/////Astrophotogaphy with 35mm Film Camera
Astrophotogaphy with 35mm Film Camera2019-03-25T11:21:02+02:00

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Astrophotogaphy with 35mm Film Camera

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  • Tricky Dicky
    Participant
    Post count: 4

    Hi Everybody,

    I am thinking of resurrecting my old Ricoh KR5 film camera to try and take some astro photos, I only have 800 ISO film left (very old).

    What I would like to ascertain is which rule 4oo, 500 or 600 would be the best. I will be using a prime 55mm f2.2, manual focus lens on the camera.

    Any suggestions would be greatly appreciated.

    Thanks.

    Dick.

  • Peter Connan
    Participant
    Post count: 817

    Hi Dick

    Sorry to be the bearer of bad tidings

    To get pin-point stars with that lens, your shutter speed should be around 10 seconds maximum. Correct exposure at such a short shutter speed and f2.2 would require an ISO close to 9 000.

    Thus really your only bet is to do star trails. Try an hour at f5.6 and ISO800 or half an hour at f4.0?

  • Tricky Dicky
    Participant
    Post count: 4

    Dear Peter,

    Thanks for the advice, I will try Star Trails.

    Just for my info, how did you come to the figure of about 9000 ISO. I understand the calculation of the 10 seconds, as for the ISO, I have not come across any calculation as yet.

    Thanks.

    Dick.

  • Peter Connan
    Participant
    Post count: 817

    Hi Dick

    In my limited experience, you need a combined exposure of around 7.3EV.

    I developed myself a little spreadsheet which works out this and several other factors, so that I don’t have to do all the calculations by hand each time. If you want, I could mail it to you.

    • Tricky Dicky
      Participant
      Post count: 4

      Hi Peter,

      Sorry for not coming back to you sooner, I was out of contact for a while.

      Yes, I would be interested in your spread sheet. My email address is:

      [email protected]

      Thanks,

      Dick.

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