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 Post subject: "Focus by Wire"
PostPosted: Thu Jun 04, 2009 2:20 am 
I've been seriously considering an E520 or E420, but I'm a little concerned about Olympus's method of manual focus. I looked up a description on Wikipedia, but they seem to define this method as difficult for precision. My intention is to use the camera (at least partly) for planetary photos, having it manually focus accurately is critical.
I'm curious what Olympus DSLR owners have to say about this method of manual focus, and if it is workable for planetary astrophotography. Thanks! :D


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 Post subject:
PostPosted: Thu Jun 04, 2009 3:13 am 
i have no isues with the manual focusing on my cameras. just make sure you're within the minimum focusing distance. the 12-60 swd works better to me because of the different system, but i haven't had any negative experiences manually focusing with my other lenses.


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 Post subject:
PostPosted: Thu Jun 04, 2009 3:55 am 
What lenses do you expect to be using for these astrology shots? The focus by wire is inherent to certain lenses [the "basic" lenses only I think] not the body itself. If you mount a Sigma lens on an Oly body, it will still use the traditional method.

Focus By Wire is just different, and can even have its advantages when you know how to use it right. The gist is, if you're turning the focus quick, then it the focus will jump quickly, and if you're tuning it slowly, it will make much finer adjustments.


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 Post subject:
PostPosted: Fri Jun 05, 2009 12:04 am 
Atomic wrote:
What lenses do you expect to be using for these astrology shots? The focus by wire is inherent to certain lenses [the "basic" lenses only I think] not the body itself. If you mount a Sigma lens on an Oly body, it will still use the traditional method.

Focus By Wire is just different, and can even have its advantages when you know how to use it right. The gist is, if you're turning the focus quick, then it the focus will jump quickly, and if you're tuning it slowly, it will make much finer adjustments.


Actually you have a point, the lens I'd use for "astrology" shots would be a 2540mm telescope (10"f10). The "focus by wire" concept wouldn't apply then, would it. I suppose the same would occur if one used Zuiko (35mm) manual lenses as well. But it was good to hear the key to focusing accurately by wire is primarily the speed of rotation. I think I understand better now, Thanks! :D


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