#1  
Old 11-03-2015, 01:41 PM
Eden's Avatar
Eden (Brett)
Registered Rambler

Eden is offline
 
Join Date: Jan 2014
Location: Melbourne, Australia
Posts: 399
QHY12 CCD Glass Transmission Data

QHY-CCD kindly provided me with the optical transmission data for the UV/IR blocking glass which covers the CCD sensor on their QHY12 camera. It's likely that the same glass is used on their other one-shot color models.

I am posting it here in case anyone is interested in the numbers.
Attached Thumbnails
Click for full-size image (QHY12IR.wls.JPG)
86.0 KB27 views
Reply With Quote
  #2  
Old 11-03-2015, 02:56 PM
Amaranthus's Avatar
Amaranthus (Barry)
Thylacinus stargazoculus

Amaranthus is offline
 
Join Date: Jan 2014
Location: Judbury, Tasmania
Posts: 1,202
Useful, thanks. I wonder what that resonance at around 320 nm
is?

(BTW, I'll answer your PM when I get back to my computer, too long to type on an iPhone!)

Last edited by Amaranthus; 11-03-2015 at 04:08 PM.
Reply With Quote
  #3  
Old 11-03-2015, 03:51 PM
Eden's Avatar
Eden (Brett)
Registered Rambler

Eden is offline
 
Join Date: Jan 2014
Location: Melbourne, Australia
Posts: 399
Hi Barry,

Thanks very much, I appreciate it.

The UV/IR coverage on this glass allows some UV light from 320nm to 350nm and then from 380nm to 400nm to reach the sensor. I suspect that this can lead to star bloating in long exposures if it is not blocked by another filter.

Many of the light pollution and band-pass filters available are advertised with transmission graphs showing zero or near-zero transmission across the UV.

When these filters are tested by independent third-parties, the resulting transmission graphs often tell a very different story by showing that at least some UV light passes through, in varying quantities. I recently switched to an Astronomik CLS and found that it is definitely one filter that performs as advertised.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 07:44 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
OzScopes Authorised Dealer
Advertisement
Lunatico Astronomical
Advertisement
Bintel
Advertisement
SkyWatcher Australia
Advertisement
Celestron Australia
Advertisement
Meade Australia
Advertisement
NexDome Observatories
Advertisement
Astronomy and Electronics Centre
Advertisement