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Equipment Discussions >> Video and Electronically Assisted Astronomy

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Devon
member


Reged: 03/06/10

Loc: OK
Photographic filter comparisons...???
      #5951765 - 07/02/13 05:15 PM

Hi, all...

Does anyone know where I could find some photographic comparisons of various filters (UHC, O-III, NarrowBand, ect.) I.E., Pictures of the same object without filters, then with filters? I've seen Jim Thomson's EXCELLENT analysis, but am looking for something more 'visual' and 'graspable' for some students.

This is for video camera use and outreach.

Thanks!

Devon


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ccs_hello
Postmaster
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Reged: 07/03/04

Re: Photographic filter comparisons...??? new [Re: Devon]
      #5952688 - 07/03/13 08:32 AM

Devon,

Not the answer you are looking for...

Astro targets have various emission (or absorption) spectrum. Various filters exist to adapt for different needs. Different people will have different viewing conditions as well.
Your original request is too broad a topic.

(This is like comparing a gasoline sedan with brand X oil filter with a diesel train engine equipped with brand Y filter...)

Most of the filter reviews I have seen have been:
comparing a specific type (e.g., O III filters from various makers) onto few astro targets.

Knowing your own specific need (e.g., combat severe light pollution for most astro objects, need to see horsehead, ...) to narrow down the search perimeter would be a good start.

Clear Skies!

ccs_hello


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mclewis1
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Reged: 02/25/06

Loc: New Brunswick, Canada
Re: Photographic filter comparisons...??? new [Re: ccs_hello]
      #5952851 - 07/03/13 10:34 AM

Devon,

Over the years I've seen a few comparisons done and results posted on personal websites. If you poke around using a search tool (searching on the name of a particular filter) you should find a few of them. In my experience it's rare to find good comprehensive comparisons. Most folks don't spend too much time with comparable filters, they tend to pick one that works better for them and sell the others.


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Devon
member


Reged: 03/06/10

Loc: OK
Re: Photographic filter comparisons...??? new [Re: ccs_hello]
      #5952879 - 07/03/13 10:50 AM


I know, and I agree. What I'm looking for are some general pictures, showing something like "this is M42 without any filters, and this is what it might look like with an OIII or a Astronomik UHC, or a typical LPR filter, given normal light polution".

Also looking for examples of general filters used on emission and reflection nebulae, as well as the effects on globulars and galaxies.

I have found a few pictures, but was hoping to find more and better examples. As I said, these are for giving students a general idea of how filters work (when they ask).

I am working on some comparitive shots myself, but I've had so few clear nights, it makes it hard.

Plus, my 'cloud filter' isn't working for *BLEEP*....!

Have a great one!

Devon


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mega256
scholastic sledgehammer
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Reged: 05/10/07

Loc: N of Tampa
Re: Photographic filter comparisons...??? new [Re: Devon]
      #5953195 - 07/03/13 02:04 PM

Jim Thomson's web site has the most comparisons that
I have ever seen....some of his early stuff shows a lot
of what you want..

http://karmalimbo.com/aro/

example

http://karmalimbo.com/aro/reports/Test%20Report%20-%20LP%20Filters%20Under%20...

Edited by mega256 (07/03/13 02:10 PM)


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Devon
member


Reged: 03/06/10

Loc: OK
Re: Photographic filter comparisons...??? new [Re: mega256]
      #5953294 - 07/03/13 02:50 PM

Hi, Bob...

That is exactly what I was looking for.

I've gone through Most of Jim's articles, but I must have missed this one.

Thanks, and have a great day!

Devon


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