Coronado PST - ITF filter protection?

Use this section to discuss "standard" Baader/Coronado/ Lunt SolarView/ Daystar, etc… filters, cameras and scopes. No mods, just questions/ answers and reviews.
Post Reply
User avatar
Greg77
The Sun?
The Sun?
Posts: 9
Joined: Fri Jan 01, 2016 12:59 pm
Location: Slovenia/EU

Coronado PST - ITF filter protection?

Post by Greg77 » Sat Jan 09, 2016 4:24 pm

Hello!

My PST is currently on service by Bresser. Original ITF is "rusty" abd needs to be replacet with Beloptik ITF.

In the future....is it wort protecting replaced ITF filter with something like Hoya or Marumi 52mm UV/IR Cut filter placed in front of the PST objective?

What's the reason of the failing ITF filter...overheating...."too much" UV and IR light passing through sistem?

Clear Skies!

Greg
Attachments
q2ecgnyv.jpg
Meade 5000 series 127mm/f7.5 APO + Vixen GP2 mount
Coronado PST DS 0.5A + SW AZ3 mount

User avatar
Merlin66
Librarian
Librarian
Posts: 3113
Joined: Tue Dec 13, 2011 1:23 pm
Location: St Leonards, Australia
Contact:

Re: Coronado PST - ITF filter protection?

Post by Merlin66 » Sat Jan 09, 2016 8:35 pm

Gregg,
The ITF fails due to a breakdown of the edge seal (probably caused by heat load or some other condition), this then allows the ingress of moisture which causes the failure.
ITF filters can last from months to years.
Adding a UV-IR to the objective would help but it needs to be a quality optical filter - most of the photographic filters we've seen are not good enough.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest