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MR-44 adapter, for my Konica Auto S3 - problems
Old 11-04-2019   #1
Cortexturizer
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Question MR-44 adapter, for my Konica Auto S3 - problems

So I bit the bullet and bought the MR-44 adapter from smallbatterycompany out of UK, first thought it wasn't working but then verified it does deliver 1.35v under load.

But... it makes ZERO difference in any of my 3 cameras: Auto S3, Hi-Matic 7S II and Olympus 35 RD. The meters read absolutely the same as with the LR44 which is your usual suspect small 1.5 alcaline.

I get absolutely the same readings.

Maddening stuff. Especially considering the price of the adapter.

Why do you guys think this is the case?

Also, I have actually discovered that my S3 (very recent acquisition) underexposes by 2 stops anyway, regardless if it's light meter is fed with 1.5 or 1.35v.

Also - it seems that EVERY Auto S3 already has the diode installed in it's battery compartment from the factory - http://wkoopmans.ca/notebook/wp-cont...aS3repair2.jpg

Mine does too, is it possible that Konica made them like this? I mean, if this is as such what would be my solution here - to install another diode in series?! OR just some other diode with higher voltage drop?

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Old 11-04-2019   #2
shawn
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If you are comfortable pulling the top off you can recalibrate the meter on the Auto S3. There is a fixed resistor near the meter that you can swap out to adjust the reading. It has been a few years but I think I reduced the resistance to increase the exposure.

The other option is to just set your film speed two stops lower.

Shawn
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Old 11-04-2019   #3
Cortexturizer
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Quote:
Originally Posted by shawn View Post
If you are comfortable pulling the top off you can recalibrate the meter on the Auto S3. There is a fixed resistor near the meter that you can swap out to adjust the reading. It has been a few years but I think I reduced the resistance to increase the exposure.

The other option is to just set your film speed two stops lower.

Shawn
Thanks Shawn!

I am comfortable with it I just am unable to find a spanner wrench that'll have the lower span limit of less than 10mm!!! Because I believe I need something like 8mm to be able to open the rewind top part thingy
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Old 11-04-2019   #4
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I think I used a pair of pointed tip tweezers for mine.

Shawn
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Old 11-05-2019   #5
Phil_F_NM
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My first small spanner was fashioned out of a cheap pair of kids scissors with the ends ground flat to blades.
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Old 11-05-2019   #6
maigo
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Using side cutters, trim a paper clip into a U shape. Makes a narrow wrench for retaining caps and such.


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Old 11-05-2019   #7
Cortexturizer
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Great ideas for a DIY spanner wrench guys, much appreciated!
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