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View Full Version : 100-400 IQ...is my copy of canon 100-400 sharp?



Marko Matesic
02-12-2008, 05:01 PM
Is my copy of canon 100-400 sharp??
What do you think?....
images are unedited and unsharpened , in PS...only image size and 100% crop,saved as jpg quality 12

20D+ 100-400@400...f/6.3, 1/640 s,-1.00 eV, ISO 200, on bean bag

http://img266.imageshack.us/img266/7711/mg743701oi9.jpg

full image

http://img266.imageshack.us/img266/6084/mg743701copytn2.jpg

100% crop

glad to hear your opinion

Jim Neiger
02-12-2008, 05:08 PM
Hi Marko,

It is very difficult to determine the sharpness of your lens by viewing an image displayed on the web. I would suggest that you make similar images with your lens and another prime lens that you are confident is sharp and then compare the images at full size. If you can easily tell a difference in sharpness, then your 100-400mm may not be a sharp copy and should be sent in along with your example images. I can't easily tell images apart between my 100-400mm and my 500mm or 300mm. I have a very sharp copy of the 100-400mm. It's sharp even when used wide open.

Fabs Forns
02-12-2008, 05:44 PM
Marko, I had a very sharp copy of that lens when I did Canon, and still sometimes, an occasional image would not be sharp due to many circumstances.
Jim's test sound like a good way to tell. 640 is a borderline shutter speed....

Marko Matesic
02-15-2008, 02:44 PM
Thank you for your kind help.....I will try to make some test shots as you described!