View Single Post
  #1  
Old 02-07-2017, 06:13 PM
Stevec35 (Steve)
Registered User

Stevec35 is offline
 
Join Date: Aug 2010
Location: Canberra
Posts: 3,654
Trifid in near infrared

This is something different and slightly experimental so don't judge too harshly. A few years I bought some Astrodon infrared filters and this is one of the few times I've used them. Basically these filters have the following characteristics:

Luminance - only passes greater than 700nm
Red - a band centered on 850nm
Green - a band centered on 830nm
Blue - a band entered on 750nm

You will notice that the bright stars look pretty messy. According to Don Goldman that's because the anti-reflection coatings on the CCD cover slip are only optimized for visible light and not infrared.

Anyway here's the image:

http://members.pcug.org.au/~stevec/M...L6303_RC14.htm

Steve
Attached Thumbnails
Click for full-size image (m20_STXL6303_RC14_IR_LRGB_small2.jpg)
163.1 KB87 views
Reply With Quote