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02-28-2019, 10:28 AM   #1
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UWA Prime - Narrowing the choices

Hello all first post here!

The goal is to build an 8 prime kit to have converted for cine use, composed of lenses with matching coatings and characteristics, (roughly) matching years of manufacture, and the best lenses in their particular class. These will be paired with the vintage Cooke TH 20-100mm. I've spent countless hours comparing lenses in the lens review section and have made some great acquisitions, as well as learned a lot.

Current kit is composed of:
SMC Takumar 28mm f/3.5
SMC Takumar 35mm f/2
SMC Pentax-A 50mm f/1.2
Auto-Takumar 55mm f/1.8
SMC Takumar 85mm f/1.8
SMC Takumar 135mm f/2.5

I need to replace the 35mm f/2 because it does not match the images from the other lenses (too warm). No big deal. A macro is also being added.

What I'm missing and can't decide on is an UWA prime. Since these will mostly be used on Super 35mm sensors, it's relatively difficult to go wide while retaining the character of the 70s FF lenses. I've narrowed it down to several choices though, and that's where you all come in...
I'm having trouble deciding between these lenses:

SMC Fish Eye Takumar 17mm f/4 (m42)
SMC Pentax 17mm F4 Fish-Eye (K)
SMC Pentax-M 20mm f/4 (K)
SMC Pentax-A 16mm F2.8 Fish-Eye (K) (Post 70s production)
SMC Pentax-A 20mm F2.8 (K) (Also post 70s production)
SMC Pentax-A 15mm F3.5 (K) (The m42 version price exceeds it's value, IMO)

I'm skeptical of lenses made post-70s, the usefulness of fisheye in cinema, and the inclusion of built-in filters.

I can imagine having a fisheye AND a rect. UWA, but am trying to avoid that. Too much GAS as it is...

Any insight into your experiences with these UWA choices are much appreciated, with crop video use in mind. Thank you!

02-28-2019, 11:07 AM - 1 Like   #2
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The 20 f/4 (M) is a good lens I love mine. But its angle of view is not really "ultra wide" , which words I refer to something like 14-15 mm FL on full frame.
02-28-2019, 12:59 PM - 1 Like   #3
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Well it sounds like you have a decent set of your own criteria and suitable information already - run with your gut!

The only lens of those "UWA" I have is the "SMC Pentax 17mm F4 Fish-Eye (K)", which I like and its very often in my camera bag as its so small!

P.S. You have some nice glass there, particularly jealous of the A50 f1.2. I have the 28 and 55 though and like them.
02-28-2019, 02:55 PM - 1 Like   #4
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QuoteOriginally posted by Turbotak Quote
I'm skeptical of lenses made post-70s, ...

Welcome to the forum.

02-28-2019, 04:14 PM   #5
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QuoteOriginally posted by Paul the Sunman Quote

Welcome to the forum.
Because I want the lenses to all be designed during the same period, as I stated in the OP. They should all be matching in build quality and general design. The exception is the 50 1.2, which is a special purpose lens in the kit.
02-28-2019, 05:14 PM   #6
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The Tak 20mm is awesome from what I've seen. Such amazing contrast and depth.
02-28-2019, 05:39 PM   #7
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QuoteOriginally posted by ZombieArmy Quote
The Tak 20mm is awesome from what I've seen. Such amazing contrast and depth.
You talking about the OG f/4.5 one? I considered that one, had mixed reviews though and is pretty slow. I am somewhat attracted to the sharpness vignette characteristic though, it could match with the Cooke well.
03-01-2019, 02:57 AM   #8
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SMC Takumar 40/4.5 if you want to stay in the same lens series. K20/4.0 has a better IQ.
As far as I know the 15/3.5 has the same optical construction from it's introduction as a SMC Takumar until the A version.

Edit: Sorry forgot the K 18/3.5.


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