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Old 27-01-2021, 06:56 PM
chooch65 (Amir)
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trouble shooting

hi all i need your help
i have a saxon 127mm refractor and an asi1600mm cooled camera. i have purchased a saxon 0.7 reducer flattener. i can get focus with 55mm and 56mm but the stars on the outer edge are kind of stretched. i can NOT get the flattener to work for me. any advice will be much appreciate it
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Old 27-01-2021, 10:02 PM
Zuts
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Hi, I may be wrong but my understanding is you need 55mm from the reducer surface which is closest to the camera to the chip surface.

Cheers
Paul
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Old 29-01-2021, 10:12 AM
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gregbradley
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Yes the reducer needs the correct spacing. The spacing distance is usually specified for a particular reducer. Do you know what it is for this reducer?

Its called metal back distance which is the distance from the sensor to the end of the metal casing (not including the thread) of the reducer.

You can get variable spacing adapters so you can trial and error it and move the spacer within a range of movement. Teleskop Services sells some.

Greg.
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Old 29-01-2021, 10:30 AM
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Merlin66 (Ken)
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Check out these diagrams from Baader:
Too close a spacing and too much a spacing.
Attached Thumbnails
Click for full-size image (spacing-tooclose.jpg)
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Click for full-size image (spacingtoomuch.jpg)
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