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

Lens Cap For 9 x 50mm Celestron finderscope

  • Please log in to reply
6 replies to this topic

#1 TedH

TedH

    Lift Off

  • -----
  • topic starter
  • Posts: 12
  • Joined: 15 Nov 2016

Posted 11 October 2019 - 07:40 AM

To fashion a solar filter for my Nextstar finder scope, I need a second lens cap.  I have the correct solar filter mylar from a supplier.  Anyone know where I might get one?  Inside dimension is 59mm.  Thanks, Ted   

Attached Thumbnails

  • 31-Unu4KpuL._AC_.jpg


#2 havasman

havasman

    Cosmos

  • ****-
  • Posts: 9836
  • Joined: 04 Aug 2013
  • Loc: Dallas, Texas

Posted 11 October 2019 - 08:27 AM

Agena Astro sells many sizes and several varieties of caps.


  • wrvond likes this

#3 junomike

junomike

    Hubble

  • *****
  • Moderators
  • Posts: 16923
  • Joined: 07 Sep 2009
  • Loc: Ontario

Posted 11 October 2019 - 12:24 PM

Strange as they list that Finder with a 57.2mm cap.dew Shield  which  Agena carries a 57mm cap.

Here's a 59mm Cap If you decide to go the "inside" way-

Either way, Make SURE it fits properly with no chance of accidentally falling off!



#4 Michael_Swanson

Michael_Swanson

    Vanguard

  • *****
  • Posts: 2331
  • Joined: 23 Apr 2003

Posted 12 October 2019 - 01:20 AM

Or just make the filter cell from poster board:

https://www.nexstars...roSolarFilm.htm

https://www.nexstars...-build_2017.pdf

 

I've made 5 or 6 of them and they are still going strong after nearly 20 years of use.

 

Best regards,
Mike Swanson
Author of "The NexStar User's Guide II"
Author of "The NexStar User's Guide"
Author of "NexStar Observer List"
https://www.NexStarSite.com


  • havasman likes this

#5 mclewis1

mclewis1

    Thread Killer

  • *****
  • Posts: 19043
  • Joined: 25 Feb 2006
  • Loc: New Brunswick, Canada

Posted 12 October 2019 - 06:22 PM

I made three the same way about 15 years ago. I added an "adapter" (foam insulation strip) to one and now they fit 4 of my scopes ... well actually 3 scopes and a finder. Simple, cheap, and so far have been very robust, and no front caps have been harmed.



#6 TedH

TedH

    Lift Off

  • -----
  • topic starter
  • Posts: 12
  • Joined: 15 Nov 2016

Posted 13 October 2019 - 06:38 AM

Thanks for all of the replies.  Hope to find one that works from the sources provided.  Yeah, I'm aware it has to fit exactly right so there is no chance of it coming off.  Made one for my previous Nexstar 8 and it worked fine for many years.  Best to all from the Midwest. 



#7 Jim4321

Jim4321

    Soyuz

  • -----
  • Posts: 3574
  • Joined: 19 Sep 2014
  • Loc: Asheville

Posted Yesterday, 08:04 AM

Summer of 2017, I made a solar finder cap from two cut-down spray can caps.  I found a pair in my junk box that fit snugly one inside the other, with the smaller one fitting snugly onto the 9x50 finder.  After I cut the ends out of both (Dremel tool with saw; leave a small lip on the larger one), I lightly taped a square of solar film over the smaller one, and glued it inside the larger one.  The edges of the film are captured between the caps, and are held quite securely by the glue and lip.  I strongly suspect that it's more durable than the slightly junky store-bought ones with the cardboard ring.

 

Yeah, I spend a silly amount of time avoiding spending ~$20.  But I enjoy small shop projects, and I'm retired... grin.gif

 

Jim H.


  • mclewis1 and Ssayer like this


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