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LX90 mods

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23 replies to this topic

#1 Scott Rose

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Posted 23 February 2018 - 09:40 AM

I just purchased an 8" LX90.  What accessories or mods have you found useful.  Thanks for any suggestions and input.

Scott



#2 junomike

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Posted 23 February 2018 - 09:47 AM

For my SCT (ForkMounts) the necessities are a Dew Shield, battery source (port. battery or car/cigarette adapter) and a 2" Visual Back.


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#3 Knasal

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Posted 23 February 2018 - 09:52 AM

I’d add either a Telrad or Rigel Quick Finder, but others will debate this. 

 

Kevin


Edited by Knasal, 23 February 2018 - 09:55 AM.


#4 Joshiewowa

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Posted 23 February 2018 - 10:10 AM

I designed and 3D printed a larger focuser ring to slip over the stock one, it really helped with fine focus.

 

I built a ring and mount for my small scopes to mount on the LX90, for using both at the same time, and aligned with eachother.

 

A dew shield is invaluable, haven't gotten a power supply for mine yet, I'm sure that'd help too.

 

 

My next upgrade will be an addon Crayford focuser, I've heard it's a big help.


Edited by Joshiewowa, 23 February 2018 - 10:11 AM.


#5 Migwan

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Posted 23 February 2018 - 10:18 AM

A convenient as possible dark site.  

 

Eyepieces, diagonal, telrad and/or better finder scope.  Regarding eyepieces and without knowing what your have, try a wide angle mid to high power eyepiece.  I didn't get one till I got my 1100 and can not believe I didn't try them earlier.    I put a ST80 on my 2080, which served me well as a wide field finder scope.  The telrad came with the 2080 and I very happy to have it. Pretty darn useful.

 

Oh, Ohio, dew shield and probably dew strips a controller and power.   A moon filter too.

 

That said, you don't really need these upgrades to enjoy your LX90, save perhaps a nice dark site.  Enjoy.

 

jd


Edited by Migwan, 23 February 2018 - 10:21 AM.


#6 Creedence

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Posted 23 February 2018 - 10:57 AM

Quick question for those with the dew shield (hopefully a suppliment to the OP rather than a hijack).

Do you NEED to add counterweights with your dew shields installed, or do your fork mounts handle the shift in CG well enough?

I ordered a dew shield as one of my first upgrades, but I really felt I was stressing my drive motors too much, and I haven't used it since.

#7 rmollise

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Posted 23 February 2018 - 11:21 AM

Quick question for those with the dew shield (hopefully a suppliment to the OP rather than a hijack).

Do you NEED to add counterweights with your dew shields installed, or do your fork mounts handle the shift in CG well enough?

I ordered a dew shield as one of my first upgrades, but I really felt I was stressing my drive motors too much, and I haven't used it since.

 

You won't likely need a counterweight just because you added a dewshield. You really don't want alt/dec balance perfect anyway.



#8 JakeJ

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Posted 23 February 2018 - 11:32 AM

Focal Reducer!!!!



#9 Joshiewowa

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Posted 23 February 2018 - 11:41 AM

Focal Reducer!!!!

I have an LX90 ACF, do you know of a focal reducer compatible with it?



#10 JakeJ

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Posted 23 February 2018 - 12:38 PM

 

Focal Reducer!!!!

I have an LX90 ACF, do you know of a focal reducer compatible with it?

 

Here is the relevant information for you:  https://www.cloudyni...-focal-reducer/



#11 Peterson Engineering

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Posted 23 February 2018 - 12:40 PM

Hello Scott,

 

Congratulations.  Yours is a really nice scope.  As for upgrades, much depends upon where you're located and how you'll be using the scope. You've already spend some bucks on the scope, and if you go slowly you'll come to better appreciate each upgrade.

 

Pete Peterson


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#12 Creedence

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Posted 23 February 2018 - 01:18 PM


Focal Reducer!!!!

I have an LX90 ACF, do you know of a focal reducer compatible with it?

I have the 12" LX90, and I've been very happy with my Antares 6.3 focal reducer. Under visual use I've not seen any adverse impact whatsoever. I haven't tried imaging with it yet.

#13 M57Guy

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Posted 24 February 2018 - 12:09 AM

#1: 12V power supply - LX90 performance, including alignment, much improved over even fresh batteries

 

#2: red dot finder / telrad - a nice companion to the stock 8x50 optical finder. I like having both.

 

#3: dew shield - inexpensive and functional for both dew prevention and stray light

 

#4: Peterson EZ focus kit - http://www.petersone...z_focus_kit.htm

 

#5: 2" Diagonal - any decent 2" diagonal is an upgrade over the stock 1.25" diagonal


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#14 JakeJ

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Posted 24 February 2018 - 01:03 AM

 

 

#5: 2" Diagonal - any decent 2" diagonal is an upgrade over the stock 1.25" diagonal

8" SCT's don't really benefit from a 2" diagonal.



#15 junomike

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Posted 24 February 2018 - 09:22 AM

 

 

 

#5: 2" Diagonal - any decent 2" diagonal is an upgrade over the stock 1.25" diagonal

8" SCT's don't really benefit from a 2" diagonal.

 

IMO,  along with allowing for the use of long F/L 2" eyepieces the 2" Diagonal is also more secure over the cheaper OEM 1.25" Diagonal


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#16 M57Guy

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Posted 24 February 2018 - 10:45 AM

 

 

 

 

#5: 2" Diagonal - any decent 2" diagonal is an upgrade over the stock 1.25" diagonal

8" SCT's don't really benefit from a 2" diagonal.

 

IMO,  along with allowing for the use of long F/L 2" eyepieces the 2" Diagonal is also more secure over the cheaper OEM 1.25" Diagonal

 

Yes on both accounts. The stock diagonal on my LX90 had one tiny set screw for the EP and the stock visual back had one tiny set screw for the diagonal. I fond the 2" diagonal with compression rings a substantial improvement.


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#17 E Sully

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Posted 24 February 2018 - 12:27 PM

Dew heaters and shield.  Nothing annoys me more than when the view fades as dew forms.  The focal reducer is a good option

 

 

 

 

 

 

#5: 2" Diagonal - any decent 2" diagonal is an upgrade over the stock 1.25" diagonal

8" SCT's don't really benefit from a 2" diagonal.

 

IMO,  along with allowing for the use of long F/L 2" eyepieces the 2" Diagonal is also more secure over the cheaper OEM 1.25" Diagonal

 

Yes on both accounts. The stock diagonal on my LX90 had one tiny set screw for the EP and the stock visual back had one tiny set screw for the diagonal. I fond the 2" diagonal with compression rings a substantial improvement.

 

A good focal reducer and quality 1-1/4" diagonal will work well for an 8" SCT, I really see no compelling reason to use 2".  The cost and weight of 2" eyepieces will not be worth it in my opinion.  I would change my mind if it were a larger SCT.  I also bought the 1401 balance weights for my scope to even the load.


Edited by E Sully, 24 February 2018 - 03:11 PM.

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#18 JakeJ

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Posted 24 February 2018 - 01:54 PM

2" EPs are vignetted in an 8" sct due to the baffle tube - you actually lose light using them.  If you observe in light polluted skies the vignetting is quite obvious visually.

 

I agree the stock diagonal needs replaced.  I got a quality 1.25" Baader T2 diagonal with SCT fittings and compression EP holder - best investment I ever made for the 8", and much sharper images than the 2" dielectrics from China (I have several of those collecting dust).



#19 junomike

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Posted 24 February 2018 - 02:19 PM

2" EPs are vignetted in an 8" sct due to the baffle tube - you actually lose light using them.  If you observe in light polluted skies the vignetting is quite obvious visually.

 

I agree the stock diagonal needs replaced.  I got a quality 1.25" Baader T2 diagonal with SCT fittings and compression EP holder - best investment I ever made for the 8", and much sharper images than the 2" dielectrics from China (I have several of those collecting dust).

Never noticed this with my 31T5 in my Bortle 5 sky but others may see different (and that's fine)

Seeing as the C8 Baffle opening is 37mm however, that still leaves 10mm more (Field Stop size) over the largest 1.25" eyepiece @ 27mm.

Along with the 31T5 I found the 21E amazing in my 8" EdgeHD and with a FS of 36.2mm It totally clears the Baffle opening, offers more FOV than the 24mm Pan and at a higher magnification.........but requires a 2" Diagonal.

 

A much more popular choice (due to cost) is the 35mm Pan which also has a similar FS than the baffle opening @ 38.7mm



#20 will w

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Posted 24 February 2018 - 05:55 PM

Scott, You can find used 6.3 and 3.3 meade focal reducers used here on c/n . will w



#21 Scott Rose

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Posted 24 February 2018 - 07:52 PM

Thank you for all the responses.  One thing I am going to get is the Peterson Mounting assistant.



#22 Scott Rose

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Posted 24 February 2018 - 08:01 PM

I read that Optec has a reducer made for ACF optics. I will probably get that also. HOw have found the stock focuser on the scope.

#23 Phil Cowell

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Posted 24 February 2018 - 08:59 PM

Starlight micro focuser. It’s a huge improvement.



#24 jgraham

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Posted 24 February 2018 - 10:48 PM

Hmmm, my favorite LX90 mods include a dew shield, 2" visual back, diagonal, and eyepieces, a 50mm RACI finder (for going off-road), a comfy seat, a small table, a copy of The Pocket Sky Atlas, and a notebook.

 

My LX90/200 Mak 7...

 

LX90_200 Mak 7 (11-14-2017)-1j.jpg

 




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