Stacking Leica apo 2x extenders

Discussion in 'Leica and Rangefinders' started by raymond_tai, Mar 18, 2010.

  1. Has anyone ever stacked two apo 2x extenders? I have an apo 180mm f/2 Summicron-R and want to turn it into a 720mm and am wondering at the potential loss of quality. I have one apo 2x extender already and it is stellar.
  2. Be more concerned about the loss of light, given the 2x loss for each 2x extender added. I can't imagine the quality would be acceptable through a pair of converters, but have never tried that.
  3. I'm not sure about Leica extenders, but this is common practice with Canon and Nikon extenders. Results depend heavily upon
    the lens used.
  4. awahlster

    awahlster Moderator

    Results are more dependant on your ability to shoot with a 720mm lens you can't just put that on top of a tripod and lock it down and end up with a sharp photo. How is you long lens technic? Have you shot with a lens of this lenght before?
    Your gonna need shutter speeds of at least 1/250th to even have a chance. So you will be lucky on a nice brite day with fast film to be able to stop down 1-2 stops if that.
    I shoot with a Canon 500mm f4.5L S.S.C. and a 2X-A this ends up f9.0 and with 400 ASA it is still everything a guy can do to get a nice sharp photo 50 feet away. And I use a BIG ball head and a Berlebach Wooden 2pc leg tripod with over a 22kg rating.
  5. 1/250th ... wow that would be impressive, more like 1/2000th or less! I assume you mean 1/250th on a tripod?
  6. A friend of mine regularly shoots handheld with a 400/6.8 Telyt on a D700 at at least iso3200 so it is possible to use the resulting 720mm even on a monopod. It is probably not a good idea stacking 2 extenders anyway.

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