Comments: 8
eprowe [2013-06-29 01:55:02 +0000 UTC]
Congrats on the upgrade Jayme! Made a similar upgrade myself. LOVE the live view for AF. Tack sharp IRs nearly 100% of the time.
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jblaschke In reply to eprowe [2013-06-30 03:14:00 +0000 UTC]
Indeed, I've been very happy with the end results!
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Phostructor [2013-06-24 18:07:03 +0000 UTC]
Congrats - I hope to retire my converted XS in favor of the converting the 50D at some point, (when money flows like water from the sky. . .). I am curious about your comment on the 10-22. I have been unable to get usable results with the XS using that lens, despite fine results with the unconverted 50D. It did not occur to me that the problem might simply be using auto-focus with IR. What can you tell me about it?
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jblaschke In reply to Phostructor [2013-06-24 18:16:03 +0000 UTC]
From what I understand, the EF-S 10-22 has a "floating" IR focal point that varies significantly depending on zoom. So what I do is set it at f/8-f/11 with gives me a very deep field of view with this ultrawide. I'll use AF targeting my rough estimate of hyperfocal distance if I'm shooting landscapes or whatnot. That gave me solid results. Now that I've got the 50D with Live View ability, I'll manually focus using the 10x magnify view to really nail it (the Live View feed comes directly from the image sensor, so if it's sharp on LV, it's sharp, period). I still mostly shoot AF at narrow apertures, but if I'm shooting people them I'll tripod it and fine focus with LV.
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Phostructor In reply to jblaschke [2013-06-24 18:36:03 +0000 UTC]
Thanks for your quick and enlightening answer. A "floating" focal point - more proof (if needed) that lenses are not designed with infrared use in mind! I'll need to do some tripod based tests to see if manual focus is an improvement - luckily the XS has Live View.
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jblaschke In reply to Phostructor [2013-06-24 19:26:44 +0000 UTC]
The floating IR focal point is not uncommon with zoom lenses. One older zoom I saw once had three different markings for different focal lengths.
And honestly, I don't think *any* lenses have ever been designed with IR in mind. It's just a happy accident that some happen to be useful that way!
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robpolder [2013-06-21 22:10:49 +0000 UTC]
hi jayme, nice stories about your cams! looking forward to new IR work - including people? cheers, rob
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jblaschke In reply to robpolder [2013-06-21 23:33:59 +0000 UTC]
Thanks, Rob! Yes, I've got some new people pics coming up shortly!
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