[APML] direct comparison of hypered vs unhypered LE400 (was Unhypered Print Film)

["Bobby Middleton" <bobm@koyote.com>]

Here's the difference between unhypered LE400 and hypered LE400 (aka PJ400)
Look at Jon Kolb's shot here with unhypered LE400:
http://home.datawest.net/jkolb/m42_region.htm

Now look at my hypered LE400 shot here:
http://www.koyote.com/users/bobm/sword.htm

We are comparing color here not resolution. Jon's using a scope less than
half my apreture so he's doing pretty well resolution-wise. But note the
darker blue of Jon's NGC 1977; and the lighter blue plus more of the fainter
parts of the blue in my shot. This I believe is because of better OIII
(green) response with the hypered LE400. I can point out several more
examples if anyone wants; just e-mail me.
Unhypered LE400 has a purple or dark magenta cast to it because of the lower
OIII response. I saw this all the way back to the Kodak PJM-2 film which is
the very same emulsion as present-day LE400.
Bobby Middleton


----- Original Message -----
From: steve banbury <banburys@sonic.net>

> True, that was asserted--and PJ400 hypered or unhypered was considered
> pretty good--see for example Jon Kolb's
> site: http://home.datawest.net/jkolb/m42_region.htm.
> Referencing the archives, Jon didn't seem to think it absolutely needed
> hypering.
>
> I inferred you were hoping someone actually had some sample images using
> LE400 so you could confirm the assertion and be reassured that
> using LE400 was still considered a good idea by the list.
>
> SteveB
>
> At 03:19 PM 10/1/01 -0700, you wrote:
> >
> >I think the list had decided the 2 films are the same under different
> >label.
> >
> >Steve
> >
> >>--- Original Message ---
> >
> >>Ummm--if the subject was the quality of LE400, why is the M31
> >example you
> >>cite labelled  "Film: Kodak PJ400"?
> >>
> >>SteveB
> >
> >
> >
> >
> >
> >--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
> >             Unsubscribe at <majordomo@seds.org>
> >
>
>
> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>              Unsubscribe at <majordomo@seds.org>


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>