Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-27-2022, 06:12 PM - 1 Like   #1
New Member




Join Date: Nov 2022
Posts: 3
Half-frame Pentax Spotmatic SP1000, any info on these cameras?

Hi all,

I bought an as-is Spotmatic SP1000 and I was pleasantly surprised to find out that it's a half-frame version.

I have no idea if this is a factory or aftermarket modification (tho it does have a 1979 factory service sticker). If it were a camera repair person who modified this camera, it's a pretty elaborate job: the modified viewfinder mask is very clean and gearing modification to get it to advance the correct amount feels very smooth (and I've confirmed it's accurate).

If anyone has any information on this camera, I'd love to hear it. I won't be able to shoot a roll until I service it (capping at speeds > 1/250) but I'm eager to see the results.

Excuse the lousy the phone photos:

Attached Images
View Picture EXIF
SM-G973W  Photo 
View Picture EXIF
SM-G973W  Photo 
View Picture EXIF
SM-G973W  Photo 
View Picture EXIF
SM-G973W  Photo 
View Picture EXIF
SM-G973W  Photo 
11-27-2022, 07:15 PM - 1 Like   #2
Moderator
Site Supporter
Loyal Site Supporter
MarkJerling's Avatar

Join Date: May 2012
Location: Wairarapa, New Zealand
Photos: Gallery | Albums
Posts: 19,357
Welcome to the forum.
You may wish to check this thread and see if anyone there can offer any advice: The HALF-FRAME-35mm Club - PentaxForums.com
11-27-2022, 09:40 PM   #3
Site Supporter
Site Supporter




Join Date: May 2016
Photos: Albums
Posts: 1,762
Do the viewfinder, focus, and mentoring seem to work normally, or maybe they are modified?
11-28-2022, 01:34 AM - 1 Like   #4
Moderator
Loyal Site Supporter
Loyal Site Supporter
pschlute's Avatar

Join Date: Mar 2007
Location: Surrey, UK
Photos: Gallery
Posts: 6,328
Wow, I never even new this was a thing.

11-28-2022, 08:12 AM   #5
Site Supporter
Site Supporter




Join Date: Jun 2008
Location: Idaho
Photos: Gallery
Posts: 1,949
Reminds me of something from way back that only does portrait format ................. my cell phone. Really neat modification to the camera and a film saver too boot. Did it come with a 25mm lens?
11-28-2022, 10:11 AM - 1 Like   #6
Pentaxian




Join Date: Jan 2018
Location: Jersey C.I.
Posts: 2,552
I remember doing something similar to an old Zeiss Netter 12-on-120 when I was at college, converted it to 16-on so's I could get more exposures on a roll of film
11-28-2022, 12:22 PM   #7
New Member




Join Date: Nov 2022
Posts: 3
Original Poster
QuoteOriginally posted by leekil Quote
Do the viewfinder, focus, and mentoring seem to work normally, or maybe they are modified?
The focus works as normal, the half-frame focal plane mask is at the same height as the normal rails. The viewfinder mask was modified to show the half frame. I'm not sure if there were any changes to the metering.

To the best of my knowledge, this camera came stock with centre-weighted metering so I reckon, left alone, it would be a sort of quasi-average metering that de-emphasizes the top and bottom of the frame.

11-28-2022, 12:25 PM   #8
New Member




Join Date: Nov 2022
Posts: 3
Original Poster
QuoteOriginally posted by Bob 256 Quote
Reminds me of something from way back that only does portrait format ................. my cell phone. Really neat modification to the camera and a film saver too boot. Did it come with a 25mm lens?
It certainly feels weird to hold it sideways for landscape. It came with a standard SMC Takumar 55mm f1.8.

---------- Post added 11-28-22 at 12:26 PM ----------

QuoteOriginally posted by kypfer Quote
I remember doing something similar to an old Zeiss Netter 12-on-120 when I was at college, converted it to 16-on so's I could get more exposures on a roll of film
That's a great idea. How did you figure out how far to advance?
11-28-2022, 12:50 PM   #9
Pentaxian




Join Date: Sep 2020
Posts: 407
QuoteOriginally posted by bottlegardener Quote


That's a great idea. How did you figure out how far to advance?
It's much easier with film advance knobs, as opposed to levers which also serve to cock the shutter.
11-28-2022, 03:42 PM   #10
Pentaxian




Join Date: Jan 2018
Location: Jersey C.I.
Posts: 2,552
QuoteOriginally posted by bottlegardener Quote
That's a great idea. How did you figure out how far to advance?
Just make an extra hole in the rear cover, covered with a piece of red filter, to line up with the numbers on the paper backing.
There's three rows of numbers on the paper backing, one each for 8-on, 12-on and 16-on align your new hole with the 16-on numbers and away you go
FWIW, it's the same row of numbers that are used if you cut a roll of 120 down for use in an 828 camera bin there, dun that as well see kodak classics - mischa koning
11-28-2022, 05:53 PM   #11
Pentaxian
titrisol's Avatar

Join Date: Dec 2007
Location: In the most populated state... state of denial
Photos: Gallery | Albums
Posts: 1,576
Seems like an aftermarket modification, and yes is possible
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, factory, film, half-frame, modification, pentax spotmatic, portrait format, service, slr, sp1000, spotmatic
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Landscape A half full, or half empty moon... SointulArt Post Your Photos! 6 10-14-2021 04:13 PM
Nature Half & Half eaglem Post Your Photos! 6 01-04-2021 12:40 AM
Full frame vs half frame Paul Charlier Pentax K-1 & K-1 II 13 06-28-2019 04:12 AM



All times are GMT -7. The time now is 05:59 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top