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

Chroma Filters in ZWO EFW - 36mm

  • Please log in to reply
8 replies to this topic

#1 Jeff Morgan

Jeff Morgan

    Voyager 1

  • *****
  • topic starter
  • Posts: 12,853
  • Joined: 28 Sep 2003
  • Loc: Prescott, AZ

Posted 24 February 2021 - 09:45 PM

I'm thinking about not getting the ZWO bundled SHO 7nm filters and upgrading to Chroma 3nm filters.

 

The Catch: ZWO recommends filter thickness between 1.5mm and 3.0mm and the Chroma spec is 1mm.

 

Is anyone using this combo? Did you shim the filters, or everything just worked out ok?



#2 Joe G

Joe G

    Surveyor 1

  • *****
  • Posts: 1,992
  • Joined: 10 Jan 2007
  • Loc: Southern California

Posted 24 February 2021 - 10:16 PM

I wouldn't Rush into that decision.lol.gif


  • Jeff Morgan likes this

#3 Cometeer

Cometeer

    Mercury-Atlas

  • *****
  • Posts: 2,692
  • Joined: 07 Aug 2013
  • Loc: SF Bay Area, California or Illinois

Posted 24 February 2021 - 10:25 PM

Chromas (at least the ones sought for AP) are 3mm thick. 


  • scadvice likes this

#4 scadvice

scadvice

    Vanguard

  • *****
  • Vendors
  • Posts: 2,329
  • Joined: 20 Feb 2018
  • Loc: Lodi, California

Posted 24 February 2021 - 10:53 PM

They are 3mm the 1mm most likely refers to the change in Back Focus (+ 1mm).



#5 Pete_xl

Pete_xl

    Apollo

  • -----
  • Posts: 1,244
  • Joined: 29 Jan 2015
  • Loc: Germany

Posted 25 February 2021 - 01:06 AM

I have a 3nm OIII filter in my combo among Astronomiks and Baaders. No problems so far.



#6 imtl

imtl

    Gemini

  • *****
  • Moderators
  • Posts: 3,479
  • Joined: 07 Jun 2016
  • Loc: Down in a hole

Posted 25 February 2021 - 04:24 AM

Chroma are 3mm thick.



#7 Pete_xl

Pete_xl

    Apollo

  • -----
  • Posts: 1,244
  • Joined: 29 Jan 2015
  • Loc: Germany

Posted 25 February 2021 - 07:58 AM

Chroma are 3mm thick.

Nevertheless they fit into the wheel.

#8 Jeff Morgan

Jeff Morgan

    Voyager 1

  • *****
  • topic starter
  • Posts: 12,853
  • Joined: 28 Sep 2003
  • Loc: Prescott, AZ

Posted 25 February 2021 - 01:04 PM

Thanks everyone!

 

That 1mm sounded awfully thin - must be focus shift. Especially since Chroma owners have chimed in at 3mm.

 

And yes, I will take a deep breath before ordering. I have kind of gotten the bug after doing some cell phone images through my night vision eyepiece. I think I will find "real" imaging to be a lot of fun. Nevertheless I will consider the wisdom of going with the basic 7nm set first.



#9 Der_Pit

Der_Pit

    Vanguard

  • *****
  • Posts: 2,181
  • Joined: 07 Jul 2018
  • Loc: La Palma

Posted 25 February 2021 - 04:37 PM



That 1mm sounded awfully thin - must be focus shift. Especially since Chroma owners have chimed in at 3mm.

However, there are filters that are only 1mm thick:  Astronomik.  I'm also thinking what to get for the new 36mm wheel.  I think I'll stay with Astronomik (I have the 31mm ones ATM, and am really happy with them), and 3D-print some distance rings...




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