Maier ITF - first failure?!

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Merlin66
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Maier ITF - first failure?!

Post by Merlin66 » Tue Apr 03, 2018 5:12 am

I, like many others, have replace failed Coronado ITF filters with the Maier ITF.
Over the years I've been very happy and impressed by the Maier performance.
Well, this morning I was presented with my first Maier failure......
The central 40% is "burnt out" - not easily visible from the bright front surface but very noticeable when inspecting the rear of the filter.....

(This is a "H-alpha ITF Blocker -ITF0143# 1")

Has anyone else experienced failure of these ITF???????
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Re: Maier ITF - first failure?!

Post by GUS » Tue Apr 03, 2018 6:35 am

That's interesting Ken, any pictures?

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Re: Maier ITF - first failure?!

Post by Merlin66 » Tue Apr 03, 2018 6:45 am

A couple of quick images.
First the rear surface against a bright background.....
Maier_failure1.JPG
Rear surface
Maier_failure1.JPG (241.96 KiB) Viewed 838 times
The front surface....difficult to see the failure.
Maier_failure2.JPG
Front surface
Maier_failure2.JPG (234.48 KiB) Viewed 838 times
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Re: Maier ITF - first failure?!

Post by GUS » Tue Apr 03, 2018 6:55 am

Looks like the Beloptik might be a better option, hard coatings on KG3 and RG630, cost a bit more, and the whole filter diameter is utilised, you don't need the O ring.

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Re: Maier ITF - first failure?!

Post by Merlin66 » Tue Apr 03, 2018 10:24 am

My money would be on a Baader 35nm Ha CCD filter at the front of the blocking filter diagonal.

(No O ring was used in this fitment.....)
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Re: Maier ITF - first failure?!

Post by GUS » Tue Apr 03, 2018 10:59 am

I tried the Maier originally, but replaced it with the Beloptik ITF for one BF and a Baader 35nm plus a Beloptik KG3 with IR/UV cut for the other.

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Re: Maier ITF - first failure?!

Post by Merlin66 » Tue Apr 03, 2018 11:05 am

You don't need any secondary filters with the Baader.....it gives good cut-off as is.
(I've used the UV/IR KG3 filter on it's own as an ITF......OK but I prefer the Baader solution.)

Just interested... why did you replace the Maier ITF??
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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"Astronomical Spectroscopy for Amateurs" and
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Re: Maier ITF - first failure?!

Post by GUS » Tue Apr 03, 2018 11:32 am

I use my Coronado BF's with my Lunt scopes. The Maier filter had too much background glow, plus the O ring wouldn't fit which left an exposed bit of filter around the circumfrence. In comparison, the Beloptik filter image looked a lot cleaner without too much glow. Interesting about the Baader, I remember seeing a thread on here regarding the Baader not being sufficient as a stand alone ITF for visual. I know with the Lunt ERF which is RG610 that I can use the KG3 without the Baader.

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Re: Maier ITF - first failure?!

Post by marktownley » Tue Apr 03, 2018 7:57 pm

I guess laminated filters are always going to fail sadly :(
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Re: Maier ITF - first failure?!

Post by Merlin66 » Tue Apr 03, 2018 10:29 pm

Gus,
I don't believe there are any safety issues using the Baader 35nm filter as an ITF.
I use the the "big brother" D-ERF version on my PST Mod.......
"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

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Re: Maier ITF - first failure?!

Post by Valery » Sun Apr 08, 2018 2:36 pm

Merlin66 wrote:
Tue Apr 03, 2018 10:29 pm
Gus,
I don't believe there are any safety issues using the Baader 35nm filter as an ITF.
I use the the "big brother" D-ERF version on my PST Mod.......
According to my experience the KG3 is essential. 35nm Baader alone as an ITF is not enough.
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Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: Maier ITF - first failure?!

Post by Merlin66 » Sun Apr 08, 2018 4:46 pm

Valery,
What exactly have you found that the KG3 gives that the Baader doesn't?
As tested with the spectrograph, there should be no issue.
"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

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Re: Maier ITF - first failure?!

Post by DavidG » Tue Apr 10, 2018 10:01 pm

Both of my Maiers filters are still perfectly clear and my two are the first two he made.

- Dave
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