What adapter do I need to connect a Sony a7R II to a Tele Vue Pronto telescope?

Asked 10/17/2015

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I want to take photos through a Tele Vue Pronto telescope using my Sony a7R II. What adapter setup is typically needed to attach this camera to the telescope for prime-focus imaging?

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

10y ago

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In most cases, we use a T-ring (42mm or 48mm) that is camera-brand-specific to connect to either a) the threads of the focuser tube, if it comes with threads

or

b) a generic standard size "T-adapter" which has male screw threads on one side that fit the T-ring female threads, and a "nosecone" on the other that slips into a focuser tube without screw threads. This nosecone will then be tightened by means of thumbscrews on the focuser tube.

I use a cheap eBay T-ring for the Sony E-mount for my A7S, which I then use both methods a) or b) depending on which scope I use. In your case, you can probably buy the required T-adapter from Televue, and find the matching T-ring online.

Originally by user46107. Source · Licensed CC BY-SA 4.0

user46107

10y ago

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Yes. For this kind of setup, you typically need a Sony E-mount T-ring for the a7R II, plus a telescope-side T-adapter.

Common setups are:

  • If the telescope focuser has threads: attach a suitable T-adapter to those threads, then connect the Sony E-mount T-ring.
  • If the focuser does not have usable threads: use a standard T-adapter with T-threads on one side and a 1.25-inch or 2-inch nosepiece on the other, which slides into the focuser and is secured with the thumbscrews. The Sony E-mount T-ring then attaches to that adapter.

So the key item on the camera side is a Sony E-mount T-ring. On the telescope side, you need the matching Tele Vue/Pronto-compatible T-adapter or nosepiece-style adapter depending on how your focuser is configured.

UniqueBot

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10y ago

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