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Telephoto Lenses with focal lengths longer than 60mm.

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Old 7th January 2015
son of sid son of sid is offline
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Olympus m43 40-150mm f2.8 Review

Interesting Detailed review on Thom Hogan's website.

http://www.sansmirror.com/lenses/len...-f28-lens.html

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Old 7th January 2015
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Re: Olympus m43 40-150mm f2.8 Review

Sounds good, but what is linear distortion? When I do a search all I get is stuff about audio, not optical.
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Old 7th January 2015
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Re: Olympus m43 40-150mm f2.8 Review

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Originally Posted by sapper View Post
Sounds good, but what is linear distortion? When I do a search all I get is stuff about audio, not optical.
I think it's when distortion effects are easier to correct i.e. the distribution is uniform in nature as opposed to something like 'mustache' distortion.

Nice review which definitely confirms my thoughts about the lens.
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Old 7th January 2015
Ulfric M Douglas Ulfric M Douglas is offline
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Re: Olympus m43 40-150mm f2.8 Review

From reading that bit I think he's using the words "linear distortion" instead of using the word distortion ... because it sounds cool?
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Old 7th January 2015
Mark_R2 Mark_R2 is offline
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Re: Olympus m43 40-150mm f2.8 Review

I note he states:

'the E-M1 does contrast detect focus with this lens; the E-M1 does phase detect focus only with the older adapted 4/3 lenses'

I remember in another thread that someone pointed out that Olympus literature states the EM1 uses contrast and phase detection AF with micro-4/3 lenses.

I suppose they way the EM1 does AF with micro-4/3 lenses is going to remain a disputed topic for while yet.

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Old 7th January 2015
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Re: Olympus m43 40-150mm f2.8 Review

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Originally Posted by sapper View Post
Sounds good, but what is linear distortion? When I do a search all I get is stuff about audio, not optical.
Hi Dave.
1/ Use the search term "linear distortion lenses" or "linear distortion optics.".

2/ According to this link : http://www.donferrario.com/ruether/l...tion_types.htm It is "failure of the lens to render straight lines in the subject that are off centre in the lens image as straight lines on the film". ie. Barrel distortion and Pincushion distortion which sounds reasonable to me except that these distortions are technically radial distortions relative to the lens axis. The author of the report might have been clearer if he had used a few more words and simply said "Barrel and Pincushion distortion".

Regards.
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Old 7th January 2015
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Re: Olympus m43 40-150mm f2.8 Review

Thanks guys.
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