Re: [APML] 120 format 'Centuria Super 400'... (fwd)

[Jason Ware <jtw@galaxyphoto.com>]

Great letter!

Geoff Powers wrote:
> 
>  Hey List...
> 
>      Having entertained the idea of entering the medium format realm, but being dissuaded by a lack of decent films for astro work, I wrote a letter to Konica film support... based on response and info here from Jason's recent post.
> 
>      Below is a forwarded copy, and if and when I hear back, all forward their response.
> 
>  Best...   :o)
> 
> --
>  Geoff
> 
> http://home.att.net/~astropix/
> 
> ----------------------  Forwarded Message:  ---------------------
> From:    astropix@att.net (Geoff Powers)
> To:      film@ph.konicaminolta.us
> Subject: 120 format 'Centuria Super 400'...
> Date:    Thu, 27 May 2004 17:55:37 +0000
> 
>  Hello...
> 
>      Myself, and several others whom belong to the International discussion
> group APML (Astro-Photography Mailing List), have an interest in the Konica
> 'Centuria Super 400' films, in both 35mm and 120 formats.
> 
>      We wish to use this film for long exposure astronomical imagery.
> Preliminary results look promising, but thus far only one group member has used
> the film with success, and he used it under rather ideal conditions.
> 
>      Specifically, we are interested in the emulsion with the spectral
> sensitivity curves shown on the Konica US Web site, here:
> 
>       http://konicaminolta.com/products/consumer/photo/pdfe/pdf/csuper400.pdf
> 
>      Also, Konica's Australian Web site lists availability of this film in 120
> format, and shows 12, 24 and 36 exposure rolls to be available for 35mm. 120
> format is not listed as available on the US Web site. The AU page may be viewed
> here:
> 
>       http://www.konicaminolta.com.au/product_detail.aspx?p=37&id=5&sid=5&cid=-1
> 
>      With the above in mind, I have three questions:
>  1) Is the emulsion detailed in the .pdf file still available, with the same
> characteristic curves shown in this data sheet?
> 
>  2) If so, is there a US dealer who has, or can get, this film in both 35mm and
> 120 format rolls?
> 
>  3) If the film still specs out as shown on the data sheet, are there any
> current plans to change it's sensitivity?
> 
>      With most film manufacturers seeking esthetic 'flesh tones', print films
> with full spectral response in the visible wavelengths are all but gone. Much of
> interstellar space is rich in glowing, ionized hydrogen gas, which is primarily
> around the 656nm line. The 'Centuria Super 400' is among the last possibilities.
> 
>      There are a couple of slide films which work well for astro, but with the
> inherent dynamic range limits and halation properties of slide films, a usable
> print film is sorely desired. Thanks for your consideration, and I anxiously
> await your reply.
> 
>  Sincerely,
> 
> --
>  Geoff Powers
> 
> http://home.att.net/~astropix/
> 
> _______________________________________________
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> http://seds.org/mailman/listinfo/astro-photo

-- 
 -Jason Ware 

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