Joseph McAllister prattled about focusing screens:
Here's another source for LX screen info:
http://www.euronet.nl/~pimr/lxfsmain.html
--
Shel Belinkoff
mailto:[EMAIL PROTECTED]
> I'm sorta jumping in on the middle of this discussion of using "PZ"
> series screens in the venerable LX. And I have no problem with it! Do it
> myself. Wish they all fit in all and would not affect metering, but
> that's not gonna happen.
>
> The Pentax screens are coded by series, using the suffix. The prefix is a
> description of the design.
>
> The originals were for factory or authorized shop replacement, and had
> none of these numbers or letters, only a Pentax part number.
>
> The next series were defined by what was to become the prefix, sometimes
> followed by a number if there were several variations of the same design.
> In most publications, it looks like some numbers were skipped. I
> attribute this to "special order" or "Special use" screens that were in
> scientific and industrial versions of the catalog. These were known as
> the "M" series screens, for the MX and any other -M camera that had
> interchageable screens.
>
> SA-1
> SA-3
> SB-1
> SC-1 (Standard)
> SD-1
> SE
> SG
> SI
>
> The next series was made for the LX. They tended to be a bit brighter
> than the "M" series, and were siad to not be usable in MXs. Of course,
> they can, but the metering system has to be adjusted to make up the
> difference in brightnes. The MX measures it's light off the screens. The
> LX does not, making the MX screens perfectly compatable with the LX.
> Beattie Intensascreens were made for this camera as well. The screen code
> was left the same for identical designs, and 20 was added to the suffix,
> ie: SA-1 became SA-21. A new screen was a clear screen with crosshairs
> for astrophotagraphy, the SD-11 for the LX. Being a clear screen, MX
> metering would not work with that screen. My guess to that logic was that
> adding 10 to the suffix meant it was the first of it's kind, and worked
> with the MX and the LX..
>
> SA-21 (normal lenses)
> SA-23 (fast lenses (f:2.8~f:1.2)
> SA-26 (for Tele lenses - 300mm or longer)
> SA-32 (
> SA-37 (special ALL microprism screen for Macro and older "dim" tele)
> SB-21 (matte with split image only)
> SC-21 (Standard - matte with microprism collar and split image center)
> SC-26 (for Tele lenses - 300mm or longer)
> SD-21 (Matte w/ crosshairs in a clear central spot)
> SD-11 (clear w/ central crosshairs)
> SE-20 (All matte w/ finer matte center circle)
> SE-25 (for Tele lenses - 300mm or longer)
> SG-20 (etched grid)
> SI-20 (Image magnification scales)
>
> The SF- series of cameras used the -40 series numbers, but only had two
> screens besides the standard. These were the SG-40 and the SI-40, with
> Grid and Image scales respectively.
>
> The PZ-1 manual only mentions on the specification page that the
> viewfinder screens are interchangable. Nothing else. But they in fact had
> a complete series available. The -50 series.
>
> The PZ-1p manual describes and shows drawing of the basic seven screens,
> omitting some older designs, and adding some new.
>
> FF-60 (matte with AF frame)
> FG-60 (matte with grid and AF area)
> FI-60 (matte with scales for magnification and AF area)
> FK-60 (matte with "golden section" lines, milimeter markings, and AF
> area)
> FM-60 (Standard - Matte w/ panorama frame, spot metering circle and AF
> area definition)
> FP-60 (matte with panorama frame and AF area)
> FS-60 (matte with spot metering circle and AF area)
>
> And I'm sure there are many more if Pentax was queried about just what
> was available "in toto." Pentax and other manufacturers don't want to
> confuse the common man with all that is really available, in screens or
> special accessories.
>
> I will assume that the MZ-S will have a new series.
>
> I imagine they would be the -80 series.
>
> The older series should work with this MZ-S as it is said to have
> standard off the screen metering and the PR says the screens would be
> brighter still. So like with all the other models, these can be used, as
> long as the ev corrections are made as appropriate.
>
> All this data and more (pictures) can be found on Boz's site, at
>
> <http://www.phred.org/pentax/k/focusing/index.html>
>
> Some info will disagree. I used the respective manuals, brochures and
> Shipman's. Boz just collects info from everywhere about everything
> K-Mount!
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