Which oiii filter?

[Richard Navarrete]

I recently put my 20+ year old Lumicon oiii filter in my scope and noticed some glare in the eyepiece. I was looking at the veil, and it certainly was more visible with the filter, but the glare was weird. I put in Mark W’s Lumicon oiii of similar vintage and better contrast and no glare! I have two questions.

Why do filters go bad?

What brand oiii filters are people using. I’ve heard there has been improvement in filter technology.

Thanks,

Richard

Sent from the all new AOL app for iOS

[Vishal Kasliwal]

I'm very happy with my Tele Vue Bandmate IIs.

--
Observing Sites, Observing Reports, About TAC linked at top of:
https://groups.google.com/forum/#!forum/sf-bay-tac
 
Subscribers post to the mailing list at:
 
sf-ba...@googlegroups.com,
---
You received this message because you are subscribed to the Google Groups "The Astronomy Connection (TAC)" group.
To unsubscribe from this group and stop receiving emails from it, send an email to sf-bay-tac+...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/sf-bay-tac/1295153060.426419.1750440838302%40mail.yahoo.com.

[John Pierce]

On Fri, Jun 20, 2025 at 10:34 AM 'Richard Navarrete' via The Astronomy Connection (TAC) <sf-ba...@googlegroups.com> wrote:

I recently put my 20+ year old Lumicon oiii filter in my scope and noticed some glare in the eyepiece. I was looking at the veil, and it certainly was more visible with the filter, but the glare was weird. I put in Mark W’s Lumicon oiii of similar vintage and better contrast and no glare! I have two questions.

Why do filters go bad?

What brand oiii filters are people using. I’ve heard there has been improvement in filter technology.

I've been using DGM filters, especially their NPB, which is O-III + H-Beta

[Richard Navarrete]

I’ve got an npb. I should compare .

Richard

Sent from the all new AOL app for iOS

--

Observing Sites, Observing Reports, About TAC linked at top of:
https://groups.google.com/forum/#!forum/sf-bay-tac
 
Subscribers post to the mailing list at:
 
sf-ba...@googlegroups.com,
---
You received this message because you are subscribed to the Google Groups "The Astronomy Connection (TAC)" group.
To unsubscribe from this group and stop receiving emails from it, send an email to sf-bay-tac+...@googlegroups.com.
To view this discussion visit

https://groups.google.com/d/msgid/sf-bay-tac/CAJnkzXK6yui5oCZqrq9as2wnJhqmwwhNV47ZpMDNEdukPjpi7A%40mail.gmail.com

.

[John Pierce]

On Fri, Jun 20, 2025 at 11:10 AM 'Richard Navarrete' via The Astronomy Connection (TAC) <sf-ba...@googlegroups.com> wrote:

I’ve got an npb. I should compare .

you will see a LOT more of the Veil with a NPB. If you look at a color photo of the Veil, the 'pink' areas are H-alpha while the green or bluish areas are O-III.    the NPB will show both visually, as where there's Halpha there's also H-beta. 

[Ted Hauter]

Spectrum Thin Films did the Bandmates. The owner is an amazing personality. The lab is amazing. I got to go there every year from 2011 to 2015.

--

Observing Sites, Observing Reports, About TAC linked at top of:
https://groups.google.com/forum/#!forum/sf-bay-tac
 
Subscribers post to the mailing list at:
 
sf-ba...@googlegroups.com,
---
You received this message because you are subscribed to the Google Groups "The Astronomy Connection (TAC)" group.
To unsubscribe from this group and stop receiving emails from it, send an email to sf-bay-tac+...@googlegroups.com.

To view this discussion visit https://groups.google.com/d/msgid/sf-bay-tac/CAJnkzXL1_kFJaSp7f4ph_FACkK56DaeaaeJPqMmur4VTN8Nq%3Dg%40mail.gmail.com.