99mm lens cap?

Discussion in '35mm Cameras and Accessories' started by Todd Adamson, Mar 30, 2013.

  1. Todd Adamson

    Todd Adamson Member

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    After searching for several months, I finally found a reasonable price for a Contax W-1 lens hood for my Vario-Sonnar 28-85. It didn't occur to me that finding a lens cap for an 82mm hood would be so difficult.:tongue:

    I don't need the original Contax K-94, and those are quite pricey, anyway (when you can find one!). What I would like is a screw-in metal cap that fits the threads at the front end of the W-1 hood. I either misread something or I got some bad information and thought that it would be 95mm, so I ordered a 95mm screw cap. It didn't fit, of course, because the threads are 99mm.

    Possibly I should be posting this in the WTB section, but I'm hoping more eyes will see it here, and someone will maybe know of another specific lens that takes a 99mm cap (perhaps some MF lens I don't know about?), and give me suggestions for expanding my search. I did find some auctions for new 3rd party push-on caps for the W-1 hood, one as low as $46. But I'd prefer a threaded cap, and would also prefer not to spend that much for a cap. At least as a temporary solution, I'd be happy to buy a cheap plastic pinch cap, if one exists in the 99mm size. Any ideas?
     
  2. AgX

    AgX Member

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  3. LiamG

    LiamG Member

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    I would stop and break out the calipers- I am no Contax expert, but I did some quick looking around and it appears that there was a cap made for your hood with a listed size of 95mm. 99mm would be a really strange thread ID, but 99mm makes sense as a push-on size for 95mm threads. Measure what you have and perhaps save yourself a lot of trouble.
     
  4. benjiboy

    benjiboy Subscriber

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    Why bother getting a plastic cap for a hood why not just use a UV filter on the lens ?.
     
  5. AgX

    AgX Member

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    Because fingerprints are not good for contrast and sharpness?
     
  6. LJSLATER

    LJSLATER Member

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    Won't the inside ring of the W-1 hood accept a smaller cap?

    I went through a similar problem a while ago with the Nikon HN-15 hood (which looks like this). Because of it's weird shape, the HN-15 won't accept caps on the outer ring, so in the end I bought an 82mm Tamron pinch-style cap which fits on the inner ring of the hood (which is also a weird shape, since it doubles as a series IX filter holder).

    The Tamron lens caps are copies of Nikon's, but in my opinion the former are much better made, they come in a greater range of sizes, and are more reasonably priced.
     
  7. benjiboy

    benjiboy Subscriber

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    How do you get fingerprints on a lens if you have a hood on it ?
     
  8. Todd Adamson

    Todd Adamson Member

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    Breaking News: I might be a bit of an idiot. I've just done careful measurements with a caliper. During these measurements, I realized that the ID of the hood isn't even threaded.:laugh: There are just parallel rings lightly engraved around the ID. I made a bad assumption.

    The OD of the front of the W-1 hood is 99.3mm, so I probably won't even find a good aftermarket solution. As LJSLATER suggested, I'll likely just find a good 82mm plastic cap. The one that came on the lens doesn't seem to fit the hood, but if I go to my LCS and try a few, I can probably find one that works.

    Thanks for your replies! :smile:
     
  9. lxdude

    lxdude Member

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    There are also caps of neoprene that stretch over the hood. Op/Tech has one called Hood Hat; Lens Coat calls theirs Hoodie.

    You can find them at B+H or other large retailers.
     
  10. AgX

    AgX Member

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    I did not understand that hood issue from the start. Now it becomes clear to me...
     
  11. benjiboy

    benjiboy Subscriber

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    It should be a fairly simple project to buy some black plastic card of the right thicness from a model shop and some plastic glue and make one
     
  12. resummerfield

    resummerfield Subscriber

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    I make my own caps, too, by using card stock paper (such as a file folder) and black electrical tape.
     
  13. Todd Adamson

    Todd Adamson Member

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    I ordered one of the Tamron style pinch caps, for $1.68. If it doesn't fit well, I'll just make something. In fact, I already tried to make something, but failed. I went through the cupboards and tested every plastic lid I could find. Eventually, I ran across some of the old-school write protection rings from those huge IBM computers. My father used to run these things for the university in the 1970s, and I guess I had a few "toys" from my youth I never threw away.:laugh: Anyone remember these?
    WriteProtectRings.jpg

    Anyway, it's a perfect fit for the hood. I just have to stretch it the tiniest bit, so it fits snugly and stays in place. I tried to glue a plastic disc cut from a coffee can lid, but SuperGlue didn't hold. Both the lid (and I think the ring) are LDPE. I'm sure if I just did some research and found the right glue, I could fuse them together...
     
  14. John Koehrer

    John Koehrer Subscriber

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    The right glue would be a contact cement of one brand or another. Pliobond, Weldwood etc.
     
  15. Todd Adamson

    Todd Adamson Member

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    For real? I searched Amazon for contact cement, and they all mention wood, glass, and rubber, but not plastic.

    I don't really know how rubber compares to LDPE, chemically, though...
     
  16. AgX

    AgX Member

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    Cementing LDPE, aside of using hotglue, is tricky and needs special primering and special cyanacrylate cement.
    Rubber cement (contact cement) would not work. Contact cement though works on most other plastics.
     
  17. lxdude

    lxdude Member

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    Might as well go all the way and just use duct tape!:happy:
     
  18. LJSLATER

    LJSLATER Member

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    Ha, I like gaffers tape better.