My longest exposures so far with either original 645 or Nii has been around 15 minutes. On several occasions in temperatures well below zero celsius; when alkaline batteries perform poorly. No problems at all.

If you notice any problems, there is an external battery pack accessory for the 645 cameras; with a generous length of cable to keep the batteries inside your clothing or in another warm place. I do hate the thought of being nailed to one spot for 6 hours, though...:-)

Cheers,
Jostein


----- Original Message ----- From: "Gasha" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, January 31, 2006 1:56 PM
Subject: Re: P645 and loooong exposures



Manual says, that fresh set of 6 AA batteries (good alkaline batteries) can take 250 rolls of film.
So, i have good Duracell alkalines installed.

I think, that i can get more than one 6 hour exposure from fresh batteries.

Whatever, the original question was how to keep fresh batteries, and take long exposure :)

OK, i still have unfinished roll of film in 645. I'll post results tomorrow.

Gatis

William Robb wrote:

----- Original Message ----- From: "Mishka"
Subject: Re: P645 and loooong exposures


are you kidding? run out of AA batteries by just keeping the shutter open?
how long is going to be the exposure - months?


I don't know about the 645, but Pentax indicates in the 6x7 manual that a fresh battery will give about 6 hours of shutter open time. The 6x7 runs on a single PX28 (6 volt) battery, which is essentially 4 S76 batteries in a stack,

William Robb



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