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

Help with focusing using a LS50T and ZWO ASI 183MC

Imaging Solar
  • Please log in to reply
3 replies to this topic

#1 mfratto

mfratto

    Sputnik

  • -----
  • topic starter
  • Posts: 45
  • Joined: 19 Dec 2017
  • Loc: Syracuse, NY

Posted 19 June 2022 - 03:33 PM

Folks, I have a

  • Lunt LS50 single stack with the
  • B600 blocking filter
  • and Feather touch focuser.

 

Visually, I am getting stunning views with a 12mm EP. However, I added my ASI 183MC with the standard 1.25" nose piece and I can't seem to get focus. I am using Sharpcap. I set the exposure to 25ms, 0 gain, no flats or darks, and bin 4 (bin 1 had a worse effect) which sets the histogram at about 75%. However, I am finding that I don't have enough in-travel to focus. Is the ASI 183MC just not the right camera for this use? Anything I can use to move the focal plane outward?

 

Thanks



#2 MalVeauX

MalVeauX

    Voyager 1

  • *****
  • Posts: 10,595
  • Joined: 25 Feb 2016
  • Loc: Florida

Posted 19 June 2022 - 03:35 PM

Hi,

 

Put a 2x barlow in front of your camera and it will achieve focus. It will also sample better at the longer focal-ratio.

 

Your 1" sensor can handle the disc image size with room to spare.

 

Very best,


Edited by MalVeauX, 19 June 2022 - 03:35 PM.

  • astro_1 and mfratto like this

#3 astro_1

astro_1

    Viking 1

  • -----
  • Posts: 635
  • Joined: 14 Aug 2014
  • Loc: USA, Nebraska

Posted 19 June 2022 - 03:51 PM

A possible option. I had a similar issue of not reaching inward focus with the 1.25” nose piece.

The eyepiece holder on the blocking filter unscrews exposing threads, lose the nose piece and thread the camera directly onto the blocking filter.


  • mfratto likes this

#4 mfratto

mfratto

    Sputnik

  • -----
  • topic starter
  • Posts: 45
  • Joined: 19 Dec 2017
  • Loc: Syracuse, NY

Posted 19 June 2022 - 06:49 PM

Thanks guys, I will try both.




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





Also tagged with one or more of these keywords: Imaging, Solar



Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics