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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 29 May 2009 (Friday) 16:28
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mvshutter ­ 2009
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May 29, 2009 16:28 |  #1

tell if my lenses are good or sharp copies or not? ive been very impressed with the results but just want to check


Canon Rebel T2i, 17-40mm f4L, 85 f1.8
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John_B
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May 29, 2009 16:31 |  #2

mvshutter 2009,
If your very impressed with the results, then I suggest you relax and enjoy your equipment. ;)


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MasterFX
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May 30, 2009 10:17 |  #3

Sharp is for me, if I zoom to 100% and I see details which has a size of 1-2px (little stones, hair...).
But like John said, if you are impressed with the results where's your problem?


Canon 450D/XSi, Tamron 10-24mm f/3.5-4.5, Canon EF-S 18-55mm IS f/3,5-5,6, Tamron 28-75mm f/2.8 XR Di LF, Canon EF-S 55-250 IS, Canon EF 50mm f/1.8 II, Canon EF 85mm f/1.8 USM, Nissin Speedlight Di622

  
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mvshutter ­ 2009
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May 30, 2009 11:25 as a reply to  @ MasterFX's post |  #4

noo problem...just wondering ;)


Canon Rebel T2i, 17-40mm f4L, 85 f1.8
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gjl711
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May 30, 2009 11:29 |  #5

Shoot a resolution chart and compare it to the MTF canon supplies on their website.

http://www.graphics.co​rnell.edu/~westin/misc​/res-chart.html (external link)

http://www.usa.canon.c​om …egoryid=149&mod​elid=15704 (external link)


Not sure why, but call me JJ.
I used to hate math but then I realised decimals have a point.
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MikeMcL
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May 30, 2009 11:30 |  #6

shoot at a ruler, newspaper, checkerboard, or a brick wall from a tripod at about f/5.6 or f/8 in good light.

Then take a look at 100% and see how sharp the details are. if they are clear at 100% you have a good copy. There are more complicated and technical tests, but image quality (to you) is what really matters.

your lens will not be its sharpest at its minimum aperture. usually, you want to stop it down once or twice to get the most out of it.


350d, 5d, 28-70L, 70-200L, 430EX,
50 1.8, 85 1.8 - full alienbees studio set.

MikeMcLane.comexternal link

  
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yogestee
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May 30, 2009 12:15 as a reply to  @ MikeMcL's post |  #7

If you've been impressed so far leave well alone.. Once you start testing you'll get a disease called "Imaginitis" where you look for faults that aren't really there.. Badly set up tests are notorious for people blaming their lenses..

Just enjoy your lenses..


Jurgen
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