Uv/ir cut

Use this section to discuss "standard" Baader/Coronado/ Lunt SolarView/ Daystar, etc… filters, cameras and scopes. No mods, just questions/ answers and reviews.
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alessbonsai
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Uv/ir cut

Post by alessbonsai »

in WL with astrosolar, in front of the 540nm filter do I have to use a uv/ir filter? is the Baader filter suitable or do I have to use one in particular


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Re: Uv/ir cut

Post by Dennis »

It might give better results. Baader recommends a uv/ir cut filter for visual use with the 540nm filter and the shown bandpass ranges from 400nm-700nm. So i would try it out and see if a difference is there.


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Re: Uv/ir cut

Post by Montana »

I usually do, the older versions of the Baader Continuum didn't block very far IR so tended to make imaging blurry. If you have one, use it anyway, it won't change anything if you don't need it but will make a huge improvement if you do need it :)

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Re: Uv/ir cut

Post by alessbonsai »

i have the new version of the uv/ircut filter. I can mount the 1.25 filter directly on the nose of the camera … camera-filter540-barlowtv2x-uv/ir-herschel filter…


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Re: Uv/ir cut

Post by marktownley »

I would mount that uv/ir cut much higher up the optical train if you can


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Re: Uv/ir cut

Post by alessbonsai »

I always get confused… at the top you mean near the sensor or the telescope? My doubt is, can a filter immediately after the sensor worsen the performance of the powermate or telecentric in general?


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Re: Uv/ir cut

Post by DavidP »

Generally, when we talk about before or after in an optical train we are referencing the path of light in time. So with a refractor, first is the objective lens, last is the detector.
It seems to be good practice to put the UV/IR filter closer to the refractor objective. The earlier you can reject heat causing energy, the better. This lessons the potential to build up heat in the system. When Mark says higher up, he means earlier in the incoming light path or closer to the refractor objective.


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