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08-20-2018, 06:44 AM   #1
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50MM Lens

Didn't know where else to post this. I have a Pentax SMC-A 50mm 1.2 k mount lens for my K1000. According to he lens review for this lens, it shows that a 52mm filter will fit. I have a 52mm red b&w schre in filter. but its a tad bit to big, to the point that the thread sits just outside of the threads on my lens. Trying to find the right size of screw in filters for my lens. Anyone have this lens and can give me some info on what filters to snag for it? I'm wanting a nd filter, and a b&w filter for contrast.

08-20-2018, 07:01 AM   #2
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I know you said K and f1.2, could it be this M F2?

SMC Pentax-M 50mm F2 Lens Photo - Pentax Lens Reviews & Lens Database
08-20-2018, 07:05 AM   #3
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its an A 50mm

SMC Pentax-A 50mm F1.2 Reviews - A Prime Lenses - Pentax Lens Reviews & Lens Database
08-20-2018, 07:07 AM   #4
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QuoteOriginally posted by craveone Quote
Didn't know where else to post this. I have a Pentax SMC-A 50mm 1.2 k mount lens for my K1000. According to he lens review for this lens, it shows that a 52mm filter will fit. I have a 52mm red b&w schre in filter. but its a tad bit to big, to the point that the thread sits just outside of the threads on my lens. Trying to find the right size of screw in filters for my lens. Anyone have this lens and can give me some info on what filters to snag for it? I'm wanting a nd filter, and a b&w filter for contrast.
That's odd, since the photos in the PentaxForums lens review database show a 52mm filter mounted on the special edition of the lens.

08-20-2018, 07:07 AM   #5
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Are you sure it isn't a SMC-A 50mm f2 lens? It would be very unusual for a K-1000 to come with a SMC-A 50mm f1.2.

The SMC-A 50mm f2 lens has a 49mm filter thread, so your 52mm filters would be too big in just the way you describe.

The engraving on the lens will say SMC PENTAX-A 1:1.2 or SMC PENTAX-A 1:2.


In addition to the 3mm difference in the filter thread, there is about a $400 difference in the price.

Last edited by Unregistered User; 08-20-2018 at 07:12 AM.
08-20-2018, 07:09 AM   #6
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And the wording on the lens is 1:1.2? Not 1:2?
If so Look carefully to see if there is an adapter ring in the lens filter ring.
08-20-2018, 07:14 AM - 1 Like   #7
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N00B ALERT***

I was mistaken, it is f2, not f1.2

08-20-2018, 07:16 AM   #8
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No doubt.
Your lens is the A f/2 (sorry to tell you).
You will need a 49mm filter.

EDIT: post above.
08-20-2018, 07:27 AM - 1 Like   #9
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QuoteOriginally posted by craveone Quote
N00B ALERT***

I was mistaken, it is f2, not f1.2
A common mistake. Don't sweat it.
08-20-2018, 07:30 AM   #10
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You could get a cheap 49-52mm adapter ring for a buck from ebay it you want to use your red filter.
08-20-2018, 07:32 AM   #11
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QuoteOriginally posted by Cipher Quote
You could get a cheap 49-52mm adapter ring for a buck from ebay it you want to use your red filter.
As someone who went from Nikon to Pentax I've done that many times.
08-20-2018, 07:35 AM   #12
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QuoteOriginally posted by Cipher Quote
You could get a cheap 49-52mm adapter ring for a buck from ebay it you want to use your red filter.
Not a bad idea.. I'll go that route... actually, my local camera shop may have something like that as well.. thanks once again everyone!
08-20-2018, 10:47 AM - 2 Likes   #13
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If I had a nickel for all the sale listings that promised 50/1.2 but in actuality only offered a 50/1:2......
08-20-2018, 03:12 PM   #14
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QuoteOriginally posted by tvdtvdtvd Quote
If I had a nickel for all the sale listings that promised 50/1.2 but in actuality only offered a 50/1:2......
True. The difference being only a point. That's why pictures of the actual item are so important.

08-20-2018, 04:35 PM   #15
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QuoteOriginally posted by torashi Quote
True. The difference being only a point. That's why pictures of the actual item are so important.
It's not just a matter of a point, but one of punctuation. It's not as if 1.2 is being confused with 12.0 or 0.12.
Rather, 1:1.2, often written in shorthand as f/1.2 or 50/1.2, is being confused with 1:2, which in the same
shorthand should be f/2 or 50/2, but is very, very often mistakenly given as f/1.2 or 50/1.2. Simply put,
the ":" in 1:2 is often read as "." even though the two punctuation marks signify different things.

Curiously, I have never seen anyone list a 50/1.12 or 50/11.2 lens for sale.
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