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What dovetail for a 12" lx90? plus, can you change the focuser?

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7 replies to this topic

#1 fieldsweeper

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Posted 23 April 2024 - 01:02 PM

Hello,

 

Thinking of deforking my forking 12" lx90,. because the forking thing is lame in alt az haha. .. jokes aside, I can't seem to really decide. Vixen or losmandy?  I will have a CGX mount for another scope I MAY use just visually until I get a better mount, but everywhere I look it seems to show me a dozen different brackets and dovetails etc. Granted I think that one is the classic vixen, however can you change that? If not, that may just answer my question but if trhere is some adapter I can use for that mount for the time being, and just get a losmendy. Or if there is a bracket I may change out the other scope I am getting with the CGX. I know the 12 is pushing it on the CGX, should be fine visually, but plan will be to upgrade later on. (it's just the best mount coming in a package deal right now, compared to the alt az stock lx90 mount/tripod) Can't really tell what components I will need for either choice to mount on the lx90

 

Also a side question, can I add a focus lock? like the lx200? Or upgrade the focuser that perhaps allow it to be better at imaging if I decide to do some light AP with it? 
 

And what about a handle or rings around it? Make it easier to pick up/mount. 

 

thanks.


Edited by fieldsweeper, 23 April 2024 - 01:12 PM.


#2 DSOGabe

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Posted 23 April 2024 - 01:49 PM

Definitely want to go with the Losmandy rail for larger scopes for more stability. Vixen would be fine if it was an 8" scope.



#3 fieldsweeper

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Posted 23 April 2024 - 01:51 PM

Definitely want to go with the Losmandy rail for larger scopes for more stability. Vixen would be fine if it was an 8" scope.

I figured, I just can't seem to find the right components anywhere. Either it's just one random plate no brackets etc, so idk what I need to buy to mount on that OTA for the lx90 12"


Edited by fieldsweeper, 23 April 2024 - 01:51 PM.


#4 Daveatvt01

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Posted 23 April 2024 - 02:22 PM

https://www.astronom...-meade-sct.html



#5 fieldsweeper

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Posted 23 April 2024 - 02:47 PM

I saw that one, all the others look like no brackets, or less "features, like the measure on the side, or different / less holes, and that one is out of stock haha. found it on the losmandy site and just ordered it. 

 

Thanks.

 

 

Any thoughts on the focuser though? an upgrade to the lx90 version? 


Edited by fieldsweeper, 23 April 2024 - 02:51 PM.


#6 Kitfox

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Posted 23 April 2024 - 03:08 PM

This is what's on mine:

 

https://store-losman...tores.com/dm-12

 

Shows instock!

 

 

Edit...Oops, you got it before I got to tell you!


Edited by Kitfox, 23 April 2024 - 03:09 PM.


#7 Daveatvt01

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Posted 23 April 2024 - 04:15 PM

I have SCT's up to 10", and if everything is the same or similar enough- as far as upgrading the focuser, ~in order from cheapest to most expensive:

Peterson kit: https://petersonengi...m/ez-focus-kit/

External crayford focuser: https://optcorp.com/...ford-dual-speed

Meade electronic focuser: https://www.meade.co...cro-focuser.pdp

Feathertouch SCT focuser: https://www.starligh...ain-telescopes/

There are more too, I'm sure.

 

I have had scopes with all of these except the starlight. The Peterson kit helps with image shift during focusing, and the external focusers eliminate image shift during focusing since the primary is stationary. With the electronic one you can use computer + software to find best focus too.

The mirror will also move some as you slew or track objects across the sky, which is known as mirror flop. Focusers will not help with that. I believe mirror lock would, but don't know if there's a way to add a mirror lock.


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#8 fieldsweeper

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Posted 23 April 2024 - 08:01 PM

I have SCT's up to 10", and if everything is the same or similar enough- as far as upgrading the focuser, ~in order from cheapest to most expensive:

Peterson kit: https://petersonengi...m/ez-focus-kit/

External crayford focuser: https://optcorp.com/...ford-dual-speed

Meade electronic focuser: https://www.meade.co...cro-focuser.pdp

Feathertouch SCT focuser: https://www.starligh...ain-telescopes/

There are more too, I'm sure.

 

I have had scopes with all of these except the starlight. The Peterson kit helps with image shift during focusing, and the external focusers eliminate image shift during focusing since the primary is stationary. With the electronic one you can use computer + software to find best focus too.

The mirror will also move some as you slew or track objects across the sky, which is known as mirror flop. Focusers will not help with that. I believe mirror lock would, but don't know if there's a way to add a mirror lock.

ah ok, I thought the mirror lock was on the focuser knob, but maybe not,  I think on celestrons they are other knob(s) but thanks, wasn't sure if there was a way to "upgrade" the lx90 into the 200 or even better lol. 




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