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Re: [APML] Films responding to Ha, Hb, OIII

Ray, you're too funny!

First off, we're all friends this side of the pond so please no Canadian vs. American stuff.
Second, I see your point on the star trail (pun). Not sure I want to do the experiment but next
time I put a roll of the Chromogenic film in the Nikon F2, I just might!

Stuart "Who's ancestry is Scottish and Irish but is still proud to be a Cannuck" Heggie

----- Original Message -----
From: "Ray Butler" <ray.butler@nuigalway.ie>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Friday, October 15, 2004 1:50 PM
Subject: Re: [APML] Films responding to Ha, Hb, OIII


>
> Stuart Heggie wrote:
>
> > Ray, Canadian slang is consistent with American slang: bust is bad.
>
> Thanks for the explanation! And apologies for committing the ultimate
> faux-pas of mistaking a Canadian for an American. Happens to me too:
> "Hey, you're Irish? Isn't that part of Great Britain?..." To which
> ignorance, I reply: "Yeah, just like Texas is part of Mexico" (;-))
>
>  > So, for star trails it was a very poor performer.
>
> When I think about it, that is not necessarily a bad sign. In a star
> trail, each star spends only a short while on a given part of the film
> emulsion, so it is like a stream of short exposures really. You would
> not necessarily expect a film, whose strength is low reciprocity failure
> over many minutes of sustained exposure on the same point of light, to
> stand out in a star trail. A film with high raw speed but poor
> reciprocity would appear to be more sensitive for that application...I
> think!
>
> Ray "who'd be proud to be a Canadian, too" Butler
>
> > Stuart
>
> --
> Dr. Ray Butler (ray.butler@nuigalway.ie || ray@physics.nuigalway.ie)
> Lecturer, Dept. of Physics || Computational Astrophysics Laboratory
> National University of Ireland, Galway, University Road, Galway, Ireland.
> Tel: +353-91-524411 ext. 3788   FAX: +353-91-525700
>
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