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01-10-2013, 01:11 PM   #1
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K-5iis long exposures

Guys just wondering what would be the longest long exposure you've done with successful results with the K-5 or its variants ??

Coming from the K-7 I'm a little unsure I would get successful results.

01-10-2013, 01:31 PM   #2
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I've done up to 30 seconds but I recently got a remote so I should be able to go longer now.

here's a successful 20 s exposure


Model: PENTAX K-5
ISO: 80
Exposure: 20.0 sec
Aperture: 13.0
Focal Length: 15mm
Flash Used: No
01-10-2013, 01:50 PM   #3
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Thanks but I'm I was able to get the exposure close to what I wanted at ISO 6400 with 2 minute exposure which means to take that same exposure at say ISO 80 is like an hour exposure .. not even close to being with it with the K-7 so I'm just wondering if it was worth the effort with the K-5iis
01-10-2013, 01:53 PM   #4
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That's some seriously dark conditions.

The k-5IIs (and even the k-5) has much much much better high ISO than your k-7. Where you wouldn't go past ISO 1600 on your k-7, k-5 users have no issues going to 6400. Whether that holds true at long exposure, however, I can't answer.

01-10-2013, 01:58 PM   #5
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Going beyond 30 seconds with digital, in general, can create "hot" pixels. Usually people mix multiple photos taken at 30 seconds to get longer exposures.
01-10-2013, 02:09 PM   #6
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But does stacking at 30 seconds increase exposure levels
01-10-2013, 02:38 PM   #7
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I've taken several 4 minutes exposures with the original K5 and there is no problem at all, and I've seen an 86minutes exposure that was perfect. It's a great long exposure camera.
01-10-2013, 03:02 PM   #8
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I have done a 45 min star trails.

01-10-2013, 03:12 PM   #9
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QuoteOriginally posted by milesy Quote
But does stacking at 30 seconds increase exposure levels

Sent from my HTC Legend using Tapatalk 2
Check this tread:

https://www.pentaxforums.com/forums/pentax-dslr-discussion/210829-first-astro...ml#post2229292

He shot the cosmos with 77 equivalent min exposure with 4 x 480 sec exposures plus 9 x 300 sec exposures.
01-10-2013, 03:29 PM   #10
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QuoteOriginally posted by dtmateojr Quote
I have done a 45 min star trails.
Thanks guys ... do you have the 45 min exposure posted somewhere ?
01-10-2013, 04:39 PM   #11
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QuoteOriginally posted by tuco Quote
Going beyond 30 seconds with digital, in general, can create "hot" pixels. Usually people mix multiple photos taken at 30 seconds to get longer exposures.
I've done exposures with various Pentax models of just less than one hour. How many images exactly??

Using three current Pentax digital cameras - over 1k in exposures. I've never run into the hot pixel issue with any Pentax camera.

For some unknown reason though the issue does appear more frequently in Canon cameras - especially the full frame ones, but only normally in very long exposures also far exceeding iso 800. Most will also eventually disappear.
01-10-2013, 04:45 PM   #12
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QuoteOriginally posted by Medium FormatPro Quote
I've done exposures with various Pentax models of just less than one hour. How many images exactly??
I don't do very many long exposures on digital. So I can't say. It is camera dependent. Not long ago a guy on the medium format thread was doing long exposures with his 645D and complaining about "hot" pixels. They were much longer than 30 seconds though.
01-10-2013, 05:55 PM   #13
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I guess I was more concerned with noise rather ygM single hit.pixels which cab be cloned out
01-10-2013, 06:58 PM   #14
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QuoteOriginally posted by tuco Quote
Check this tread:

https://www.pentaxforums.com/forums/pentax-dslr-discussion/210829-first-astro...ml#post2229292

He shot the cosmos with 77 equivalent min exposure with 4 x 480 sec exposures plus 9 x 300 sec exposures.
tuco - Hey thanks for sharing Glad you liked the thread. I'm hoping to go out again this weekend weather permitting and give the K5IIs another go with long exposures.

milesy - I uploaded a large original size image from the K5IIs non stacked. One 8 minute exposure so you can have a look at it here. It's a good example of why to stack multiple images for astro images at least, as there's always some sort of junk streaking across the sky lol. http://stevenkovickart.com/astro/horsehead_1stack.jpg
01-10-2013, 07:08 PM   #15
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No issues with noise myself with the K-5 classic and 5-20min exposures at ISO 100-200.
Nice results with minimal noise reduction required from the converted RAW image, e.g.:

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