PX625 and PX675 (in a Konica TC)

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JGOB

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Feb 12, 2016
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Hey,

I have a couple of film camera's and a X100T which I use to check if the lightmeters on my film camera's are still working.

My X100T gives the same reading as my Konica T3N (I tested at ISO1600 and a shutter speed of 1/250 with gave me f5.6 in both cases. I had the Konica T3N converted to use normal batteries (i.e 1,55V silver oxide batteries) but it used to run on PX675. Before the conversion I used 1.4V zinc-air hearing aid batteries (which are luckily also labeled 675) to replace the PX675. And they worked fine.

Now I recently acquired a Konica TC. I wasn't actually going for the TC but for the three Hexanon lenses that came with it. So I thought the TC would make a nice birthday present for my 10 year old niece who told me she wants to be a photographer when she grows up (yay!).

Been testing the light meter but at ISO1600 and 1/250 the meter reads f2.8. Two stops off. I tested it with film, I compensated for the two stops and the film turned out fine but of course this makes it a lousy present.

I tested the TC with two 675 zinc-air batteries. The TC actually uses two PX625 batteries (or two 625 zinc-air hearing aid batteries) but I have none. I have a lot of 675's because I still use them in my Konica Auto S3 rangefinder. They have the same voltage, they're just smaller, so it didn't seem like a big problem. But because of the wrong reading on the lightmeter I am doubting this. Is it possible that they would give a different reading? Or is the lightmeter busted? Well not busted, faulty :smile:
 

Xmas

Member
Joined
Sep 4, 2006
Messages
6,398
Location
UK
Format
35mm RF
Hey,

I have a couple of film camera's and a X100T which I use to check if the lightmeters on my film camera's are still working.

My X100T gives the same reading as my Konica T3N (I tested at ISO1600 and a shutter speed of 1/250 with gave me f5.6 in both cases. I had the Konica T3N converted to use normal batteries (i.e 1,55V silver oxide batteries) but it used to run on PX675. Before the conversion I used 1.4V zinc-air hearing aid batteries (which are luckily also labeled 675) to replace the PX675. And they worked fine.

Now I recently acquired a Konica TC. I wasn't actually going for the TC but for the three Hexanon lenses that came with it. So I thought the TC would make a nice birthday present for my 10 year old niece who told me she wants to be a photographer when she grows up (yay!).

Been testing the light meter but at ISO1600 and 1/250 the meter reads f2.8. Two stops off. I tested it with film, I compensated for the two stops and the film turned out fine but of course this makes it a lousy present.

I tested the TC with two 675 zinc-air batteries. The TC actually uses two PX625 batteries (or two 625 zinc-air hearing aid batteries) but I have none. I have a lot of 675's because I still use them in my Konica Auto S3 rangefinder. They have the same voltage, they're just smaller, so it didn't seem like a big problem. But because of the wrong reading on the lightmeter I am doubting this. Is it possible that they would give a different reading? Or is the lightmeter busted? Well not busted, faulty :smile:
The camera should work with two zinc air batteries the largest hearing aid cells each with a plumbers o ring to centre, or similar plastic part.
If not it should still work in manual.
Teach the girl mono and sunny side /16.
 
OP
OP
JGOB

JGOB

Member
Joined
Feb 12, 2016
Messages
24
Location
Brussels
Format
35mm RF
Hey,

I tested the TC with two 675 zinc-air batteries. The TC actually uses two PX625 batteries (or two 625 zinc-air hearing aid batteries) but I have none. I have a lot of 675's because I still use them in my Konica Auto S3 rangefinder. They have the same voltage, they're just smaller, so it didn't seem like a big problem. But because of the wrong reading on the lightmeter I am doubting this. Is it possible that they would give a different reading? Or is the lightmeter busted? Well not busted, faulty :smile:

I was wrong here. PX625 size hearing aid batteries don't exist. You just use the 675 zinc-air batteries and put them in an adapter. So the voltage is correct and I guess the lightmeter is faulty. If anyone knows what could be the cause of this, feel free to share. Thanks!
 
OP
OP
JGOB

JGOB

Member
Joined
Feb 12, 2016
Messages
24
Location
Brussels
Format
35mm RF
If I would put a couple of 1.55V batteries in, would it (partially) compensate or would it make it worse?
 
OP
OP
JGOB

JGOB

Member
Joined
Feb 12, 2016
Messages
24
Location
Brussels
Format
35mm RF
The 1.55V batteries did the trick. It is (almost) spot on with my digital light meter.
 
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