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Lorne Spry
Tinkerer
Username: Thol
Post Number: 1
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, August 16, 2006 - 03:18 am: | 
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This is a question about the bridged meter circuit in a Praktica LTL3. And I am ASSUMING from what I have read that it indeed does have an bridged circuit.
SOLUTION AS ADOPTED
A local dealer sold me a non-electronic adapter to physically contain a Toshiba silver oxide 1.55 Volt battery. I have seen a graph that shows the discharge voltage to be very nearly the same as the banned mercury types such as the 625's. So one problem is taken care of. BUT, do I still need to worry about metering in strong light ? Do I need to set the ASA setting by +1 to +2 f stops? |
Stephen Brian
Tinkerer
Username: York_praktica_fan
Post Number: 1
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, August 16, 2006 - 06:59 am: |
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Lorne
I've been using the MTL3 for years, I have read that it is bridge circuit.
I have sucessfully used the alkaline PX625 cells in the camera |
Lorne Spry
Tinkerer
Username: Thol
Post Number: 2
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, August 16, 2006 - 11:39 am: |
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Thanks Stephen. My research tells me that the alkaline version increased from the mercury version's 1.35 Volts to 1.5 Volts. When you say 'successfuly', am I right in assuming that you were not making exposure compensations of some kind? If so, I am very reassured.
The silver oxdide SR-43 I am using is .05 Volt greater than the alkaline PX625, which should be negligable IMO. I have read that the bridged circuit in the LTL is not fussy about Voltage, but I really want some confirmation for two reasons. Firstly, I was getting some suprising readings today in bright light Ñ but then it has been a long time since I have used an internal lightmeter. (I am used to using old Zeiss Ikons and the f16 rule). Secondly, I want to travel with this camera next week, and I have not much time for testing.
BTW: Years ago I had a Praktica (LLC?) with the electrically coupled lens and the full open aperture metering system. It was brilliant, and the light metering was the best of ANY camera I have ever used. I abandoned the model after I had two shutter overhauls in very short order. I kept the Meyer Gorlitz lenses (50 & 100mm) and they are now belong to the stop-down type LTL3 I found in a used camera shop recently. I am SO happy to have found a very clean unit!
Cheers and thanks for the first reply to my first ever thread on this forum. Ñ Lorne |
Roy Randall
Tinkerer
Username: Roy
Post Number: 2
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, August 16, 2006 - 12:23 pm: |
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In electronics a 'Bridge' circuit is a balanced circuit that should handle slightly over or under voltages with accuracy. Who says modern is best? |
Ernestojl
Tinkerer
Username: Ernestojl
Post Number: 2
Registered: 09-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 15, 2006 - 06:19 am: |
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The bridge type exposure meters would only suffer from some slightly increased sensitivity, but will bring accurate exposure readings.
Depending on the type of markings in the VF, the Over/ under exposure markings are usually placed 1/2 stop or less over and under the right value. Raising the battery voltage will reduce the a/m gap. In fact nothing the be worried about.
Cheers. Ernesto |
