Filter for PENTAX Super TAKUMAR 135mm F/3.5 MF Telephoto Lens For M42

[RamKrish]

Hi,

I am trying to figure out what kind of filter will fit my PENTAX Super TAKUMAR 135mm F/3.5 MF Telephoto Lens For M42. Can someone please help me with this?
Thanks.

Regards,
Ram

[Nishit Dave]

Needs more information. Are you talking about a screw-in filter?

[RamKrish]

Thanks for the response.
That's right, that is what I'm looking for. I tried a 39mm filter but that seemed about 2-3mm shorter than the inner diameter.
The model that I have is

https://www.ebay.com/itm/315853060941?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D264183%26meid%3Da3380aec82ae43e3a6224a159edc625e%26pid%3D101875%26rk%3D1%26rkt%3D12%26sd%3D326282480592%26itm%3D315853060941%26pmt%3D1%26noa%3D0%26pg%3D2332490%26algv%3DSimplAMLv11WebTrimmedV3MskuWithLambda85KnnRecallV1V2V4ItemNrtInQueryAndCassiniVisualRankerAndBertRecallWithVMEV3CPCAutoWithCassiniEmbRecall%26brand%3DPENTAX&_trksid=p2332490.c101875.m1851&itmprp=cksum%3A315853060941a3380aec82ae43e3a6224a159edc625e%7Cenc%3AAQAJAAABcEnLatTXWXNAKPRnYtxVTXN2rJD11TMrqd%252Bc4NcqE%252BNGk6ejyqiKoKTZm%252BWiG7rLUKnmQT96yLmgza78VpCainYj%252Fcd7BbF%252F3JO7HSXt2n3iFYDbns8rSMT0idXbcmlMHWKniLK2o5tYYPmM8KWpVo95tWt2nTiQXMqmKRIMl5gAplMB1Ggx6kVqfXRetLAgGMR5spVMASIcHMnkXrBEU3RYdAHG3m9la9cB%252FqFw8dp2YtdCJfVofu2u0Pt286PKrwwqFH%252BmpJ6QPhqtsjVxUnP2Ol1jtBMRBRBBDs6TBIntwk4iQfBJrfAD%252BeTUU1q7t%252F%252BqGJ2VqtYMK9%252BXC2BqJTRcu%252BKUYiEl13jU3otOpM1oy6%252FG4u3K5FLahs%252FhXxTd%252FP8IzEnk4nR1g4Yl7Bd8UHGPY%252B7FAitt6aPSfRdqHQEs6mcMqceOv24VDkb7jU8Cg6QfH3GBqO5B9lv9EO5YXC4gtApc8g1Ha8y7GnSQL0F1%7Campid%3APL_CLK%7Cclp%3A2332490&itmmeta=01JCR25BBMCDR65X2TRN5QWV9K

If not a screw-in filter, what other options might be available for this model?

[karansinh]

49mm filter size will fit.
This lenses came in 2 sizes... Smaller earlier version silver/black came with 46mm filter size.

[hvyas]

The lens/ lens cape indicates filter size. My SMC PENTAX-M 135MM f3.5 lens needs 49mm thread filter.

[RamKrish]

The 49mm filter comes till the outer diameter of the lens and can't be screwed in.

Am I missing something very basic?

[hvyas]

https://www.pentaxforums.com/lensreviews/Takumar-Auto-Takumar-135mm-F3.5.html

46mm filter size.