I've had this thing at the back of my mind for the past week now and I couldn't bring myself not to do the test.

Here's the test and result.

Methodology:

I printed a test chart and placed the printed paper on a 45-degree angle to the horizontal. With the camera and lens parallel to the horizontal, I focused at the target spot (text that reads: THIS TEXT SHOULD BE IN PERFECT FOCUS) at the lens' minimum focusing distance at F2.8. Focus was achieved using Auto-Focus with the Canon EOS 400D's center AF point.

The camera was on self-timer on a sturdy Manfrotto tripod with a ball-head. All settings are the same except the lenses used.

Result:
All crops no adjustment nor post processing.

Lens: Canon EF 28-70mm F2.8L USM
http://www.randytamayo.com/blogger/lenstest/2870.jpg

Lens: Canon EF 50mm F1.8 Mark I
http://www.randytamayo.com/blogger/lenstest/50m1.jpg

Lens: Canon EF 50mm F1.8 Mark II
http://www.randytamayo.com/blogger/lenstest/50m2.jpg

Conclusion:

I think I need to bring 2 of my lenses in for lens calibration. The zoom lens and the old lens seem to be back-focusing around 4mm.

So, the "thrifty fifty" did it again, eh? The contrast was better too.

im looking for a lenses to be for my new system.

can someone help me to check the following lenses:

canon
70-200mm f/2.8L IS USM
24-70mm f/2.8L USM or 24-104 f/4L IS USM
100mm f/2.8 macro
10-22mm f/4

are all these enough for studio and coverage that im planning to go???

Thanks

FherD


I've had this thing at the back of my mind for the past week now and I couldn't bring myself not to do the test.

Here's the test and result.

Methodology:

I printed a test chart and placed the printed paper on a 45-degree angle to the horizontal. With the camera and lens parallel to the horizontal, I focused at the target spot (text that reads: THIS TEXT SHOULD BE IN PERFECT FOCUS) at the lens' minimum focusing distance at F2.8. Focus was achieved using Auto-Focus with the Canon EOS 400D's center AF point.

The camera was on self-timer on a sturdy Manfrotto tripod with a ball-head. All settings are the same except the lenses used.

Result:
All crops no adjustment nor post processing.

Lens: Canon EF 28-70mm F2.8L USM
http://www.randytamayo.com/blogger/lenstest/2870.jpg

Lens: Canon EF 50mm F1.8 Mark I
http://www.randytamayo.com/blogger/lenstest/50m1.jpg

Lens: Canon EF 50mm F1.8 Mark II
http://www.randytamayo.com/blogger/lenstest/50m2.jpg

Conclusion:

I think I need to bring 2 of my lenses in for lens calibration. The zoom lens and the old lens seem to be back-focusing around 4mm.

I hope you don't mind me asking but where do you have your lenses calibrated? How about for 3rd party lenses like tamron, where can I have it calibrated?

If I were to have my Canon lenses calibrated, I would DEFINITELY bring them to Canon Marketing Philippines. :)

For the other brands (even Canon mounts) uhmmm, well...

i've tried it before with one of my lens
test your lens & camera for back focus & front focus problems

Focus test chart (http://md.co.za/d70/chart.html) procedure & chart here

my test is in using the tamron 28-105 /f2.8 :o
BTW i just estimated the 45 degree angle ;D

http://aycu03.webshots.com/image/3082/2004253469954350589_fs.jpg
http://ww1.pureupload.com/public/pview/28981/normal_pict3731.jpg

That's it. Next time I go to Quiapo am bringing this chart with a 45 degree triangle with me :) Will add this test to the usual sharpness, distortion and color tests I make. Now I have to make some tests tonight. Hope my lenses fare well.

Came from Canon yesterday to have my lenses and body cleaned. So today decided to make a quick test:

http://homepage.mac.com/lestercallanta/focustestchart50mm1.jpg
ISO 100 1/640 50mm f/1.8

I think Randy's 50mm fared better than mine. But this could have been shot in a more controlled environment since I shot this outside with a less stable self-standing monopod. But overall am pretty happy with my sample.

BTW, OS X users with the latest 10.4.8 update can zoom in with the ctrl + mouse wheel combo.

guys? where can i grab a copy of that "calibration chart"? Thanks!

^^ czar, back read a little... look for willy's post... it should be a link in bold blue text ;)

guys? where can i grab a copy of that "calibration chart"? Thanks!

sorry I guess the link above got mixed up somehow, anyways here's the link

http://focustestchart.com/chart.html