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2-in focuser fit on a 10-in meade starfinder without any modifications or or drilling required? drilling

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#1 RunaboutCJ

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Posted 06 April 2021 - 01:15 PM

I have a 1994 10 inch EQ. has the original crap focuser on it looking for something else but I don't want to get into having to drill holes and that sort of thing. Wondering if there's something that will fit the existing holes.

Many many thanks

#2 apfever

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Posted 06 April 2021 - 02:50 PM

Pictures and hole pattern measurements.

 

These scopes often had a high focuser. You might have a focus problem if you replace one with a modern low profile focuser. 


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#3 Jim T

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Posted 06 April 2021 - 05:56 PM

Many years ago I replaced the crappy plastic 2" focuser on my 16" Meade Starfinder with a generic rack-and-pinion 2" from Orion.  The holes lined up distance-wise, but they were at a slightly different angle (like for a tube for an 8 or 10 inch scope).  A very small modification with a drill bit, touched up inside with some flat black paint.  Currently from Orion they only have a 2" Crayford, but it appears to be normal height and not low-profile, which is good.  You are not likely to find much experience from people compared to what is available from retailers today.  So very many of those old Starfinders got eventually re-built, mostly as truss style.  I practically wore the tube off of mine shoving it in and out of my car, and also the particle mirror cell board eventually warped.  I was very glad to give the heave-ho to that nasty spider/secondary combo that made collimation such a hated task.  If yours is still in good shape it must have been stored in the house and not used on many humid autumn evenings.



#4 RunaboutCJ

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Posted 15 April 2021 - 10:12 AM

Thanks

#5 sdedalus83

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Posted 15 April 2021 - 11:11 AM

I’ve got a focuser from a DS10 and a Nihon Seiko focuser like the ones University Optics sold. The screw-on eyepiece holders are interchangeable and all of the other dimensions are close, if not the same. The NS focuser would need a 2.5” hole, with mounting holes spaced 1 9/16” between holes on each side and 2.75” from side to side.



#6 LDW47

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Posted 15 April 2021 - 12:21 PM

Check out Agena Astro’s focuser page on sizing replacements, you will gain a lot of information that should help you determine the extent of what is required. It even has personal experiences / comments from fellow astronomers.


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