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

[Stuart Heggie <stuart.j.heggie@sympatico.ca>]

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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