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Message |
    
Chris
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 02, 2005 - 10:12 pm: | 
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I have a Praktica BMS (not sure if you'd call it a classice yet?) It all works as it should but last weekend we were trying to do a 15 minuite exposure of star trails and the shutter wouldn't close when the shutter button was released.When the battery was dislodged the mirror dropped & the shutter closed as it should have done when releasing the button.
The camera works fine on all the other shutter speeds including 4 seconds and the battery is the correct Duracell and has been in for just 2 weeks.
Can anyone tell me what this is likely to be or give me some pointers to look for?
Many thanks
Chris |
Stuart Willis
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 02, 2005 - 10:58 pm: |
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When you dislodged the battery you broke the circuit and removed the current from the shutter solenoid which then reversed its position and allowed the mechanical completion of the cycle.
Best guess is that the micro-switch shutter release is a bit sticky. Given the camera is AOK in all other respects including the 4 second exposure - you might not find it worthwhile to remove the top-plate and investigate unless you are regularly into those long time-exposures.
Best
Stuart Willis |
charlie
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, May 03, 2005 - 08:34 am: |
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To avoid any motion blurring while you try to close the shutter you can hold a black card in front of the lens long enough to slip a lens cap on and then deal with the battery/sticky shutter. You can also use the card in the middle of the exposure to blank out passing airplanes, UFO's, etc. |
Chris
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, May 03, 2005 - 04:31 pm: |
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Thanks Stuart. The camera will be used quite a lot for Astrophotography so it may be worth having a look.
Thanks Charlie too! I use the black card method but was just holding it on the lens whilst I sorted out the battery. Never thought about putting the cap back on! |
