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DPChallenge Forums >> Hardware and Software >> 7d will autofocus a f11 lens in live view!
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Showing posts 1 - 12 of 12, (reverse)
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05/05/2010 04:26:18 AM · #1
I discovered something cool when I did my moon double exposure ... using the 100-400 @ 400mm (and therefore min f/5.6) with the 2x convertor which takes the min aperture to f/11 which will therefore will not autofocus on the 7d, if it is in live view it will auto focus :) Not the fastest at focusing so not good for moving subjects but very useful for still objects. You can even zoom in on the live view and it will autofocus on that.

One other thing I noticed is how fast the moon / earth move!! at 10x zoom you can clearly see the moon moving :)

Copyrighted_Image_Reuse_Prohibited_874938.jpg
05/10/2010 04:58:05 PM · #2
Can't you just set it to infinity for that shot??

:)

Nice shot, btw.
05/10/2010 05:32:13 PM · #3
Originally posted by Zeissman:

Can't you just set it to infinity for that shot??

:)

Nice shot, btw.


Infinity, as marked on the lens, can be slightly off due to the temperature.
05/10/2010 06:46:23 PM · #4
Originally posted by DrAchoo:

Originally posted by Zeissman:

Can't you just set it to infinity for that shot??

:)

Nice shot, btw.


Infinity, as marked on the lens, can be slightly off due to the temperature.


Or inferior build quality...
05/10/2010 07:40:50 PM · #5
Originally posted by coryboehne:

Originally posted by DrAchoo:

Originally posted by Zeissman:

Can't you just set it to infinity for that shot??

:)

Nice shot, btw.


Infinity, as marked on the lens, can be slightly off due to the temperature.


Or inferior build quality...


Believe it or not, Infinity on that lens focuses further than the Moon. I haven't tried auto focus with the T2i and live view, but I would expect similar results.
05/11/2010 03:21:47 AM · #6
Originally posted by coryboehne:

Originally posted by DrAchoo:

Originally posted by Zeissman:

Can't you just set it to infinity for that shot??

:)

Nice shot, btw.


Infinity, as marked on the lens, can be slightly off due to the temperature.


Or inferior build quality...


All lenses focus past infinity for the change in temperature reason
05/11/2010 10:10:11 AM · #7
Originally posted by bobonacus:

All lenses focus past infinity for the change in temperature reason

How can anything focus past infinity?
05/11/2010 10:16:55 AM · #8
Originally posted by scalvert:

Originally posted by bobonacus:

All lenses focus past infinity for the change in temperature reason

How can anything focus past infinity?


Lenses have a special feature made specially by Pixar to allow them to focus "To infinity ... and beyond!" :)
05/11/2010 10:46:11 AM · #9
You are a sad, strange little man. You have my sympathy. ;-P
05/11/2010 02:28:08 PM · #10
Shouldn't matter at f/11 if your lens is focused past infinity because you should have plenty of DOF there. Never had a problem myself - even if I'm focused to a bit less than infinity, my f/4.5 (f/9 effective) images of the moon are as sharp (or slightly sharper) as those taken at f/11 (f/22 effective). Past infinity should be the same.

Message edited by author 2010-05-11 22:58:59.
05/11/2010 04:29:24 PM · #11
Originally posted by scalvert:

Originally posted by bobonacus:

All lenses focus past infinity for the change in temperature reason

How can anything focus past infinity?


It's the same technology that gave us 11 on the guitar amp...
05/11/2010 04:35:37 PM · #12
Originally posted by DrAchoo:

Originally posted by scalvert:

Originally posted by bobonacus:

All lenses focus past infinity for the change in temperature reason

How can anything focus past infinity?


It's the same technology that gave us 11 on the guitar amp...


That's the fourth spinal tap reference I've read lately... Oh the humanity!
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