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Resolution Chart Comparison (RAW)

Shots here are of our 'version two' resolution chart which provides for measurement of resolution up to 4000 LPH (Lines Per Picture Height). A value of 20 equates to 2000 lines per picture height. For each camera the relevant prime lens was used. The chart is shot at a full range of apertures and the sharpest image selected. Studio light, cameras set to aperture priority (optimum aperture selected), image parameters default. Exposure compensation set to deliver approximately 80% luminance of white area.

For a (more) level playing field we also convert our resolution tests using Adobe Camera RAW. Because Adobe Camera RAW applies different levels of sharpening to different cameras (this confirmed) we had to use the following workflow for these conversions:

  • Load RAW file into Adobe Camera RAW (Auto mode disabled)
  • Set Sharpness to 0 (all other settings default)
  • Open file to Photoshop
  • Apply a Unsharp mask: 80%, Radius 1.0, Threshold 0
  • Save as a TIFF (for cropping) and as a JPEG quality 11 for download
Canon EOS 7D (4.7MB, 18 MP) Canon EOS 50D (4.0 MB, 15.1 MP)
Nikon D300s (3.2 MB, 12 MP) Pentax K7 (3.6 MB, 14.5 MP)

Canon EOS 7D Canon EOS 50D
Nikon D300s Pentax K7

Canon EOS 7D Canon EOS 50D
Nikon D300s Pentax K7

Canon EOS 7D Canon EOS 50D
Nikon D300s Pentax K7

Measurable results

Camera Measurement
Absolute
resolution
Extinction
resolution
Canon EOS 7D Horizontal LPH 2500  * 3800 
Vertical LPH 2500  * 3900 
Canon EOS 50D Horizontal LPH 2450  * 3300 
Vertical LPH 2350  * 3300 
Nikon D300s Horizontal LPH 2300  3200 
Vertical LPH 2250  3200 
Pentax K7 Horizontal LPH 2450  * 3150 
Vertical LPH 2400  * 3400 

* Moiré is visible
+ Chart maximum
LPH Lines per Picture Height (to allow for different aspect ratios the measurement is the same for horizontal and vertical)
Absolute resolution Point at which all lines of a resolution bar are still visible and defined, beyond this resolution loss of detail occurs (below Nyquist frequency).
Extinction resolution Detail beyond camera's definition (becomes aliased)

Shooting in RAW and using Adobe ACR to process the images increases the measured resolution on all four cameras but the difference is less obvious on the 7D than on the competitors. Nevertheless, while the absolute resolution remains almost unchanged, extinction resolution is increased which improves the rendering of very fine detail in an image.

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Comments

Total comments: 10
Girish Madpuwar
By Girish Madpuwar (3 weeks ago)

I am 7D user and have noticed that my images are considerably soft. I mostly use canon 100-400L lens. Initially I thought that its problem with the way I use camera. I tried all possible things. Searched lot and found many discussion about AF problem with 7D. Can someone share their experience?
It seems 7D AF is not consistent although manual focus gives considerably crisp and sharp image.

Comment edited 45 seconds after posting
0 upvotes
Patcheye
By Patcheye (2 months ago)

I'm a wheelchair user and have gone for the 7D because of the increase in range when using a shorter lens over full frame which means though I often cannot get close I often achieve a useable image.

Live on the coast so to avoid problems re dust on the sensor from the beach I purchased a second one a few months back which says, I think, just how pleased I am with the product. Re low iso and noise, possibly because of high light levels from sea reflection and living in a flat open area I personally find no problems but using 2.8 lenses helps. Not professional but have had people use my stuff on their websites - so for my needs the 7D works well - Oh, and if like me you have poor dexterity you'll find the raised buttons really helpful even when wearing gloves.

Comment edited 1 minute after posting
0 upvotes
Ajaykdelhi
By Ajaykdelhi (2 months ago)

I have a 70D, am getting a used 7D at $ 800 next week, will provide a comprehensive review after that

0 upvotes
TahoeJohn
By TahoeJohn (2 months ago)

My Review of the Canon 7d as the owner of one for 1yr is this.I shoot Professionally and have used the 7d for just about 1yr.It is a bit bigger,heavier than my other EOS Canon's.Picture quality is top of the line.Video quality is top of the line.The Grain Factor when using the ISO at a higher number is compensated by a setting in the Menu so no problem.At 8fps continuous it stands above the others.Weather proof as well (Body only).Recently my Canon 7d was knocked over while mounted atop a 6ft tripod landing on solid asphalt.A little scratch on the body was all the damage it received.Though bigger and heavier the construction,function,image quality of this Camera is incredible.I shoot Landscape,Portrait,sports(MMA Fights) and everything in between.Canon went above and beyond with this model.A+ is the grade I give for this one.

0 upvotes
Shashank90
By Shashank90 (3 months ago)

Which one is a better model 70d or 7d , I have read numerous reviews and seen plenty of videos, even though 70d is a much newer version I would like to know from some one who has used them side by side.

0 upvotes
Jostian
By Jostian (2 months ago)

I think both are great, depends on your needs, the 7D is like a tank, the build quality is incredible, its AF is phenomenal (a cut above the 70D in terms of customization options), the 70D has slight advantage 2/3 of a stop at higher iso's, has wifi and touchscreen, the 7D has bigger and better OVF, and the 70D have awesome video capabilities. I played with both and went for the 7D (easy choice), the 70D felt like a toy and I didnt like the plasticky feel (compared to the 7D). Bit both are great, you'll enjoy either depending on your needs.

0 upvotes
EhXsan
By EhXsan (4 months ago)

what is max usable ISO on canon 7d?

1 upvote
PhotobyCarlos
By PhotobyCarlos (7 months ago)

www.photobycarlos.com all my pictures with 7d

2 upvotes
DreamRunnerPhotography
By DreamRunnerPhotography (3 months ago)

Checked your photos at photobycarlos.com. Really it was awesome :) Finally I decided to go for 7D after saw your website. Tnx !!!
please suggest me some good lenses which are more better for portrait & landscape shooting

0 upvotes
gjpuk
By gjpuk (1 month ago)

For potraits i use 5omm prime canon 1.8mm
for landscapes a sigma 10-20mm

0 upvotes
Total comments: 10