2" EFW Telescope OAG opening

robertm

Hi,

The unobstructed opening of the FW side of the M68 OAG looks to be about 55mm, can you confirm that will be the same on the front of the 2" filter wheel i.e. a 55mm opening to match. I have an f/3 telescope and need to know that the full frame sensor on the ASI6200 won't be vignetted at that focal ratio. The front opening of the filter wheel (where it mates with the M68 OAG) needs to have an unobstructed diameter of no less than 55mm to work with my telescope.

Many thanks

Robert

katherine.tsai

Hi Robert,

You can check this product.

https://astronomy-imaging-camera.com/product/m68-oag-off-axis-guider

robertm

Thank you Katherine for the reply.

The question was regarding the telescope side of the filter wheel and not the OAG !

The M68 telescope side of the OAG is fine but that’s of no use if the rest of the openings are undersize.

I can post a picture if that helps.

Kind regards

Robert

katherine.tsai

Both thread are M54*0.75.

robertm

Thank you Katherine,

Are ZWO planning to have an option for a larger opening or if not then would it be possible to order a spare 2” EFW front plate so I can adapt it myself ?

Many thanks

Robert

katherine.tsai

https://astronomy-imaging-camera.com/tutorials/connection-methods-of-asi6200mm-pro-2-efw-and-m68-oag.html