Mounting a 72mm lens to Durst 138

Discussion in 'Darkroom Equipment' started by Silverpixels5, Mar 20, 2006.

  1. Silverpixels5

    Silverpixels5 Member

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    Do they make 72mm mounting rings for the Durst 138? I have a 240mm Rodagon which requires a 72mm threaded ring. The Durst ring mount is 77mm, which only leaves 2.5mm of ring thickness. Is it possible to mount this lens?
     
  2. Donald Miller

    Donald Miller Member

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    Ron,

    According to the Durst 138S and 138 manual the Rodagon 240 was only used on the 138S with point light source and the condensers specified for this application were the 240 PT upper and 240 T lower condensor for this application with this lens. The limits of linear magnification are 4.4X to 22.4 X with this lens and condenser combination from a 5X7 negative.

    I thought that you were going with the 180 Rodagon. That lens calls for the following condenser combination on the 138S 240 upper and 240 H lower. Althought the 240 T that you have would work since the coating would cause no harm.

    The lens board that you will need to locate for the 240 Rodagon is a Roding 72 to be mounted on the Unipla or Tripla turret. My 240 Componon S is a Durst mount and I am not sure that it is the same as a conventional 240 Componon that you would purchase for another enlarger application.

    Good luck.
     
  3. Silverpixels5

    Silverpixels5 Member

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    Donald:

    I did go with the 180 Rodagon, which should hopefully be here by Wednesday. Although I was able to get the 240 lens at a very good price so I bought it as a backup. If i can't use it then I shouldn't have any problem passing it on. Thanks for the info!

    Ron