 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.		Olympus E-PM1	optional	n	3.0 / 460	fixed	n	1/4000s	5.5/s	n	Y
2.		Panasonic G3	1440	n	3.0 / 460	swivel	Y	1/4000s	4.0/s	Y	n
3.		Olympus E-P3	optional	n	3.0 / 614	fixed	Y	1/4000s	3.0/s	Y	Y
4.		Olympus E-PL1	optional	n	2.7 / 230	fixed	n	1/2000s	3.0/s	Y	Y
5.		Olympus E-PL2	optional	n	3.0 / 460	fixed	n	1/4000s	3.0/s	Y	Y
6.		Olympus E-PL3	optional	n	3.0 / 460	tilting	n	1/4000s	5.5/s	n	Y
7.		Olympus E-PL5	optional	n	3.0 / 460	tilting	Y	1/4000s	8.0/s	n	Y
8.		Olympus E-PM2	optional	n	3.0 / 460	fixed	Y	1/4000s	8.0/s	n	Y
9.		Panasonic G2	1440	n	3.0 / 460	swivel	Y	1/4000s	2.6/s	Y	n
10.		Panasonic G5	1440	n	3.0 / 920	swivel	Y	1/4000s	6.0/s	Y	n
11.		Panasonic G6	1440	n	3.0 / 1036	swivel	Y	1/4000s	7.0/s	Y	n
12.		Panasonic GF2	optional	n	3.0 / 460	fixed	Y	1/4000s	2.6/s	Y	n
13.		Panasonic GF3	none	n	3.0 / 460	fixed	Y	1/4000s	3.2/s	Y	n
14.		Panasonic GF5	none	n	3.0 / 920	fixed	Y	1/4000s	4.0/s	Y	n
15.		Panasonic GH2	1534	n	3.0 / 460	swivel	n	1/4000s	3.0/s	Y	n
16.		Panasonic GX1	optional	n	3.0 / 460	fixed	Y	1/4000s	4.2/s	Y	n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that differentiates the E-PM1 and the G3 is in-body image stabilization (IBIS). The E-PM1 reduces the risk of handshake-induced blur with all attached lenses, while the G3 offers no blur reduction with lenses that themselves do not provide optical image stabilization.

Concerning the storage of imaging data, both the E-PM1 and the G3 write their files to 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 Olympus PEN E-PM1 and Panasonic Lumix DMC-G3 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.		Olympus E-PM1	Y	stereo / mono	-	-	mini	2.0	-	-	-
2.		Panasonic G3	Y	stereo / mono	-	-	mini	2.0	-	-	-
3.		Olympus E-P3	Y	stereo / -	-	-	mini	2.0	-	-	-
4.		Olympus E-PL1	Y	stereo / -	-	-	mini	2.0	-	-	-
5.		Olympus E-PL2	Y	stereo / -	-	-	mini	2.0	-	-	-
6.		Olympus E-PL3	Y	stereo / -	-	-	mini	2.0	-	-	-
7.		Olympus E-PL5	Y	stereo / mono	-	-	mini	2.0	-	-	-
8.		Olympus E-PM2	Y	stereo / mono	-	-	mini	2.0	-	-	-
9.		Panasonic G2	Y	stereo / mono	-	-	mini	2.0	-	-	-
10.		Panasonic G5	Y	stereo / mono	-	-	mini	2.0	-	-	-
11.		Panasonic G6	Y	stereo / mono	Y	-	mini	2.0	Y	Y	-
12.		Panasonic GF2	Y	stereo / mono	-	-	mini	2.0	-	-	-
13.		Panasonic GF3	-	stereo / mono	-	-	mini	2.0	-	-	-
14.		Panasonic GF5	-	stereo / mono	-	-	mini	2.0	-	-	-
15.		Panasonic GH2	Y	stereo / mono	Y	-	mini	2.0	-	-	-
16.		Panasonic GX1	Y	stereo / mono	-	-	mini	2.0	-	-	-

Both the E-PM1 and the G3 have been discontinued, but can regularly be found used on ebay. The G3 was replaced by the Panasonic G5, while the E-PM1 was followed by the Olympus E-PM2. Further information on the features and operation of the E-PM1 and G3 can be found, respectively, in the Olympus E-PM1 Manual (free pdf) or the online Panasonic G3 Manual.

Review summary

So how do things add up? Which of the two cameras – the Olympus E-PM1 or the Panasonic G3 – 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 Olympus PEN E-PM1:

• Faster burst: Shoots at higher frequency (5.5 vs 4 flaps/sec) to capture the decisive moment.
• More compact: Is smaller (110x64mm vs 115x84mm) and thus needs less room in the bag.
• Less heavy: Is lighter (by 71g or 21 percent) and hence easier to carry around.
• Longer lasting: Can take more shots (330 versus 270) on a single battery charge.
• Sharper images: Has hand-shake reducing image stabilization built-in.
• More affordable: Was introduced into a lower priced segment (17 percent cheaper at launch).

Arguments in favor of the Panasonic Lumix DMC-G3:

• More detail: Has more megapixels (15.8 vs 12.2MP), which boosts linear resolution by 14%.
• Better image quality: Scores markedly higher (4 points) in the DXO overall evaluation.
• Better low-light sensitivity: Can shoot in dim conditions (0.4 stops ISO advantage).
• Easier framing: Has an electronic viewfinder for image composition and settings control.
• More flexible LCD: Has a swivel screen for odd-angle shots in portrait or 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.
• Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.

If the count of relative strengths (bullet points above) is taken as a measure, the G3 emerges as the winner of the match-up (8 : 6 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding 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 Olympus E-PM1 and the Panasonic G3 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 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 E-PM1 and the G3 in practical situations. 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.		Olympus E-PM1	..	86/100	..	71/100	4.5/5	4.5/5	Jun 2011	US$ 499	ebay.com
2.		Panasonic G3	3/5	+ +	..	75/100	4.5/5	5/5	May 2011	US$ 599	ebay.com
3.		Olympus E-P3	..	83/100	..	74/100	4.5/5	4.5/5	Jun 2011	US$ 799	ebay.com
4.		Olympus E-PL1	..	86/100	..	69/100	4/5	4.5/5	Feb 2010	US$ 599	ebay.com
5.		Olympus E-PL2	3/5	83/100	..	71/100	4.5/5	4.5/5	Jan 2011	US$ 599	ebay.com
6.		Olympus E-PL3	3/5	+ +	..	72/100	4.5/5	4/5	Jun 2011	US$ 599	ebay.com
7.		Olympus E-PL5	3/5	+ +	..	..	4.5/5	4.5/5	Sep 2012	US$ 599	ebay.com
8.		Olympus E-PM2	3/5	..	..	77/100	5/5	4.5/5	Sep 2012	US$ 499	ebay.com
9.		Panasonic G2	..	..	..	72/100	4/5	4.5/5	Mar 2010	US$ 599	ebay.com
10.		Panasonic G5	3/5	+ +	..	..	4.5/5	4.5/5	Jul 2012	US$ 599	ebay.com
11.		Panasonic G6	4/5	+ +	..	..	5/5	4.5/5	Apr 2013	US$ 599	ebay.com
12.		Panasonic GF2	3/5	82/100	..	70/100	4.5/5	4.5/5	Nov 2010	US$ 549	ebay.com
13.		Panasonic GF3	3/5	82/100	..	71/100	4.5/5	4/5	Jun 2011	US$ 549	ebay.com
14.		Panasonic GF5	3/5	..	..	..	4.5/5	4.5/5	Apr 2012	US$ 499	ebay.com
15.		Panasonic GH2	5/5	+ +	..	79/100	4.5/5	5/5	Sep 2010	US$ 899	ebay.com
16.		Panasonic GX1	3/5	+	..	77/100	4.5/5	4.5/5	Nov 2011	US$ 699	ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, though. The assessments were made in relation to similar cameras of the same technological generation. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparisons of ratings among very different cameras or across long time periods have little meaning. 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? 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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