what causes this?


Link Posted 07/08/2016 - 22:16
i was experimenting with some long exposures using an nd3.0 filter, and every image has this light steak on the bottom third of the image. Only the long exposures, between 15 and 30 seconds, have this, all normal exposure images are fine. Ive never really tried this before, am i doing doing something wrong? i have attached an image, straight out of camera.


Link Posted 07/08/2016 - 22:35
Are you covering the viewfinder when doing these ? If not you risk light entering.



Link Posted 07/08/2016 - 22:38
I agree with George - for long exposures with a ND filter, you will need to cover the viewfinder. When I did this without covering the viewfinder, I didn't get the streak effect - but got the washed out look across the frame


Link Posted 07/08/2016 - 22:40
Thanks George, I didnt....is that what it is?


Link Posted 07/08/2016 - 23:16
scarr1 wrote:
Thanks George, I didnt....is that what it is?

Most likely yes. Try with the viewfinder cover that comes with the camera (did with k5 and above)




Link Posted 07/08/2016 - 23:56
scarr1 wrote:
Thanks George, I didnt....is that what it is?

Definitely, you need to cover the viewfinder on long exposures in daylight.
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Link Posted 08/08/2016 - 07:15
Yep, when doing long exposures during the day, you have to cover the viewfinder, otherwise you get light leaks that look like this.

vic cross

Link Posted 08/08/2016 - 07:28
If you don't have the correct cover then just place a piece of black cloth over the back of the camera. It's easier and less fiddley.
Born again biker with lots of Pentax bits. Every day I wake up is a good day. I'm so old I don't even buy green bananas.


Link Posted 08/08/2016 - 12:07
thanks for all the replies.....very helpful.
my camera (k3) did come with a viewfinder cover, but i thought it was just to protect it!!
looking at it, it looks like i would have to remove the viewfinder eyepiece rubber to use it, which seems a bit of a clart on. Bit of black cloth (thanks Vic) sounds like a good idea....or may try a bit blu tac.
i will try again next time im up the caravan....


Link Posted 08/08/2016 - 13:48
It's the bit of plastic the rubber is attached to that slides up and off. Don't try pulling the rubber or you may tear it. Comes off quite easily , get my thumb nail under it (just above lcd) and pull upwards. The cover then just slides on.



Link Posted 09/08/2016 - 00:08
The eyecup is a stiff article to remove. I always carry a push-on lens cap that hangs quite happily over the viewfinder and does the job a treat
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