Canon 20D vs SX510

The Canon EOS 20D and the Canon PowerShot SX510 HS are two digital cameras that were revealed to the public, respectively, in August 2004 and August 2013. The 20D is a DSLR, while the SX510 is a fixed lens compact. The cameras are based on an APS-C (20D) and a 1/2.3-inch (SX510) sensor. The 20D has a resolution of 8.2 megapixels, whereas the SX510 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

Canon 20D		Canon SX510
Digital single lens reflex		Fixed lens compact camera
Canon EF mount lenses		24-720mm f/3.4-5.8
8.2 MP – APS-C sensor		15.9 MP – 1/2.3" sensor
no Video		1080/24p Video
ISO 100-1,600 (100 - 3,200)		ISO 80-3,200
Optical viewfinder		No viewfinder, LCD framing
1.8" LCD – 118k dots		3.0" LCD – 461k dots
Fixed screen (not touch-sensitive)		Fixed screen (not touch-sensitive)
5 shutter flaps per second		3.8 shutter flaps per second
700 shots per battery charge		250 shots per battery charge
144 x 106 x 72 mm, 770 g		104 x 70 x 80 mm, 349 g

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Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 20D and the Canon PowerShot SX510 HS? 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 Canon 20D and the Canon SX510 are illustrated 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.

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Canon SX510 is considerably smaller (52 percent) than the Canon 20D. In this context, it is worth noting that neither the 20D nor the SX510 are weather-sealed.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the SX510 has a lens built in, whereas the 20D 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 20D and their specifications in the Canon EF Lens Catalog.

Concerning battery life, the 20D gets 700 shots out of its Canon BP-511A battery, while the SX510 can take 250 images on a single charge of its Canon NB-6LH power pack.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. 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 (USD)	Street Price
1.		Canon 20D	144 mm	106 mm	72 mm	770 g	700	n	Aug 2004	1,499	ebay.com
2.		Canon SX510	104 mm	70 mm	80 mm	349 g	250	n	Aug 2013	249	ebay.com
3.		Canon 7D	148 mm	111 mm	74 mm	860 g	800	Y	Sep 2009	1,699	ebay.com
4.		Canon 7D II	149 mm	112 mm	78 mm	910 g	670	Y	Sep 2014	1,799	ebay.com
5.		Canon 10D	150 mm	107 mm	75 mm	850 g	500	n	Feb 2003	1,999	ebay.com
6.		Canon 30D	144 mm	106 mm	74 mm	785 g	750	n	Feb 2006	1,399	ebay.com
7.		Canon 40D	146 mm	108 mm	74 mm	822 g	750	n	Aug 2007	1,299	ebay.com
8.		Canon 50D	146 mm	108 mm	74 mm	822 g	800	Y	Aug 2008	1,299	ebay.com
9.		Canon 60D	145 mm	106 mm	79 mm	755 g	1100	Y	Aug 2010	1,399	ebay.com
10.		Canon SX400	104 mm	69 mm	80 mm	313 g	190	n	Jul 2014	249	ebay.com
11.		Canon SX410	104 mm	69 mm	85 mm	325 g	185	n	Feb 2015	279	ebay.com
12.		Canon SX420	104 mm	69 mm	85 mm	325 g	195	n	Jan 2016	299	ebay.com
13.		Canon SX500	104 mm	70 mm	80 mm	341 g	195	n	Aug 2012	329	ebay.com
14.		Canon SX520	120 mm	82 mm	92 mm	441 g	210	n	Jul 2014	399	ebay.com
15.		Canon Rebel	142 mm	99 mm	72 mm	649 g	400	n	Aug 2003	899	ebay.com
16.		Canon XT	127 mm	94 mm	64 mm	540 g	400	n	Feb 2005	899	ebay.com
17.		Nikon D200	147 mm	113 mm	74 mm	920 g	400	Y	Nov 2005	1,699	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 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 SX510 was launched at a lower price than the 20D, despite having a lens built in. 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 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. 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 tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Canon 20D features an APS-C sensor and the Canon SX510 a 1/2.3-inch sensor. The sensor area in the SX510 is 92 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.6 and 5.6. The sensor in the 20D has a native 3:2 aspect ratio, while the one in the SX510 offers a 4:3 aspect.

Technology-wise, the SX510 uses a more advanced image processing engine (DIGIC 4) than the 20D (DIGIC 2), with benefits for noise reduction, color accuracy, and processing speed.

Despite having a smaller sensor, the SX510 offers a higher resolution of 15.9 megapixels, compared with 8.2 MP of the 20D. 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 1.33μm versus 6.42μm for the 20D). However, it should be noted that the SX510 is much more recent (by 9 years) than the 20D, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently. Coming back to sensor resolution, it should be mentioned that the SX510 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Canon SX510 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the SX510 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 Canon 20D are 17.5 x 11.7 inches or 44.5 x 29.7 cm for good quality, 14 x 9.3 inches or 35.6 x 23.7 cm for very good quality, and 11.7 x 7.8 inches or 29.7 x 19.8 cm for excellent quality prints.

The Canon EOS 20D has a native sensitivity range from ISO 100 to ISO 1600, which can be extended to ISO 100-3200. The corresponding ISO settings for the Canon PowerShot SX510 HS are ISO 80 to ISO 3200 (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.

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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 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.		Canon 20D	APS-C	8.2	3504	2336	none	21.9	11.0	721	62
2.		Canon SX510	1/2.3	15.9	4608	3456	1080/24p	20.0	11.3	586	45
3.		Canon 7D	APS-C	17.9	5184	3456	1080/30p	22.0	11.7	854	66
4.		Canon 7D II	APS-C	20.0	5472	3648	1080/60p	22.4	11.8	1082	70
5.		Canon 10D	APS-C	6.3	3072	2048	none	21.1	10.9	571	57
6.		Canon 30D	APS-C	8.2	3504	2336	none	21.5	10.8	736	59
7.		Canon 40D	APS-C	10.1	3888	2592	none	22.1	11.3	703	64
8.		Canon 50D	APS-C	15.1	4752	3168	none	21.8	11.4	696	63
9.		Canon 60D	APS-C	17.9	5184	3456	1080/30p	22.2	11.5	813	66
10.		Canon SX400	1/2.3	15.9	4608	3456	720/30p	20.1	11.5	672	46
11.		Canon SX410	1/2.3	19.9	5152	3864	720/30p	20.2	11.6	720	47
12.		Canon SX420	1/2.3	19.9	5152	3864	720/25p	20.3	11.7	806	48
13.		Canon SX500	1/2.3	15.9	4608	3456	720/30p	19.8	11.1	494	43
14.		Canon SX520	1/2.3	15.9	4608	3456	1080/30p	20.1	11.5	672	46
15.		Canon Rebel	APS-C	6.3	3072	2048	none	21.0	10.8	544	55
16.		Canon XT	APS-C	8.0	3456	2304	none	21.8	10.8	637	60
17.		Nikon D200	APS-C	10.0	3872	2592	none	22.3	11.5	583	64
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 SX510 indeed provides for movie recording, while the 20D does not. The highest resolution format that the SX510 can use is 1080/24p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the 20D has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the SX510 relies on live view and the rear LCD for framing. The following table reports on some other key feature differences and similarities of the Canon 20D, the Canon SX510, 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.		Canon 20D	optical	Y	1.8 / 118	fixed	n	1/8000s	5.0/s	Y	n
2.		Canon SX510	none	n	3.0 / 461	fixed	n	1/1600s	3.8/s	Y	Y
3.		Canon 7D	optical	Y	3.0 / 920	fixed	n	1/8000s	8.0/s	Y	n
4.		Canon 7D II	optical	Y	3.0 / 1040	fixed	n	1/8000s	10.0/s	Y	n
5.		Canon 10D	optical	Y	1.8 / 118	fixed	n	1/4000s	3.0/s	Y	n
6.		Canon 30D	optical	Y	2.5 / 230	fixed	n	1/8000s	5.0/s	Y	n
7.		Canon 40D	optical	Y	3.0 / 230	fixed	n	1/8000s	6.5/s	Y	n
8.		Canon 50D	optical	Y	3.0 / 920	fixed	n	1/8000s	6.3/s	Y	n
9.		Canon 60D	optical	Y	3.0 / 1040	swivel	n	1/8000s	5.3/s	Y	n
10.		Canon SX400	none	n	3.0 / 230	fixed	n	1/1600s	0.8/s	Y	Y
11.		Canon SX410	none	n	3.0 / 230	fixed	n	1/4000s	0.5/s	Y	Y
12.		Canon SX420	none	n	3.0 / 230	fixed	n	1/4000s	0.5/s	Y	Y
13.		Canon SX500	none	n	3.0 / 461	fixed	n	1/1600s	0.8/s	Y	Y
14.		Canon SX520	none	n	3.0 / 461	fixed	n	1/2000s	1.6/s	Y	Y
15.		Canon Rebel	optical	n	1.8 / 118	fixed	n	1/4000s	2.5/s	Y	n
16.		Canon XT	optical	n	1.8 / 115	fixed	n	1/4000s	3.0/s	Y	n
17.		Nikon D200	optical	Y	2.5 / 230	fixed	n	1/8000s	5.0/s	Y	n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that is present on the 20D, but is missing on the SX510 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 20D writes its imaging data to Compact Flash cards, while the SX510 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 Canon EOS 20D and Canon PowerShot SX510 HS 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.		Canon 20D	Y	- / -	-	-	-	1.1	-	-	-
2.		Canon SX510	-	stereo / mono	-	-	mini	2.0	Y	-	-
3.		Canon 7D	Y	mono / -	Y	-	mini	2.0	-	-	-
4.		Canon 7D II	Y	stereo / mono	Y	Y	mini	3.0	-	-	-
5.		Canon 10D	Y	- / -	-	-	-	1.1	-	-	-
6.		Canon 30D	Y	- / -	-	-	-	2.0	-	-	-
7.		Canon 40D	Y	- / -	-	-	-	2.0	-	-	-
8.		Canon 50D	Y	- / -	-	-	mini	2.0	-	-	-
9.		Canon 60D	Y	mono / mono	Y	-	mini	2.0	-	-	-
10.		Canon SX400	-	stereo / mono	-	-	-	2.0	-	-	-
11.		Canon SX410	-	stereo / mono	-	-	-	2.0	-	-	-
12.		Canon SX420	-	mono / mono	-	-	-	2.0	Y	Y	-
13.		Canon SX500	-	stereo / mono	-	-	-	2.0	-	-	-
14.		Canon SX520	-	stereo / mono	-	-	mini	2.0	-	-	-
15.		Canon Rebel	Y	- / -	-	-	-	1.1	-	-	-
16.		Canon XT	Y	- / -	-	-	-	2.0	-	-	-
17.		Nikon D200	Y	- / -	-	-	-	2.0	-	-	-

It is notable that the 20D has a hotshoe, while the SX510 does not. This socket makes it possible to easily attach optional accessories, such as an external flash gun.

Studio photographers will appreciate that the Canon 20D (unlike the SX510) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the 20D and the SX510 have been discontinued, but can regularly be found used on ebay. The 20D was replaced by the Canon 30D, while the SX510 was followed by the Canon SX520. Further information on the features and operation of the 20D and SX510 can be found, respectively, in the Canon 20D Manual (free pdf) or the online Canon SX510 Manual.

Review summary

So what conclusions can be drawn? Which of the two cameras – the Canon 20D or the Canon SX510 – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.

Reasons to prefer the Canon EOS 20D:

• Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
• Better image quality: Features bigger pixels on a larger sensor for higher quality imaging.
• Richer colors: The pixel size advantage translates into images with better, more accurate colors.
• More dynamic range: Larger pixels capture a wider spectrum of light and dark details.
• Better low-light sensitivity: Larger pixels means good image quality even under poor lighting.
• 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.
• Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/1600s) to freeze action.
• Faster burst: Shoots at higher frequency (5 vs 3.8 flaps/sec) to capture the decisive moment.
• More flexible: Can take a variety of interchangeable lenses, including specialty optics.
• Longer lasting: Can take more shots (700 versus 250) on a single battery charge.
• Better lighting: Features a hotshoe and can thus hold and trigger an external flash gun.
• Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
• More heavily discounted: Has been available for much longer (launched in August 2004).

Arguments in favor of the Canon PowerShot SX510 HS:

• More detail: Has more megapixels (15.9 vs 8.2MP), which boosts linear resolution by 37%.
• Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
• Better jpgs: Has a more modern image processing engine (DIGIC 4 vs DIGIC 2).
• Broader imaging potential: Can capture not only stills but also 1080/24p 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 (461k vs 118k dots).
• Ready to shoot: Comes with an integrated lens, while the 20D requires a separate lens.
• More compact: Is smaller (104x70mm vs 144x106mm) and will fit more readily into a bag.
• Less heavy: Has a lower weight even though it has a lens built in (unlike the 20D).
• Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
• 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.
• More affordable: Was introduced at a lower price, despite coming with a built-in lens.
• More modern: Reflects 9 years of technical progress since the 20D launch.

If the number of relative strengths (bullet points above) is taken as a guide, the match-up finishes in a tie (14 points each). 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 Canon 20D and the Canon SX510 place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Superzoom 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 partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the 20D or the SX510. 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 table below provides a synthesis of the camera assessments of some of the best known photo-gear 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.		Canon 20D	..	..	..	+ +	..	..	Aug 2004	1,499	ebay.com
2.		Canon SX510	..	+ +	..	..	4.5/5	4/5	Aug 2013	249	ebay.com
3.		Canon 7D	5/5	+ +	..	84/100	4.5/5	4.5/5	Sep 2009	1,699	ebay.com
4.		Canon 7D II	4.5/5	+	3.5/5	84/100	4/5	4.5/5	Sep 2014	1,799	ebay.com
5.		Canon 10D	..	..	..	+ +	..	..	Feb 2003	1,999	ebay.com
6.		Canon 30D	..	+ +	..	+ +	o	..	Feb 2006	1,399	ebay.com
7.		Canon 40D	..	+ +	..	+ +	4.5/5	4.5/5	Aug 2007	1,299	ebay.com
8.		Canon 50D	..	+ +	..	+ +	4.5/5	4.5/5	Aug 2008	1,299	ebay.com
9.		Canon 60D	5/5	+	..	79/100	4/5	4.5/5	Aug 2010	1,399	ebay.com
10.		Canon SX400	..	+	..	..	..	..	Jul 2014	249	ebay.com
11.		Canon SX410	..	o	..	..	..	..	Feb 2015	279	ebay.com
12.		Canon SX420	..	..	..	..	..	3/5	Jan 2016	299	ebay.com
13.		Canon SX500	..	+ +	..	..	4/5	4/5	Aug 2012	329	ebay.com
14.		Canon SX520	..	+	..	..	3.5/5	3.5/5	Jul 2014	399	ebay.com
15.		Canon Rebel	..	..	..	+ +	..	..	Aug 2003	899	ebay.com
16.		Canon XT	..	80/100	..	+ +	o	..	Feb 2005	899	ebay.com
17.		Nikon D200	..	+ +	..	+ +	o	..	Nov 2005	1,699	ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The assessments were made in relation to similar cameras of the same technological generation. Hence, a score should always be seen in the context of the camera's market launch date and its price, 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? In case you are interested in seeing how other cameras pair up, just make a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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