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08-03-2010, 12:20 AM   #1
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can the k-x do a 4 minute exposure?

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is it possible?

08-03-2010, 12:24 AM   #2
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It can do as long as the battery holds out when in bulb mode

to do something like that you'd probably need a darkening filter or two in front of the lens to severely limited the amount of light coming in. If you try even a 30 second exposure in daylight without some darkening filters you'd just end up with a white picture
08-03-2010, 12:29 AM   #3
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QuoteOriginally posted by future_retro Quote
It can do as long as the battery holds out when in bulb mode

to do something like that you'd probably need a darkening filter or two in front of the lens to severely limited the amount of light coming in. If you try even a 30 second exposure in daylight without some darkening filters you'd just end up with a white picture
if i put it in bulb mode how is the exposure? does it depends on what i want? how will i stop it?
08-03-2010, 12:32 AM   #4
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Use a remote trigger (sold separately) to tell the camera when to open the shutter, then again when to shut the shutter. You have to time the exposure yourself and set the aperture and ISO.

Long exposures are fun and take some experience to get right.
It all depends on the amount of ambient light in the scene.
Also consider using the viewfinder cap to avoid light leakage.

08-03-2010, 12:33 AM   #5
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go to M mode, push the shutter speed past 30 seconds, it will go to B. metering will go away and you'll have to do it by trial and error or google to see if there's a way to better judge exposure. Grab a stopwatch and buy a wireless remote off of ebay (I got one for 3 bucks). You press the shutter once to start the exposure and then press it again when you want to stop. The remote is important so you don't shake the camera anytime during the exposure which could potentially ruin the whole shot in some cases

You control exposure just like you would regularly except you wont have a meter to help you

I'd advice you to read the manual if you haven't already. It might answer a lot of question you have if haven't already read it cover to cover
08-03-2010, 12:40 AM   #6
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ok! thank you very much!
08-03-2010, 12:44 AM   #7
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I have had exposures up to 40 minutes with my K-x now (and longer would be possible). To do this, though, I had to use the Lithium AAs because the longest I could get with any of my NiMH batteries (good quality / low leakage) was about 10 minutes (camera locked up after this).

One of the problems with long exposures (> 30s) is that you have to wait for the same period again after the exposure (dark image subtraction - to reduce image noise).

Its also possible to take extremely long exposure by doing a continuous series of 30s exposures and combining with suitable software. This approach can lead to an image with much lower noise and eliminates dark subtraction time. Have not tried it yet myself.
08-03-2010, 06:08 PM   #8
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yep with good batteries
lithiums to be specific

for Ni-Mh batteries never tried it out yet

08-05-2010, 09:52 AM   #9
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QuoteOriginally posted by redeleon Quote
yep with good batteries
lithiums to be specific

for Ni-Mh batteries never tried it out yet
A nice feature of my Samsung Digimax V3 3.2MP P&S is its support for an AC adapter, which I have used a time or two. Too bad the K-x doesn't. Could come in handy.
08-05-2010, 12:22 PM   #10
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The kx supports an ac adapter.

Here's one: http://www.bhphotovideo.com/c/product/637558-REG/Pentax_39762_K_AC84_AC_Adapter_Kit.html

Last edited by Hemi345; 08-05-2010 at 12:30 PM. Reason: add link
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