Re: [APML] H-Alpha Filter - which brand to buy?

["John Lanoue" <johnlanoue@hotmail.com>]

Hi Stuart,

I tried the kenko r64 filter for Ha photography... want a 58mm filter for 
free?  I wasn't happy with the results at all.  I also own an 82mm lumicon 
Ha filter and every step ring imagineable, the difference between the two, 
IMHO, is night and day.  Two weeks back I shot NGC7K with my lumicon filter 
under heavy moonlight and while the photo was not a keeper (due to some 
field rotation creeping in), the density on the tech pan was sweet, much 
more depth and contrast than I would have expected due to all the moonlight. 
  I've shot with the R64 filter under moonless skies and not gotten anywhere 
near as good results.

Just my $0.02...

john



John Lanoue
Principal Software Engineer
Bedford, NH
http://www.geocities.com/johnlanoue/


>From: Stuart Heggie <stuart.j.heggie@sympatico.ca>
>Reply-To: Discussion of Film Astrophotography <astro-photo@seds.org>
>To: Discussion of Film Astrophotography <astro-photo@seds.org>
>Subject: [APML] H-Alpha Filter - which brand to buy?
>Date: Sat, 18 Oct 2003 18:19:05 -0400
>
>Hi all - if I want to buy an H-Alpha filter for my Nikkors and I want the 
>max flexibility, I think I will want a 72mm front filter for my 180mm ED 
>lens and a step ring to bring it down to the 52mm of my 105, 50 and 24mm 
>lenses. Hoping the tech pan team knows the answer.
>
>Kenko R64 comes in 52mm and 72mm for $26.95 and $53.95 USD respectively. I 
>am suspicious that they are not true H-Alpha filters but rather plain red 
>filters that they advertise as being "h-alpha-like". These are the only 
>H-Alpha filters on the Hutech site that I can find.
>
>Lumicon makes theirs in the weirdest sizes meaning I'd need two step rings 
>- their 77mm filter is $89.95 USD - I could buy both Kenko filters for less 
>and skip the step rings entirely.But! maybe these are "real" h-alpha 
>filters not just red filters?
>
>Right now I'm using a dark red filter I have from my B&W daytime film days 
>(wanna be artiste you know). Maybe I've got what I need already? Mind, it 
>is a 49mm for my Minolta camera so I had to step it up to 52mm.
>
>Help?
>Stuart
>
>
>
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