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05-18-2011, 12:38 PM   #1
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Pentax-67-35mm-F4.5-Fish on Pentax 645d

As i understand, it is almost exclusive solution for fish-eye photography on Pentax 645d. Am i right?

this lens:
SMC Pentax 67 / Takumar 6x7 35mm F4.5 Fish Eye Reviews - Pentax Lens Reviews & Pentax Lens Database

via this converter:
Pentax 67 Lens to Pentax 645 Body Adapter Reviews - Pentax Lens Reviews & Pentax Lens Database

I am very curious to see sample pictures from this lens

05-19-2011, 09:11 AM   #2
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or a 35mm Zodiak with a P[entaconsix]6 to p645 adapter (the economic way ) or (of course more costly ) a 30 mm Carl Zeiss F-Distagon with Habla to P645 adapter t.b.c.
05-19-2011, 09:31 AM   #3
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Using a fisheye for 55x70 mm on a 33x44 mm sensor will spoil most of the "effect", and only give you a wideangle with very bad distortion. Thus, a bad idea in my opinion.
05-19-2011, 09:37 AM   #4
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QuoteOriginally posted by Makten Quote
Using a fisheye for 55x70 mm on a 33x44 mm sensor will spoil most of the "effect", and only give you a wideangle with very bad distortion. Thus, a bad idea in my opinion.
hmm... it`s hard to disagree with you..it is interesting have anybody try to use this lens with 645? i google this topic, but found nothing concrete....
now i realize that, if i want to get best quality wide angle - i must get pentax 25mm f4 lens, but it is too expensive for me right now


Last edited by spacevoid8; 05-19-2011 at 09:42 AM.
05-19-2011, 10:54 AM   #5
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there is a thread here in the forum about the Zodiak 35mm.

The new Pentax 25mm is really a fisheye ? - I allways thought it is a ultra wide
05-19-2011, 11:19 AM   #6
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>there is a thread here in the forum about the Zodiak 35mm.
thanks for advance

yes it is ultra-wide, i`ve mistaken.. sorry..
05-19-2011, 05:42 PM   #7
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I've chipped in on a few threads as I bought a Zodiak 8 30mm for my 645D from a fellow forum member.

It's a rectangular fisheye and the distortion at the edges is easily corrected and not averly dramatic, so it's much more like an ultra wide than a fish'

would love to try the new 25mm, but the budget is still recovering from the 645D purchase and $5K for a lens is a bit beyond me at the moment.
05-19-2011, 08:32 PM   #8
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QuoteOriginally posted by Warped Quote
I've chipped in on a few threads as I bought a Zodiak 8 30mm for my 645D from a fellow forum member.
would love to try the new 25mm, but the budget is still recovering from the 645D purchase and $5K for a lens is a bit beyond me at the moment.
Exactly the same situation

05-20-2011, 01:51 AM   #9
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Adapter + a Carl Zeiss F-Distagon CF 3.5/30mm is a 2k solution. The ukrainian way costs a quarter ...
05-20-2011, 04:57 AM   #10
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I tried the 67 fisheye a few times on the 645D. It's angle of view is somewhat larger than the 645 35mm, but it is not as sharp and makes the camera unbalanced, so I concluded it wasn't very useful unless you want distortion or really need the larger angle of view. I took some examples today to post. First a shot that shows the distortion in the 67 lens; 2nd a shot with the 645 35mm lens; last the 67 35mm. (same position and f/8; left sides aligned.
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PENTAX 645D  Photo     

Last edited by Thomas; 05-20-2011 at 07:41 AM.
05-20-2011, 11:08 AM   #11
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many thanks for sharing examples!
05-20-2011, 06:18 PM   #12
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QuoteOriginally posted by spacevoid8 Quote
many thanks for sharing examples!
You're welcome.
05-21-2011, 05:47 AM   #13
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thanks @ Thomas for sharing the samples and a nice room - I always dreamed from a writing desk on such a window.....
05-21-2011, 01:32 PM   #14
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A fisheye lens at the same focal length will give a wider FOV due to the fisheye design.

One advantage of using Fisheye lenses for smaller format is that the curvature is not as pronounced and easier to correct if needed.

When I needed fisheye for my 645 I just use my Arsat (Ukrainian) 30mm. It is much wider than the Pentax 35mm. The tradeoff is curvature and sharpness even stopped down.
05-22-2011, 12:44 PM   #15
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Distortion is a strange thing. It has been said that optical systems (lenses, telescopes etc.) can correct for rectilinear distortion (Barrel, Pin-cusion) or spacial distortion but not both at the same time. It is really interesting to see this in the shots shown above. The rectilinear 645, 35mm shot shows the pot in the lower left corner to be stretched, indicating a spacial inaccuracy, while the 35mm from the 67 with uncorrected barrel distortion has the pot looking more normal spacially.
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