It is currently Tue Oct 15, 2019 7:26 am


Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: Fri Jan 25, 2019 6:09 pm 
Offline

Joined: Tue Dec 05, 2017 11:53 am
Posts: 499
I have the ASI 178MM (for Solar) with my Daystar Ha.

The Mono camera has no IR filter (unless I am mistaken) and I removed the IR cut filter from my NexImage 5 camera understanding that imaging the Sun was better without them.

Therefore why would you add an IR blocking filter (other than to reduce heat) to a diagonal, surely that defeats the puropse of not having a filter in the camera ???, and under 80mm it is not needed anyway in the scope

Thanks

Attachment:
dq.jpg
dq.jpg [ 125.73 KiB | Viewed 682 times ]

_________________
Celestron 8" Edge HD Evolution, Esprit 120mm triplet, 72mm APO, Sky Tee 2, 6" reflecting scope, William Optics Binoviewer, Quark Daystar Ha Chromosphere on 72mm ED, LVW8mm eyepiece and Celestron 19mm Axiom, matched W.O 10 and 20mm, and a few others, D4s, D810,

For info, I am Autistic, Aspergers, ADHD, therefore if I come over as a little "short" on occasions it is not intended, thank you


Top
 Profile Send private message  
 
PostPosted: Fri Jan 25, 2019 7:25 pm 
Offline

Joined: Fri Dec 03, 2004 9:58 pm
Posts: 3547
Location: Wellingborough
I can only guess that the filter is there to protect the diagonal from the full heat energy of the Sun's light? I see it is described as an "energy-rejection filter" in your diagram,

regards,

_________________
Brian
52.3N 0.6W
Wellingborough UK.

254mm LX90 on Superwedge, WO ZS66SD, Helios 102mm f5 on EQ1, Hunter 11x80, Pentax 10x50
ASI120MC Toucam Pros 740k/840k/900nc mono, Pentax K110D
Ro-Ro roof shed


Top
 Profile Send private message  
 
PostPosted: Wed Oct 09, 2019 2:52 pm 
Offline

Joined: Sun Oct 25, 2009 3:56 pm
Posts: 1255
Location: Caithness
Yes, it's to filter out the heat energy.

_________________
BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/


Top
 Profile Send private message  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group