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08-21-2009, 06:08 PM   #1
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Shake reduction with Fish Eye adapter

Hello all -

I have a Samyang fish eye adapter that screws in to the front of a regular lens, giving 180 degree view and I believe multiplying the focal length by 0.15. I am still trying to get the hang of it. Today I was using it on a FA 50mm lens, and forgot to turn SR off at first. Thus, automatically it was set to 50mm. Later I noticed and turned it off. With manual lenses I had been entering the value (focal length x 0.15), which I would have guessed to be the correct thing to do.

BUT - the pictures with SR set at 50 were all much sharper than the pics with SR off. So now I am not sure what I should do moving forward. Anyone have this already figured out?

TIA, Nick

08-21-2009, 06:25 PM   #2
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I have a 6.5mm F3.5 Opteka Fisheye lens and I set SR FL to 8mm because that is as low as SR FL could be set to.
08-21-2009, 06:32 PM   #3
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Leave it at fifty then. When you have a lens that doesn't coincide with the 'in camera' focal length numbers, it's always advisable to go under instead of over.
08-21-2009, 07:02 PM   #4
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Do you like the Opteka? Thanks!!

08-21-2009, 07:36 PM   #5
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Ah Gary, that's what's bugging me. I would think that having the SR set to 50 while the effective focal length was 7.5 would throw it way out of whack. I have seen that happen when I leave it at 500 for my mirror lens, and then use a regular 50mm prime. So why would having it set at 50 be better than none at all? Maybe it was just technical errors on my part. Ill have to try a test with a M 50 - SR at 50, 8 and off, all other settings the same. At some point!
08-21-2009, 09:52 PM   #6
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I'm confused now. In the original post you don't mention anything about setting SR to 8 which is the lowest value. You only mentioned it set to 50 or off. What happens when you set it to 8, any difference?
08-22-2009, 05:32 AM   #7
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I was using an FA lens, so couldn't change the SR settings from 50. I'll dig out an M lens and try.
08-22-2009, 08:09 AM   #8
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QuoteOriginally posted by stanleyk Quote
Do you like the Opteka? Thanks!!
It's a great value for a 180 fisheye lens and I plan on doing some 360 panorama's with it in HDR mode etc. Everything from about 1 ft to infinity is in focus @8.

Samyang 8 mm f/3.5 Aspherical IF MC Fish-eye review - Introduction - Lenstip.com

Hayden Planetarium :: New York City :: 360 Degree Panoramic Photography, QTVR & Virtual Tours :: Sam Rohn

Afdeling Kust - Yachthavens

08-22-2009, 11:35 AM   #9
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Well, I did test it, and it's pretty clear that 8mm is the way to go. Actually I couldn't see much difference between any of them outside at 1/60, but at 1/4 the difference is clear - don't use 50mm. So why did my other ones come out sharper with SR on at 50mm than off? Must have been my error.

SR=8mm


SR=50mm


SR off
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