My 100-400 is Not focusing consistently specialy when the light is not optimal

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i saw that you shot that wide open. i know that it is a must sometimes because of light, but seriously try f/7.1 or f/8 if possible when you're at 400mm. i wasn't happy with this lens when i first got it, but after i started shooting at f/7.1 i fell in love with it.

one thing to remember, while its by no means a cheap lens, it is like 1/10th of the cost as those other super telephotos, so shooting at smaller apertures is usually the only way to get shots that are as clear as its much more expensive big brothers.
 
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canon816 said:
Good luck.

There is a similar discussion on another thread about FoCal right now.

http://www.canonrumors.com/forum/index.php?topic=7287.0
Yes, I saw it yesterday. I will read through it. Thanks. I intend to get FoCal soon and get the guesswork out of all this.


keithfullermusic said:
i saw that you shot that wide open. i know that it is a must sometimes because of light, but seriously try f/7.1 or f/8 if possible when you're at 400mm. i wasn't happy with this lens when i first got it, but after i started shooting at f/7.1 i fell in love with it.

one thing to remember, while its by no means a cheap lens, it is like 1/10th of the cost as those other super telephotos, so shooting at smaller apertures is usually the only way to get shots that are as clear as its much more expensive big brothers.
That is my task this weekend. Need to keep my day job for this expensive hobby :)

No cheap lenses for me. I waited 2 years to put money together to get this lens rather than the 70-300...
 
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rpt said:
No cheap lenses for me. I waited 2 years to put money together to get this lens rather than the 70-300...

Did you buy the lens used? you mentioned it was 5 years old. If its erratic when you test it with FoCal, thats a hint that it needs some service.


I really only use mine at or near 400mm, but being able to telescope to a short length is handy. I do not have any low light images with my 100-400mm L..

killdeer-5-14-2011-2613-XL.jpg
 
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Mt Spokane Photography said:
rpt said:
No cheap lenses for me. I waited 2 years to put money together to get this lens rather than the 70-300...

Did you buy the lens used? you mentioned it was 5 years old. If its erratic when you test it with FoCal, thats a hint that it needs some service.


I really only use mine at or near 400mm, but being able to telescope to a short length is handy. I do not have any low light images with my 100-400mm L..
No, the lens was brand new. I just bought FoCal Pro today and so will know the verdict in a few days...

The snap is lovely!
 
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