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36801Re: Field flattener for TMB 92 SS?

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  • digidodi
    Oct 12, 2010
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      Answering my own question... Issue solved. Due to the much shorter f-value versus the other refractor I had to shift the camera 20mm away from the flattener. Now (at least on a brick wall), the combination works *much* better. Nice.

      Dodi


      --- In tmboptical@yahoogroups.com, "digidodi" <ddierick@...> wrote:
      >
      > Hi,
      >
      > Has been a very long time since I posted something, but due to work I became an amateur-amateur with little time to do astronomy. Tonight was an exception :)
      >
      > Anyone has had success with 35mm format on the TMB 92SS? I tried tonight to couple a Teleskop Service (Germany) 2.5" field flattener that I had sitting on a shelf to a TMB 92SS and use a Canon 5DmkII, but the results were not up to standard. Perhaps only 50% of the field of view is really good. With my EOS 1DmkIV (crop 1.3) that goes up to 80% or so, but still not better.
      >
      > The same flattener works like a charm for the 5D on a 90mm f6.7 triplet apo with stars nearly pinpoints to the edge of the 24x36mm field.
      >
      > I tested the 92mm TMB also visually. Really nice scope indeed. Too bad about the photographic performance with the flattener. But perhaps better exist? Any suggestions?
      >
      > Tx
      >
      > Dodi
      >
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