Simple Q: lens cap size for Konica IIIa 50mm lens

[Trask]

I recently picked up a clean Konica IIIa with the 50mm f/1.8 lens. I'll be getting it CLA'd but first I need a lens cap. I'd almost prefer a push-on instead of a clip-in just to avoid any possibility of touching the clean lens.

My ruler says that a push-on would be either 58, 59, or 60mm. A clip-in would be a bit less.

Can anyone confirm the correct size, of either type? I'd certainly appreciate it.

 

[Francis in VT]

My Hoya filter book lists the Konica IIIA filter size at 43mm.

Tiffen Dealer book lists it as 43M (medium thread).

Neither has a slip-on cap size but from experience
I would cuess at 45-46mm.

 

[eric]

Google Greg Weber. He's the MAN for Konica information. Are you sending your IIIa to him?

 

[Trask]

Yes. It'll be a bit pricey to get it CLA'd, as the shutter is sticky, but my preliminary pictures show me that the lens has nice qualities, and man is this thing quiet. I do think it's quieter than my Leica M2 or M3.

 

[Christopher Walrath]

With the thinness of the threads you oughtta just be able to mike it. No calipers handy? Just take it to a local machine/fabrication shop, auto parts store or such. You'll get looks but you'll get your answer as well.

 

[John Koehrer]

If the filter size is 43mm as mentioned the slip-on cap will have an inside diameter of 45mm. Clip on will be 43mm. You should be able to pick one up for a couple of bucks.

 

[Trask]

Thank you to you all for this useful information.