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Thread: Need help regarding an Apo-Rodagon 150mm f/4

  1. #21

    Join Date
    Sep 2017
    Posts
    4

    Re: Need help regarding an Apo-Rodagon 150mm f/4

    You are right, what I mean is fixed aperture. My apologies, but English is not my native language. I have a "fixed" aperture. I rated it F11. My lens looks exactly the same as the lens on the photos earlier in this topic. The front lensgroup can be unscrewed from the rear lensgroup and this is the location where my flimsy thin aperture disk is located. This is also where SKGRIMES makes the slot for the waterhouse stop adjustment. There is a small elevated rim to position the aperture disk and a metal ring to fill up a gap. I will take a picture later on and do some measurements on the aperture disk.

  2. #22

    Join Date
    Feb 2010
    Posts
    893

    Re: Need help regarding an Apo-Rodagon 150mm f/4

    You really shouldn't stop this lens down below f/5.6 if you want the best results. At f/11 you may as well be using any 150mm lens.

  3. #23

    Join Date
    Jan 2013
    Location
    Madisonville, LA
    Posts
    1,403

    Re: Need help regarding an Apo-Rodagon 150mm f/4

    Quote Originally Posted by EdSawyer View Post
    You really shouldn't stop this lens down below f/5.6 if you want the best results. At f/11 you may as well be using any 150mm lens.
    +1! Maybe f/8. Hard to Focus at f/ 11. And just think they probably paid five times the price of a Rodagon.

  4. #24

    Join Date
    Sep 1998
    Posts
    10,360

    Re: Need help regarding an Apo-Rodagon 150mm f/4

    Quote Originally Posted by EdSawyer View Post
    You really shouldn't stop this lens down below f/5.6 if you want the best results. At f/11 you may as well be using any 150mm lens.
    Optimal aperture is 1 to 2 stops down! Not wide open!

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