500mm fixed lens wont work with my adapter?

Discussion in 'Digital Discussion & Q&A' started by leejt1986, Jul 31, 2010.

  1. leejt1986

    leejt1986 TPF Noob!

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    I have a 500mm prooptic fixed mirror lens i got off ebay. I thought of using my 2x extender and i get a message saying about cleaning the lens contact.

    Is there a reason it wont work? is it because of the type of lens?
     
  2. Josh66

    Josh66 Been spending a lot of time on here!

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    Did you try cleaning the lens contacts?


    It may not autofocus with the adapter, but other than that - I see no reason why it wouldn't work...
     
  3. Sw1tchFX

    Sw1tchFX TPF Noob!

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    a 2x teleconverter on an (i'm assuming) f/8 mirror lens...1000mm f/16.. good luck seeing through the viewfinder, let alone getting a picture that's remotely sharp!
     
  4. Josh66

    Josh66 Been spending a lot of time on here!

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    It's probably not too bad... I have a 1200mm f/13.3 telescope that I have shot through a few times. The hardest part is focusing, and having a rock steady platform to shoot from. I've mainly just used it for things like the moon (fills the frame perfectly with no cropping).

    The viewfinder image is brighter than you'd think. I don't think f/16 (or close to that) would be much worse.



    But yeah - mirror lens, so no AF anyway (oops, missed that in my first post).

    Actually, the lens contacts shouldn't even matter at all - it's a manual lens, there is no electronic communication.

    What mode are you trying to use it in? I'm pretty sure it will only work in manual. Any other mode will think that you don't have a lens on the camera. Manual doesn't care if you have a lens or not.
     
  5. leejt1986

    leejt1986 TPF Noob!

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    How would I go about cleaning the contact lens?

    I dont know if this matters, but its a Vivitar extender and it say its for canon eos lenses, my 500 isnt a Canon lens. Could that be why?
     
  6. leejt1986

    leejt1986 TPF Noob!

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    That was my first thought as to why the extender wouldnt work in the first place
     
  7. Josh66

    Josh66 Been spending a lot of time on here!

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    A lot of people suggest using a pencil eraser, or even the other end (graphite). I don't think that's really the problem now though - since it's a manual lens. There isn't anything on the lens for the contacts to make contact with...


    The lens does have an EF mount though, right?


    What mode are you shooting in? I think it will only work in manual mode.

    Does it work without the extender?
     
  8. leejt1986

    leejt1986 TPF Noob!

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    Yes I think so

    I've tried every mode...same error message in each
     
  9. Josh66

    Josh66 Been spending a lot of time on here!

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    With and without the extender?
     
  10. leejt1986

    leejt1986 TPF Noob!

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    the lens works fine without the extender and the extender works on my 70-300mm lens
     
  11. Derrel

    Derrel Mr. Rain Cloud

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    Well...does the 500mm mirror lens have contacts on the back of it??? Since virtually all mirror lenses (except the new Sony 500mm AF) are manual focus, and since mirror lenses only have one aperture, there is no real, pressing absolute need for them to be fitted with electrical contacts...and many mirror lenses are designed so that the manufacturer or reseller can easily adapt the mount to fit multiple camera brands. A good many 500mm mirror lenses are relatively cheap designs, so, maybe this one's not engineered with total compatibility for *your* particular camera brand's mount and all permutations of teleconverter.

    What brand of camera and what brand of TC are you using?
     
  12. Josh66

    Josh66 Been spending a lot of time on here!

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    Even so - as long as the mount was machined correctly (shouldn't be too hard...), how could it be 'incompatible'? Granted - there will be no electronic communication, but that shouldn't matter. I have a body cap modified as a pinhole 'lens'. It's just a body cap with a hole in it. I also have the t-ring for my telescope - just a chunk of steel machined to the right shape.

    Neither of those have electronic contacts, but they both work fine...

    Hell, if I really had to - I could make a fist with a small hole in it and hold that up to the camera - it would work just as well as the t-ring or pinhole body cap...

    It would be far from ideal, but you can't deny that I would be able to produce a photo using just my hand...
     
    Last edited: Aug 1, 2010

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