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Alter MN56 Focuser Replacement

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#1 badgerman17

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Posted 10 January 2020 - 07:24 PM

I bought an used Alter MN56 about 15 years ago before I went on astronomy hiatus due to employment relocation.  I'm getting back into astronomy as retirement approaches.  I have been messing with the Alter and now remember that I has to use a 1 1/4"helical focuser with the scope focuser to be able to reach focus with my eyepieces.  I would like to replace the stock Alter focuser with a 2" focuser with or without an extension so I can use my 2" eyepieces.  Any recommendations?



#2 luxo II

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Posted 10 January 2020 - 08:05 PM

There's a low profile 50mm high Crayford for 2" here

https://www.teleskop...0mm-height.html

 

Add a base to suit your OTA diameter.

 

There's another https://www.teleskop...er---short.html



#3 coopman

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Posted 10 January 2020 - 08:31 PM

I have an MN66 and replaced the stock "leaning tower of pizza" focuser with a single speed JMI focuser.

#4 photoracer18

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Posted 14 January 2020 - 03:43 PM

Hmmmm. My MN56 has the standard low profile Intes Micro 2" Crayford focuser, similar to the one my Intes MK-67 had except shorter (MK-67 now has a 2" Feathertouch on it). If you had to add another focuser on it in the drawtube why did you not just add 2" extension tubes instead? I know JMI and Moonlite made/make adapters for the MN56. Starlight does not mention one however I have found that some of their adapters will also fit other scopes they don't mention. They do make an adapter for the MN84. I think that one uses a 3.076" opening on the scope side. I plan on doing the measurements on mine to see what adapter may fit. I know the JMI just uses a flat focuser base on the IM tube adapter. I have a Starlight flat adapter on one of my 2" FT focusers but I have not looked to see if the holes line up.




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