Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
09-29-2019, 02:21 PM   #1
New Member

Join Date: Sep 2019
Posts: 1
Reversed Light Meter?

Hello! I am new to film, although I am not new to photography. I just purchased a Pentax Asahi Spotmatic F and it is lovely. The only thing I am a little confused about it the light meter. When I push the switch up, the light meter does not respond to any adjustments made to shutter, aperture, etc. When the switch is down, however, it responds. Is this correct or do I just have a wonky reversed light meter switch? In which case, do I keep it in the up position while not using it to help my battery last longer? Thanks!

09-29-2019, 02:38 PM   #2
Site Supporter
Site Supporter
johnha's Avatar

Join Date: Apr 2012
Location: Lancashire, UK
Photos: Albums
Posts: 1,083
Welcome to the forum. The Spotmatic F will open aperture meter with a Super-Multi-Coated or SMC Takumar lenses. Moving the meter switch up is not required, and may not be desirable. With earlier Super Takumar lenses you would need to use the meter switch. Keeping the lens cap on will minimise battery drain.
09-29-2019, 03:34 PM   #3
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 38,816
Welcome to the Pentax Forums!

QuoteOriginally posted by aphill33 Quote
In which case, do I keep it in the up position while not using it to help my battery last longer?
Do you have a copy of the user manual? You can download free from the Pentax Manuals Web site...
Pentax Manuals | M42 Manuals (Password for PDF is "Pentax")
With S-M-C and SMC Takumar lenses:
  • Slider on the lens stays in the "Auto" position
  • Meter is ON except when the lens is capped. Be sure to put the cap back on when the camera is not in use.
  • DOF preview is done using the up-down switch on the side of the lens mount area. Do not meter exposure when this switch is in the UP position.

With other than S-M-C or SMC Takumar lenses:
  • Slider on the lens may be used in both "Auto" and "Manual" positions
  • To meter, use up-down switch on the side of the lens mount to both stop the lens down and turn on the meter
  • DOF preview may be done using either the meter switch or the lens slider switch
I hope this helps.


Last edited by stevebrot; 09-29-2019 at 03:43 PM.
10-03-2019, 11:14 AM   #4
noblepa's Avatar

Join Date: Sep 2007
Location: Bay Village, Ohio USA
Posts: 1,118

A word of caution about the Spotmatic F. The lightmeter is always on, unlike the earlier Spotmatics. There is no on/off switch for the meter.

This means that a lens cap or body cap is essential. Otherwise, the meter will constantly draw current from the battery, exhausting it very quickly.

As others have already pointed out, the slider on the lens mount merely stops the lens down for depth-of-field preview.


  • 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!
asahi, camera, light, light meter, meter, pentax help, photography, reverse, reverse light meter, spotmatic, switch, troubleshooting
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
ADVISORY: Pentax 6x7, 67 METER COUPLING CHAIN AND TTL METER PRISM Silent Street Troubleshooting and Beginner Help 8 11-22-2020 06:20 PM
K1000 Light Meter Calibration - Aperture has no effect on light meter? appalachian1 Pentax Film SLR Discussion 5 03-14-2017 07:08 PM
Light Meter Resurrection - Quality Light Metric Eyewanders Pentax Film SLR Discussion 6 06-23-2016 01:13 PM
How to meter if you don't have a light meter? LFLee Pentax Medium Format 25 02-09-2012 11:45 AM

All times are GMT -7. The time now is 10:00 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]