Lens cap for Minolta Spotmeter F

Discussion in 'Lighting' started by Diapositivo, Jun 8, 2011.

  1. Diapositivo

    Diapositivo Subscriber

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    Hallo,
    I have a Minolta Spotmeter F which I bought second hand a few years ago, without the lens cap. I would like to buy a lens cap for it. The manual does not mention which diameter should I buy. I have to know as I don't think this stuff is so easy to find in a shop.

    Measuring the diameter with a rule I find the outer diameter is probably 39mm (should use a calibre to be sure).

    I suppose a generic lens cap with diameter 39mm should go, but I consider that usually lens caps are actually indicated with the thread filter mount diameter, which is on the inner side of the barrel. So a cap which is meant to fit a 49mm lens thread is actually a bit larger than that, as it has to cover also the thickness of the metal.

    So the question is:
    would a generic lens cap sold as 39mm diameter work?

    something like this:

    http://cgi.ebay.it/Objektivdeckel-S..._Camcorder_Objektivdeckel&hash=item35aaf53b8e

    although I would go for something cheaper.

    Thanks
    Fabrizio
     
  2. stillsilver

    stillsilver Member

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    Hello Fabrizio, I checked my meter and the cap is a slip-on cap. Use the outside diameter when getting your cap.

    Mike
     
  3. Lee L

    Lee L Member

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    The internal thread size for the Spotmeter M and F lens barrel is 35.5mm. The O.D. of the barrel is close enough to dead on 39mm according to my vernier calipers.

    The e-bay item linked to would be too large to catch the internal threads.

    Lee
     
  4. Diapositivo

    Diapositivo Subscriber

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    I'll look for a 39mm press-on cap then, thanks for your help.

    Fabrizio
     
  5. glbeas

    glbeas Member

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    The threads I think are so it can accept a closeup accessory lens for metering in those ranges. I've got one but never tried it to see if it made a difference.
     
  6. Lee L

    Lee L Member

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    Yes, that accessory is just to allow better, more accurate focus on the metering cell at close distances.

    Lee