Re: [APML]FIlm Test - Ilford SFX200

[Brian larmay <power_windows4789@yahoo.com>]

Hi Bill..

Im surprised the H-a filter allowed stars at all!
Nice results with the H-a and tp though under mag 3.0
skies.... I didnt think it was possible to capture
that much nebula under such conditions.

Out of curiosity concerning the SFX and for any other
film that falls in the category of bad reciprocity
failure, what causes reciprocity fialure? 
It seems from one film to the next, its a hit and
miss.

Thanks for taking the time,
Brian




> Gentlemen,
> 
> There was some discussion regarding the suitability
> of Ilford SFX200 for
> Astro-Photography. I just happened to have a roll of
> SFX200 so while
> imaging last night I slapped the roll in and exposed
> a shot just to see.
> The results of this test can be viewed at:
> 
> http://www.celestial-images.com/film-test.html
> 
> This test compares Hypered Tech Pan,thats all I had
> handy, with
> unhypered SFX200. Same subject, OTA, Exposure etc
> etc.
> 
> Rosette Nebula in Monoceros
> 253mm f/4 Newtonian. Lumicon Coma Corrrector and Ha
> Filter
> Guided Off-Axis with the ubiqitious ST-4
> 
> Exposure times are 45 minutes each. (Lumicon Ha
> filter in place)
>  
> Development: Tech Pan - 6 min D-19
> Development: Ilford - 6 min Tmax (their
> recomendation)
> 
> Both negatives scanned @ 4000 dpi, 16 bits
> greyscale. Imported into
> Photoshop. These are full size scans. No scropping,
> no levels, no curves
> .... no hits no runs, and no errors :^) What you see
> here is what you
> get.
> 
> Regards
> 
> Bill
> 
> -- 
> William R. Mattil	|                              
> wrmattil@ix.netcom.com	| http://celestial-images.com
>      
> (972) 399-4106		|
> _______________________________________________
> Astro-Photo mailing list
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> http://seds.org/mailman/listinfo/astro-photo


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