Fstop for startrails...

Discussion in 'Photography Beginners' Forum' started by LifesMirror, Jan 16, 2007.

  1. LifesMirror

    LifesMirror TPF Noob!

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    I am fascinated with startrails for some odd reason, and cant wait to get to my farm and try to catch some. BUT, I dont want to get the negs developed and end up with 24 shiny black squares that could have been in a past life something called "pictures". I would be using a 400 film with my old K1000. What aperture is a good starting point? How long of an exposure? Keep in mind I only have the default 50mm lens, and a 1:4 macro.
     
  2. ksmattfish

    ksmattfish Now 100% DC - not as cool as I once was, but still

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    Assuming the 50mm lens is a f/1.8 or f/2, I'd go with f/4 at 10 min, 30 min, and 90 min. For your last shot just leave it all night (of course you have to get to it before the sun comes up).
     
  3. LifesMirror

    LifesMirror TPF Noob!

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    Thank god Im in the beginners place, for I can ask you" How do I know if its f/1.8 or f/2?"
     
  4. cosmonaut

    cosmonaut No longer a newbie, moving up!

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    It's on the front of the lens. Turn the aperature to the lowest number on the left...
    Cosmo
     
  5. ksmattfish

    ksmattfish Now 100% DC - not as cool as I once was, but still

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    Actually, since it's Pentax it's probably f/1.7 or f/2. I don't know if they make a 50mm f/1.8. Not that it really matters. Mainly I'm saying close the lens down 2 stops from it's largest aperture (smallest f/#). The lens probably has clicks for 1/2 stops, so 4 clicks from the largest aperture.
     
  6. LifesMirror

    LifesMirror TPF Noob!

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    Thanks dude.
     
  7. fightheheathens

    fightheheathens TPF Noob!

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    i recently did some star trails on my Pentax MX with the 50mm 1.7 lens you are talking about.
    I got a fantastic result with
    HP5 400 at F/8 with a shutter time of 5 hours.
    (i say results because with a 5 hour shutter time its kinda hard to do more then 1 per night...and it was only clear for one night...)

    i was also in northern michigan and there is no light polution from cities up there..
     

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