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Thread: Can the lomo RF3 process lens be reversed?

  1. #1

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    Can the lomo RF3 process lens be reversed?

    Hi everyone, Arne and Dan,

    I read that the lomo RF3 300mm f/10 process lens is a 6/4 double gauss type - does anybody have a diagram of that construction? Is it completely symmetrical? If so I can easily mount it in reverse on my new lens board for landscape work. I have done this with my schneider angulon 120mm f/6.8 with very good results.

    Cheers Peter Kinchington - peterk.2ya.com

  2. #2

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    Re: Can the lomo RF3 process lens be reversed?

    Peter, you can ask the lens whether it performs differently mounted normally and reversed. You can also ask the cells whether they have the same focal lengths.

    The 1971 Yakovlev catalog (see the list) shows a cross-section. More-or-less symmetrical, perhaps not perfectly.

  3. #3

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    Re: Can the lomo RF3 process lens be reversed?

    Dan does this mean the lens will perform the same mounted normally or reversed? I will give it a go if it is almost symmetrical.
    Thanks Peter

  4. #4

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    Re: Can the lomo RF3 process lens be reversed?

    It should, but you can test. Hang it in front of a DSLR or a film SLR.

  5. #5

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    Re: Can the lomo RF3 process lens be reversed?

    Will do.
    Bye Peter

  6. #6

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    Re: Can the lomo RF3 process lens be reversed?

    Quote Originally Posted by peterkinchington View Post

    I read that the lomo RF3 300mm f/10 process lens is a 6/4 double gauss type[/URL]
    Here, page 27 bottom, there is information about your lens. http://www.arnecroell.com/eastern-bloc-new.pdf

    It is described as "Apo-Planar type process lenses" , 35lp/mm in the center and the 18lp/mm in the corner, 497(1:1)mm circle.

    https://en.wikipedia.org/wiki/Zeiss_Planar
    https://en.wikipedia.org/wiki/Double-Gauss_lens

    Zeiss Planar family started in 1896 as a D gauss derivative, I guess.

  7. #7

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    Re: Can the lomo RF3 process lens be reversed?

    Quote Originally Posted by Pere Casals View Post
    Here, page 27 bottom, there is information about your lens. http://www.arnecroell.com/eastern-bloc-new.pdf

    It is described as "Apo-Planar type process lenses" , 35lp/mm in the center and the 18lp/mm in the corner, 497(1:1)mm circle.

    https://en.wikipedia.org/wiki/Zeiss_Planar
    https://en.wikipedia.org/wiki/Double-Gauss_lens

    Zeiss Planar family started in 1896 as a D gauss derivative, I guess.
    Thanks Pere

  8. #8

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    Re: Can the lomo RF3 process lens be reversed?

    Photo of Treeferns in Mountain Ash Forest taken with reversed RF3. 15min@f/90 with fomapan 100.
    Click image for larger version. 

Name:	Treeferns+Mountain_Ash_1000pix.jpg 
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    peterkinchington.com

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