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[Chicago Astronomer - Astro Joe]

Violet/Purple Lumicon 2" Filter

A purple/violet filter is not usually part of the normal assortment of eyepiece filters. I came across this on an Ebay sale and made a low-ball offer...and accepted!

For less than the listed price I get a Lumicon Purple/Violet filter delivered.

For refractors, this filter would help the chromatic aberration that is often a common artifact around objects in the eyepiece. But, I'm looking for it to sharpen things up a bit and increase contrast - bringing out details.

Let's see how it performs...

[scottmason]

Looking forward to see what this filter does.
Joe, perhaps you can help me out. I contacted Baader about this, but who knows how long it will take for them to get back to me.
I recently bought a Baader 2" UV/IR cut filter online. Although the rest of my optics are all 2" and fit into each other perfectly well, this filter does not screw into my focal reducer or my visual back. Are there special adapters or threaders for certain 2" filters? It seems the filter is about .25" smaller than my 2" pieces.

[Chicago Astronomer - Astro Joe]

Scott...

Does the filter screw into the eyepieces?

All 2" filters are, (or should be), 48mm. There should not be any need for an adapter, which would vignette the FOV.

What are you screwing onto your visual back now?

On my old visual back on the C11, the threads on the rear cell side were slightly off, causing the motorized focuser to "slip" off occasionally. When I got the Crayford-style dual speed focuser, the included visual back threaded onto the rear cell solidly.

[mojocvh]

Joe, was it a Celesteron visual back?



Andy.

[Chicago Astronomer - Astro Joe]

Mo...

Dunno, but I assume it was.

It was a JMI motorized focuser collar that barely bit into the visual back. The new VB
worked great.

[Chicago Astronomer - Astro Joe]

My filter came in....

In pristine condition, it arrived quick...

But...it's a lot darker than I anticipated it would be. A Number 47 Purple, it's very deep...

...as demonstrated by Shirley Hemphill and Esther Rolle.

I think it will be good for solar contrast with the while light filter and perhaps with the full Moon...but I dunno about planetary.

[scottmason]

Jan 22, 2013 21:26:15 GMT -6 Chicago Astronomer - Astro Joe said:

Scott...

Does the filter screw into the eyepieces?

All 2" filters are, (or should be), 48mm. There should not be any need for an adapter, which would vignette the FOV.

What are you screwing onto your visual back now?

On my old visual back on the C11, the threads on the rear cell side were slightly off, causing the motorized focuser to "slip" off occasionally. When I got the Crayford-style dual speed focuser, the included visual back threaded onto the rear cell solidly.

Unfortunately I can't use my diagonal+eyepiece threader for because it creates too much distance for focus. I have a visual back that's just a 2" ring that connects to my t-ring which is short enough to focus with. It's hard to describe..