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

[Vicent Peris <vicentperis@ya.com>]

Hi Stuart and John,

I've tried the Kenko R64 filter with E200 and I'm very pleased with the 
results! I mag 6.5 skies you can shoot one hour at f/2.8
and the sky is very dark. The fact is that E200 makes a great job with 
H-alpha filters because the film itself acts as a second filter,
as the residual blue and green pollution light that the Kenko don't blocks 
are not in the same film's layer that the red light
from the nebulae. I love E200 for h-alpha pics, I will not have the same 
resolution as TP, but I'm learning that a really dark
background in the film makes the nebulas' gradients VERY much softer!

That's all,
regards,
Vicent.




At 22:30 18/10/2003 -0400, you wrote:
>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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