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01-13-2020, 12:16 PM   #1
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On eBay, SMC PENTAX 1:3.5/15 Aspheric lens, very rare lens?

Saw on eBay:

SMC PENTAX 1:3.5/15 Aspheric lens ++VERY RARE for collector++ | eBay


I would like to known more information on the SMC PENTAX 1:3.5/15 Aspheric lens.
Thank you.

01-13-2020, 12:33 PM   #2
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QuoteOriginally posted by Duvel999 Quote
Saw on eBay:

SMC PENTAX 1:3.5/15 Aspheric lens ++VERY RARE for collector++ | eBay


I would like to known more information on the SMC PENTAX 1:3.5/15 Aspheric lens.
Thank you.

Here you go.....K 15/3.5 AL | The K-Mount Page

I have the non aspherical version of this lens.
01-13-2020, 12:35 PM   #3
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If you haven't already, review this link.

SMC Pentax 15mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database
01-13-2020, 12:36 PM   #4
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There are a few reviews of this lens in the lens review section. They deal with the screw mount version. It seems to review well.



SMC Takumar 15mm F3.5 Reviews - M42 Screwmount Extreme Wide-Angle Primes - Pentax Lens Reviews & Lens Database

Beat me by a few seconds.

01-13-2020, 01:08 PM - 1 Like   #5
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AFAIK there are two versions of the K 15mm, the regular (much more common) and the early aspherical (which has a different optical formula and is quite rare). Alongside modern lenses, I don't think the distinction matters much. But, if you're a collector, the aspherical version is highly sought after.

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01-13-2020, 01:09 PM   #6
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Moved to correct forum ("Pentax SLR Lens Discussion")
01-13-2020, 01:26 PM   #7
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One in my area for $700 .
RARE (1 of 400 made) Pentax 15mm f3.5 - photo/video - by owner - electronics sale
01-13-2020, 01:38 PM   #8
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Thank you guys for yours informations.
So this lens is effectively very rare, only 100 made!

01-13-2020, 02:36 PM   #9
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Look out for cement separation in these. It happens and it can be quite a sad thing to see.
01-13-2020, 02:41 PM   #10
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QuoteOriginally posted by HarisF1 Quote
Look out for cement separation in these. It happens and it can be quite a sad thing to see.
Anything in particular cause this? I'd hate to have my aspherical copy go to pieces.
01-13-2020, 03:46 PM   #11
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QuoteOriginally posted by clickclick Quote
Anything in particular cause this? I'd hate to have my aspherical copy go to pieces.
I'd say heating/cooling cycles would be the main culprits. It's not terribly uncommon on lenses from that age (pretty obvious on stuff like K50/1.2) since the cement must have been less resilient to begin with compared to modern products and probably mainly due to the lenses being 40 to 50 years old.

The upshot to this is that the cement separation can still be repaired. It takes a bit more work than a standard clean of fungus but it should still be doable from a specialist repairman.
01-13-2020, 04:28 PM   #12
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QuoteOriginally posted by swanlefitte Quote
But this is a Takumar. Were there two versions for both mounts?
01-13-2020, 05:38 PM   #13
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QuoteOriginally posted by sergysergy Quote
But this is a Takumar. Were there two versions for both mounts?
Best I could find out yes.
I didn't look at this one close enough to see it's a tak. The header got me curious enough to look it up.
Found old conversations saying 400 taks and 100 k mount but have no clue how reliable that is.
01-13-2020, 06:13 PM   #14
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very interesting! I have one of the taks. I guess now I 'need' the K mount one
01-13-2020, 06:27 PM   #15
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QuoteOriginally posted by HarisF1 Quote
I'd say heating/cooling cycles would be the main culprits. It's not terribly uncommon on lenses from that age (pretty obvious on stuff like K50/1.2) since the cement must have been less resilient to begin with compared to modern products and probably mainly due to the lenses being 40 to 50 years old.

The upshot to this is that the cement separation can still be repaired. It takes a bit more work than a standard clean of fungus but it should still be doable from a specialist repairman.
Thanks. It's in a pretty controlled environment with dehumidification, so hopefully ok.
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