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

[astropix@att.net (Geoff Powers)]

 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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