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bidimagic
6th of July 2005 (Wed), 07:53
Hi. I have just purchased a 75-300 IS zoom (used).
The first test I made was to get pictures at 300mm having the whole
picture on the same focal plane.
This way I noticed that the borders of the picture seems to be "out of
focus" ...
Do you know if it is common for this lens ? I use F/8 ... maybe I have
to try stopping down more ?

Thank you for your suggestions!
MrChad
6th of July 2005 (Wed), 08:52
I don't have any issues with my Combo, you may want to send the lens to Canon, can you manual focus the lens better?
bidimagic
6th of July 2005 (Wed), 09:02
I don't have any issues with my Combo, you may want to send the lens to Canon, can you manual focus the lens better?

are you suggesting to try with manual focus instead ?
I'm going to do this, and also to try with f/16, f/22 and so on...
MrChad
6th of July 2005 (Wed), 17:38
I'm suggesting no lens should ever be fuzzy on the edge, especially on a APS-C Drebel.
I think you rlens needs an adjustment from Canon.
bidimagic
7th of July 2005 (Thu), 01:47
I'm suggesting no lens should ever be fuzzy on the edge, especially on a APS-C Drebel.
I think you rlens needs an adjustment from Canon.

OK I will ask the shop were I bought it.
Thank you for your help.
mocca
7th of July 2005 (Thu), 06:49
The 75-300 IS USM is known to be quite soft at 300mm. Since you said that everything is in the same focal plane, try stop down to about f/11 and take a picture again. Keep in mind that if you are using tripod, you will have to turn OFF the IS since it is the 1st gen.

MM
MrChad
7th of July 2005 (Thu), 20:16
The 75-300 IS USM is known to be quite soft at 300mm. Since you said that everything is in the same focal plane, try stop down to about f/11 and take a picture again. Keep in mind that if you are using tripod, you will have to turn OFF the IS since it is the 1st gen.

MM

I've not found the tripod rule to be firm, I've used the lens on a tripod a bunch of times.
bidimagic
8th of July 2005 (Fri), 07:21
I have found another person having the same lens, and I've just tested that on my camera. It seems that both behave the same way, that this, it seems that is common for the 75-300 IS to be quite soft at the edges (I've tried at f/16 at 300mm).
It is not a big problem though, I can live with it ...