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> How to manual focus to infinity, Canon 85mm f/1.8 Lens

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carcraze66
post Jul 27 2008, 07:09 PM
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yesterday i also used 85mm at zoo..........added filter one.......when i use MF,also hard to F.........haha
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wKkaY
post Jul 27 2008, 07:42 PM
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Are you sure they're blur because of focusing issues, or blur because of cloud drift?
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cjtune
post Jul 27 2008, 11:07 PM
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QUOTE(gogo2 @ Jul 27 2008, 11:31 AM)
far enuf means set it to 50mm according to my 40D manual... tongue.gif
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Maybe Canon not expecting 40D users to have a 1000mm f/4 lens?


This post has been edited by cjtune: Jul 27 2008, 11:16 PM
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gogo2
post Jul 27 2008, 11:26 PM
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QUOTE(cjtune @ Jul 27 2008, 11:07 PM)
Maybe Canon not expecting 40D users to have a 1000mm f/4 lens?
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actually its regarding checking dust. not sure why 50mm though..
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cjtune
post Jul 27 2008, 11:29 PM
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QUOTE(gogo2 @ Jul 27 2008, 11:26 PM)
actually its regarding checking dust. not sure why 50mm though..
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Hmm, maybe it's to move some internal mechanism away for the user to check for dust more easily.

But hyperfocal distances vary according to focal length, focal distance, aperture size, and film/sensor size.

Generally, if your focal length is short, focal distance is long, aperture size is small, and sensor size is small, the focal distance which you start to hit hyperfocal will be nearer to you.
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albnok
post Jul 28 2008, 01:03 AM
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Speaking of filters, try getting a cross star filter. Not for the effect... but for the obvious visual effect it has on stars. You can see the 'thickness' of the star lines. The thinner, the more in focus you are.

After focusing, remove the filter.
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cjtune
post Jul 28 2008, 01:19 AM
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QUOTE(albnok @ Jul 28 2008, 01:03 AM)
Speaking of filters, try getting a cross star filter. Not for the effect... but for the obvious visual effect it has on stars. You can see the 'thickness' of the star lines. The thinner, the more in focus you are.

After focusing, remove the filter.
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The star lines also get thinner with smaller aperture...

How do the 'stars' know what are you focusing on?
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albnok
post Jul 28 2008, 01:32 AM
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user posted image

This is a crop.

As you can see, the focus is further to the back (left of the picture) and the lines get thinner there. The photographer would have the benefit of adjusting focus with the lens wide open anyway. smile.gif
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cjtune
post Jul 28 2008, 01:44 AM
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QUOTE(albnok @ Jul 28 2008, 01:32 AM)
user posted image

This is a crop.

As you can see, the focus is further to the back (left of the picture) and the lines get thinner there. The photographer would have the benefit of adjusting focus with the lens wide open anyway. smile.gif
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If I have time to put on and take off a star filter, I'd have time to shoot and review the LCD and then shoot again (with adjusted manual focal distance)...
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