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Walking on the Moon

Upgrading my focuser


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I have this Skywatcher 150 with a 1.25 focuser, the hole centres of the screws on the horizontal across the top are approx 68mm, and I'd like to fit a dual speed focuser to it. 

I've contacted the UK importers who say they have nothing available, does anyone know of anything that might do the job? 

IMG_20221104_155808.thumb.jpg.71a16e84ff2d94859780e4ce36b188e9.jpg

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I have a 150mm f/5, just like your own, with a 1.25" as well...

2007636634_6f5b.jpg.77fb9a097bf117254e17567967a8d847.jpg

If you're wanting to fit a 2" dual-speed, the existing secondary-mirror may not fully illuminate 2" eyepieces.  When going from a 1.25" focusser to a 2", it is assumed that 2" eyepieces will be used.  The secondary-mirror may need to be larger for that usage, hence, replaced in addition.  Of course, that can always be postponed, or omitted if using only 1.25" eyepieces with the micro-focus...

https://www.aliexpress.com/item/4000256486538.html?pdp_npi=2%40dis!USD!US %24119.19!%24113.23!!!!!%402103222516697607147454503ea13d!10000001045732238!btf&_t=pvid%3A91d01b78-d1cb-4bc0-a24b-e64ff8482d0d&afTraceInfo=4000256486538__pc__pcBridgePPC__xxxxxx__1669760715&spm=a2g0o.ppclist.product.mainProduct&gatewayAdapt=4itemAdapt

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On 30/11/2022 at 11:38, imakebeer said:

This doesn't answer your question but while searching for something else I stumbled upon this article on Astro Baby's website which might at least help you get the most out of your current focuser:

https://www.astro-baby.com/Skywatcher Focuser Tune up/Skywatcher Focuser Tune-up.htm

🔭👍

That looks like a good idea, I've got exactly the same grease lying around from my cycling days. 

Edited by stephec
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1 hour ago, wookie1965 said:

I’m not sure that the Lacerta will fit that focuser. Eg looking at the picture the focus locking thumb screw is on the opposite side. 

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54 minutes ago, wookie1965 said:

You can fit these left or right 

Indeed, I have a Lacerta. But is his focuser even a Crayford? The Skywatcher Crayford on my 200p has a distance of 85mm between its fixing screws. The OP says his are 65mm. It could be a rack and pinion like this…

https://www.rothervalleyoptics.co.uk/skywatcher-1252-rack-pinion-focuser.html

If it’s a Crayford then the Lacerta should fit and would be a good solution. If not then it won’t!

Edited by PeterStudz
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5 hours ago, PeterStudz said:

Indeed, I have a Lacerta. But is his focuser even a Crayford? The Skywatcher Crayford on my 200p has a distance of 85mm between its fixing screws. The OP says his are 65mm. It could be a rack and pinion like this…

https://www.rothervalleyoptics.co.uk/skywatcher-1252-rack-pinion-focuser.html

If it’s a Crayford then the Lacerta should fit and would be a good solution. If not then it won’t!

That's what it is, but a 1.25 size only. 

 

I like the look of the Lacerta but it says for 200mm and above, mine's only a 150mm.

 

 

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