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Did Questar ever make photographic solar filters?

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#1 RichA

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Posted 09 November 2013 - 07:59 PM

I tried using an off-axis unit on a Q-7 but the image of the sun was far too bright. It was like the kind of filters Thousand Oaks made for photography. The brightness was uniform so I doubt it was deterioration of any kind, no pinholes.

#2 ColoHank

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Posted 09 November 2013 - 09:00 PM

My Questar off-axis solar filter yields very pleasing orange images. Definitely not too bright.

What shutter speed are you using?

#3 Les

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Posted 10 November 2013 - 10:02 AM

I don't see anything on the Company 7 site for white light work. If you are doing eyepiece photography, maybe adding a polarizing filter or Moon filter will help.

Actually most photographic filters pass more light not less, hence the prohibition against viewing directly through a photographic solar filter.

If you are handy, you might try making your own aperture mask out of Baader Solar film. I have used a Solar film filter for a Televue 85 on my Q50th and find it delivers all the resolution I get from my Questar filter, although the sun's disk appears white instead of yellow. Actually, that is a help for my old eyes as it enhances contrast.

It does seem odd that you can't photograph something that you can comfortably view visually.

#4 nytecam

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Posted 10 November 2013 - 03:21 PM

Don't use Polaroid or acetate (theatre) gells - although in combo they may appear dark to the eye, they TRANSMIT IR/heat virtually unimpeded ! ! :<(

#5 Les

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Posted 10 November 2013 - 05:08 PM

I certainly wasn't suggesting using eyepiece filters WITHOUT a solar objective filter in place. But the mylar solar filters work well and are used by many.

#6 Billydee

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Posted 10 November 2013 - 10:07 PM

RichA,

Questar makes a Variable Polarizer Filter for the Questar 3.5 or for the Questar 7 Axial Port (PN19276). The filter costs $453.00 (2008 price list). This would be the way to go for photo work. You should call Jim R at Questar and find out what the max % of transparency is. I would guess that you could use it in addtion to the OTA solar filter.

They also have a 30% polarizer filter that screws to the bottom of the Brandon EPs or the Camera Coupling Set that is part of the 10 piece filter set (PN19235)(set price was $276 in 2008).

Bill

#7 RichA

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Posted 22 November 2013 - 12:47 AM

Actually, I'm not trying to do photography. I've seen an off-axis Q7 filter that yielded images FAR too bright to be used visually, so it reminded me of photographic solar filters from other manufacturers. I wanted to know if it was made purposely this way since it didn't appear faded or damaged in any way.


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