Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

How to tell if a LX90 has the ACF.

  • Please log in to reply
3 replies to this topic

#1 737mechanic

737mechanic

    Lift Off

  • -----
  • topic starter
  • Posts: 14
  • Joined: 04 Mar 2024

Posted 23 March 2024 - 11:16 AM

I bought a used Meade LX90 and the manual that came with it says ACF on it but the telescope itself does not say ACf anywhere on it. The question I have is do ALL LX90 with ACF have it printed on the telescope or were there some that did not have it printed on them?

 



#2 carolinaskies

carolinaskies

    Fly Me to the Moon

  • *****
  • Posts: 5,278
  • Joined: 12 Dec 2014
  • Loc: Greenville SC

Posted 23 March 2024 - 03:11 PM

I bought a used Meade LX90 and the manual that came with it says ACF on it but the telescope itself does not say ACf anywhere on it. The question I have is do ALL LX90 with ACF have it printed on the telescope or were there some that did not have it printed on them?

Not all LX90s had ACF optics, when they first came out they were standard.  It wasn't until 2009 that Meade switched production for LX90s to the ACF optics discontinuing the older classic optics.  ACF designation in the manual may have nothing to do with your telescope itself, as ACF pertains to optics only.    Look at the corrector retaining ring to see if there is an ACF on it.  You could also take the plastic cover of the Dec arms and see what the PCBs are dated, If they are 2009 or newer you probably have the ACF.  Another test would be to use a low power eyepiece and observe the outer edge of a starfield for coma.    



#3 michael8554

michael8554

    Skylab

  • *****
  • Posts: 4,039
  • Joined: 19 Aug 2020
  • Loc: Wiltshire UK

Posted 24 March 2024 - 05:30 AM

If it's an ACF it should have "ACF2 in red letters on the side of the OTA.

 

And "Advanced Coma Free" on the front corrector ring.


  • Skywatchr likes this

#4 Bill Barlow

Bill Barlow

    Fly Me to the Moon

  • *****
  • Posts: 6,417
  • Joined: 03 Dec 2007
  • Loc: Overland Park KS

Posted 30 March 2024 - 11:51 AM

If it is the newer textured blue paint finish, then it is an ACF.  The glossy blue tubes had the ACF in the mid to late 2000’s I believe.   So most likely it is an ACF.  
 

Bill




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics