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operating temperature range m7


kb7001

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Guest AgXlove

I would expect the temperature operating range of the M7 to be similar to that of the MP, one example of which just returned from an extended sojourn in the arctic.

 

If you will be using the M7 for an extended time in temperatures below 10'F/-12'C, it should be "winterized" with the proper cold weather lubricant by Leica or a Leica authorized service center. The normal temperature range lubricant will coagulate and clump up in very cold temps, leaving the mechanical workings subject to wear.

 

If you will be using your camera for short times in cold temps, your main concern is internal condensation in both camera body and lenses. When I photograph in the cold, I return my cameras and lenses to the camera bag and zip it up. If the bag has been open and out in the cold, it will be cold soaked like your camera and lenses.

 

I then leave the bag closed up overnight so it and the contents can gradually return to room temperature before opening it. I have never had a problem with internal condensation when using this gradual warm-up method.

 

You could probably open your cold camera bag after 4 hours indoors and not have condensation issues. Unzip the bag after 4 hours and prop the zipper open; let it sit for another hour so that warm air infiltrates and slowly warms the contents. I haven't tried this method yet, but I'd expect that condensation wouldn't be an issue.

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Another issue to beware of in low temperatures is static discharge; this can happen when the moisture content in the air is extremely low. Rapid winding of the film can lead to fogging as a result.

 

Some years ago I used a Nikon F90x in the Arctic Circle, with an external battery pack to keep it fed. I had no problem with operation per se but did have a couple of shots ruined as above.

 

Regards,

 

Bill

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Another issue to beware of in low temperatures is static discharge; this can happen when the moisture content in the air is extremely low. Rapid winding of the film can lead to fogging as a result.

 

Some years ago I used a Nikon F90x in the Arctic Circle, with an external battery pack to keep it fed. I had no problem with operation per se but did have a couple of shots ruined as above.

 

Regards,

 

Bill

 

Wow! Just when you think you've taken care of every little contingency, along comes static discharge.

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Hi

 

The M4 to M7 Manuals say the baseplate load diagram is only for cold weather, in warm weather take more film through the tulip... It cold weather the film can shatter coming out of the tulip.

 

I suggested you should read the manual cause you would not have believed me, otherwise

 

Noel

Edited by Xmas
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