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08-11-2010, 01:33 AM   #1
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Opteka Fisheye Adapter vs. Opteka 6.5mm fisheye

B&H,

Question actually for anyone out there.

What would the performance be like to put the Opteka 72mm 0.3x Fisheye Adapter ($239.95) on my Pentax K100D Super (1.5x crop factor) with a 28-80mm zoom already attached??? Yes, I know all about the cheapo $50 fisheye adapters that are crap. But this one from Opteka says it is multicoated, and uses low dispersion glass. Would the fact that it is designed for camcorders make any difference (like color fringing or chromatic aberration being worse on a DSLR compared to using the adapter on a camcorder)???

I don't want to spend $600 for a wide angle zoom and I don't really want to buy a fixed focal length fisheye for $400 (Samyang/Opteka). I figure I can save $160 by getting the adapter. But what would be the performance and resolution?????

I really think the whole ultra-wide lens sector is way too expensive. The profit margins on these things must be enormous.

Hoping someone will have a performance approach to this question, not relying on past experience with cheapo $50 adapters that makes everything fuzzy. Thanks for any help.

GA

08-11-2010, 09:43 AM   #2
B&H Photo Specialist
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Hello,

The Opteka 72mm 0.3x Fisheye Adapter is not designed for a still camera so we are not sure how it will perform. You will more than likely not be able to use the entire zoom range of your lens but have to find a sweet spot where the image quality is acceptable. I used an adapter simila to this on a professional camcorder once and while the center of the image was acceptable, the edges were soft.


C h u c k C a p r i o l a
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*** Peace on Earth ***
08-11-2010, 04:04 PM   #3
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Join Date: Jun 2009
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Original Poster
QuoteOriginally posted by Chuck-B&H Quote
Hello,

The Opteka 72mm 0.3x Fisheye Adapter is not designed for a still camera so we are not sure how it will perform. You will more than likely not be able to use the entire zoom range of your lens but have to find a sweet spot where the image quality is acceptable. I used an adapter simila to this on a professional camcorder once and while the center of the image was acceptable, the edges were soft.


C h u c k C a p r i o l a
Live Chat and E-Mail Sales Manager B&H Photo-Video

Thank you, we appreciate your business.
*** Peace on Earth ***
Thanks Chuck for the quick answer. Maybe I will try it and shoot some before & after test charts to document it for all to see. I am most curious about the #lines of resolution and any abnormal color problems. The crop factor may help as well as the fact that the zoom lens in question has 67mm threads which both help to "look" through the center of the 72mm fisheye, plus taking off the low-profile UV filter. Anyway, checking Google extensively, no one has documented this particular lens anywhere with hard scientific data gathering for still cameras. I am pretty sure I will NOT pay $600 for a UWA zoom lens, the marginal cost of mass-producing a zillion UWA's can't possibly be 100% more than a regular WA zoom (assuming a typical good quality WA zoom street price of about $300). Example - Pentax 16-45 f/4 about $338. Pentax 12-24 f/4 = $700!
GA

Last edited by goldenarrow; 08-11-2010 at 04:23 PM. Reason: extra comment at the end
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