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Photodana · 10-21-2021, 04:03 AM

A Friend of mine wants to know which model his Pentax Spotmeter is. It uses a 9V mecury battery and looks like the image attatched.

Attached Images

steephill · 10-21-2021, 04:42 AM

Might be a Spotmeter III with an added Zone System graphic on the control dial. Spotmeter | My Pentax

**gofour3** · 10-21-2021, 05:23 AM

Or the even older Spotmeter 1/21.

Phil.

Wheatfield · 10-21-2021, 09:01 AM

Originally posted by Photodana

A Friend of mine wants to know which model his Pentax Spotmeter is. It uses a 9V mecury battery and looks like the image attatched.

As steephill mentioned, it's a Spotmeter III. It's probably useless at this point as getting a battery of the correct fit and voltage will be impossible. The old meters didn't have voltage regulators, so the battery has to be the one the meter was designed to use.

**Derek** · 10-21-2021, 06:20 PM

What can be seen of it from this angle is identical to my 1/21. However, the 1/21 manual makes no mention of a 9v mercury cell; only a 9v regular cell and a 1.3v mercury. I've been getting occasional use of this meter by substituting an A640 (LR52) for the mercury cell.
This brings up a question that I sometimes wonder about. The Spotmatics came out in the heyday of mercury cell use, but can function well with alkalines due to the presence of "bridge circuitry". Is it possible that the Pentax spotmeters of that era share the same circuitry?

10-21-2021, 04:03 AM	#1
Photodana Senior Member Join Date: Feb 2008 Location: Greater Copenhagen Photos: Gallery \| Albums Posts: 161	Pentax Spotmeter A Friend of mine wants to know which model his Pentax Spotmeter is. It uses a 9V mecury battery and looks like the image attatched. Attached Images

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10-21-2021, 04:42 AM	#2
steephill Pentaxian Join Date: Nov 2018 Photos: Albums Posts: 590	Might be a Spotmeter III with an added Zone System graphic on the control dial. Spotmeter \| My Pentax

10-21-2021, 05:23 AM	#3
gofour3 Site Supporter Join Date: Oct 2008 Location: Vancouver, Canada Posts: 8,092	Or the even older Spotmeter 1/21. Phil.

10-21-2021, 09:01 AM	#4
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,987	Originally posted by Photodana A Friend of mine wants to know which model his Pentax Spotmeter is. It uses a 9V mecury battery and looks like the image attatched. As steephill mentioned, it's a Spotmeter III. It's probably useless at this point as getting a battery of the correct fit and voltage will be impossible. The old meters didn't have voltage regulators, so the battery has to be the one the meter was designed to use.

10-21-2021, 06:20 PM	#5
Derek Site Supporter Join Date: Jun 2008 Location: Terrace, BC, Canada Photos: Albums Posts: 122	What can be seen of it from this angle is identical to my 1/21. However, the 1/21 manual makes no mention of a 9v mercury cell; only a 9v regular cell and a 1.3v mercury. I've been getting occasional use of this meter by substituting an A640 (LR52) for the mercury cell. This brings up a question that I sometimes wonder about. The Spotmatics came out in the heyday of mercury cell use, but can function well with alkalines due to the presence of "bridge circuitry". Is it possible that the Pentax spotmeters of that era share the same circuitry?