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Are There Any 1.25" Crayford Focusers For a Refractor?

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#1 sojourneyer

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Posted 19 January 2020 - 07:10 PM

All the Crayford focusers I have found for refractors are 2" with a 1.25" adapter.

Are there any Crayfords that are 1.25" only?

 

 

 

Thanks



#2 swsantos

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Posted 19 January 2020 - 07:51 PM

Starlight Instruments makes 1.25” focusers I have one on my 50mm Lunt

 

http://starlightinst...ory&path=37_109

 

 



#3 sojourneyer

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Posted 19 January 2020 - 07:58 PM

thank you Steve



#4 Jon Isaacs

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Posted 20 January 2020 - 11:34 AM

1.25 inch Crayfords are few and far between.  If your scope is capable, a 2 inch GSO Crayford is probably your best bet.

 

Jon



#5 plyscope

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Posted 20 January 2020 - 03:00 PM

Agena has this GSO 1.25 inch crayford. Looks like it is aimed at small newtonians however you may be able to adapt it to a refractor.

 

https://agenaastro.c...ngle-speed.html



#6 LDW47

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Posted 20 January 2020 - 04:01 PM

Agena has this GSO 1.25 inch crayford. Looks like it is aimed at small newtonians however you may be able to adapt it to a refractor.

 

https://agenaastro.c...ngle-speed.html

How would you do that, in your opinion ?


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#7 plyscope

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Posted 20 January 2020 - 06:05 PM

It looks like the base plate could be removed by undoing the small grub screws. See the photo in the link that shows the focuser upside down.

 

Then you would need to make an adapter to suit the telescope you intend to use it on.

 

I have made adapters for the 2" GSO focusers to suit home made refractors.

 

4619861-Istar%20scope%20build%20113.jpg

 

4619859-Istar%20scope%20build%20112.jpg

 

90f1500.jpg

 



#8 sojourneyer

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Posted 20 January 2020 - 06:32 PM

Andy, what you have done is very impressive but it is a 2" crayford. You can purchase them anywhere.

I was asking about a 1.25" crayford.

You can get them for reflectors but for refractors it is a completely different story



#9 sojourneyer

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Posted 20 January 2020 - 06:33 PM

How would you do that, in your opinion ?

I agree. It would take a lot of work to re-engineer something like that



#10 LDW47

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Posted 20 January 2020 - 07:13 PM

Its always so easy and talk is cheap, lol ! Be my guest and let me know how you make out !



#11 SonnyE

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Posted 20 January 2020 - 08:01 PM

Wow!

I hit the Motherload!

 

1.25 Crayford Focuser



#12 sojourneyer

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Posted 20 January 2020 - 08:02 PM

Wow!

I hit the Motherload!

 

1.25 Crayford Focuser

so funny... these are either for reflectors or 2 inch crayfords... That was the first place I went before my post.lol.gif



#13 SonnyE

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Posted 20 January 2020 - 08:04 PM

so funny... these are either for reflectors or 2 inch crayfords... That was the first place I went before my post.lol.gif

Well, sucks.

I tried. At least I didn't hit Crawdads. lol.gif wink.gif


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#14 Jon Isaacs

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Posted 21 January 2020 - 01:30 AM

so funny... these are either for reflectors or 2 inch crayfords... That was the first place I went before my post.lol.gif

 

Why not go with a 2 inch Crayford?

 

Jon



#15 sojourneyer

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Posted 21 January 2020 - 12:29 PM

Why not go with a 2 inch Crayford?

 

Jon

The draw tube can not accommodate 2 inches



#16 Jon Isaacs

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Posted 21 January 2020 - 01:33 PM

The draw tube can not accommodate 2 inches

 

The drawtube is part of the focuser.  Do you mean the diameter of the optical tube is not large enough to accommodate a 2 inch focuser?

 

What scope is this for?

 

Jon



#17 sojourneyer

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Posted 21 January 2020 - 01:52 PM

The drawtube is part of the focuser.  Do you mean the diameter of the optical tube is not large enough to accommodate a 2 inch focuser?

 

What scope is this for?

 

Jon

correct Jon

It is a little 80 mm I got f/6
 



#18 Jeff Struve

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Posted 23 January 2020 - 08:38 AM

correct Jon

It is a little 80 mm I got f/6
 

I'm still not getting this... my 80mm f6 uses a 2"




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