I have the ASI 178MM (for Solar)

For those interested in imaging and image processing with DSLR, CCD, webcam or film.

Moderators: joe, Brian, Guy Fennimore

Post Reply
Posts: 559
Joined: Tue Dec 05, 2017 11:53 am

I have the ASI 178MM (for Solar)

Post by skyhawk »

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

dq.jpg (125.73 KiB) Viewed 4096 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
Posts: 3691
Joined: Fri Dec 03, 2004 9:58 pm
Location: Wellingborough

Re: I have the ASI 178MM (for Solar)

Post by Brian »

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,

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
Posts: 1357
Joined: Sun Oct 25, 2009 3:56 pm
Location: Caithness

Re: I have the ASI 178MM (for Solar)

Post by smerral »

Yes, it's to filter out the heat energy.
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/
Post Reply