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Forum: Pentax K-70 08-23-2017, 04:34 PM  
Interval shooting oddity?
Posted By ranmar850
Replies: 14
Views: 1,643
I found the answer to my main question in the camera menu in Interval Shooting Options. Default is 1-Interval , where the exposure begins at set intervals the other option is 2-Standby Interval, where the interval selected begins after the finish of the previous exposure. This is very relevant where longer exposures on timelapses are close to the interval you desire.
Forum: Pentax K-70 07-31-2017, 02:06 AM  
Interval shooting oddity?
Posted By ranmar850
Replies: 14
Views: 1,643
Ah, pity. But I may invest in one anyway, when I have the spare cash.
Forum: Pentax K-70 06-21-2017, 04:19 AM  
Interval shooting oddity?
Posted By ranmar850
Replies: 14
Views: 1,643
Just a hypothetical about the OGPS-1. If it is shifting pixels to compensate for star movement, would the satellite track still be rendered the same as if tracking was not used? or would the curve of the track shown be greater ?
Forum: Pentax K-70 05-31-2017, 07:25 PM  
Interval shooting oddity?
Posted By ranmar850
Replies: 14
Views: 1,643
Thanks for that. I had read some reviews on the OGPS-1 and most of those issues had been raised, but not the one about the different focal lengths and recommended exposure times being halved. Although one reviewer did note that he couldn't get his stars really sharp, and put it down to, perhaps, calibration. The focal length thing is only photographic common sense, really.
Forum: Pentax K-70 05-31-2017, 03:32 PM  
Interval shooting oddity?
Posted By ranmar850
Replies: 14
Views: 1,643
Thank you for all that, it clears matters up. I have another thread on this in Photo Critique. Layering of ISS pass - PentaxForums.com The interval thing bought me undone there. I was sure I was shooting the sequence in this thread with the interval set much less than the exposure time, but Subsequent attempts have seen me unable to replicate that. i can look at the originals and see exposure time, but the interval I was using is harder to pin down. Exposure time was 25 seconds, and i was getting 2 exposures per minute, according to the file info. I was perhaps using a 30 sec interval.
I knew I would get gaps, and the layering was going to give me stuttering stars, but I viewed it as a technical, learning exercise as much as anything. I tried a single exposure yesterday morning here ISS pass in Western Australia - PentaxForums.com with less than optimal results. I am now thinking I should invest in the accessory GPS unit so I can utilise the Star Tracking on the K-70--this should give me steady stars and a satellite trail, at least up to the max of 5 minutes it is meant to work to, which certainly will cover any ISS passes.

For prediction, I am using an excellent app on my Android phone, ISS Detector , which also gives me Iridium flash timing. All information is there, including a visual Radar screen which works off your internal phone compass, and also an actual elevation dot which you match against the predicted track. I'll try some captures of that.
Again, thanks for your help.
Forum: Pentax K-70 05-12-2017, 06:14 PM  
Interval shooting oddity?
Posted By ranmar850
Replies: 14
Views: 1,643
After some experimentation, it is obvious that the Interval starts as the shutter closes after the previous shot, and is independant of the actual exposure time. So I can use a 2 sec interval on a 25 sec exposure. I intend to try interval shooting the ISS on a very good pass next Saturday at home, and stack the resulting images. It will be one hour after sunset, and cloud permitting, could be a good blue hour shot. Fingers crossed for weather.
Forum: Pentax K-70 05-08-2017, 04:56 AM  
Interval shooting oddity?
Posted By ranmar850
Replies: 14
Views: 1,643
Ah, now there's a thought! I was actually starting to notice some pretty good satellite flashes after that, as they caught the distant rising sun, forgot about that as I was processing. I was lying on the tray of my ute ( truck :-) ), rugged up, up a bush track away from the small coastal town I live in, very good for lack of light pollution. I had actually given up on the meteor shower by the time I started noticing them, and had an interval shoot going for the sunrise. But yes, that could be it.
Forum: Pentax K-70 05-08-2017, 03:36 AM  
Interval shooting oddity?
Posted By ranmar850
Replies: 14
Views: 1,643
I am happy with my K-70, doing some good stuff and expanding my photographic horizons. I have been using Interval for Time lapse shots, and editing in LRTimelapse. Intervals are usually 5 or 10 seconds. some results below.
Nameless Valley Sunset 4K on Vimeo

Mt Nameless sunset in 4K on Vimeo

happy with these and quite a few more. But the other night I decided to try to capture some of the Eta Aquarids meteor shower. Interval shooting would seem to be the way to go, so, not having really done star shots before, I did 5 minutes of research , a couple of trial shots and settled on 25s @F3.8, ISO 800., focal length. I left the Interval setting on 5 secs, as it seemed to be working. As it turned out, ISO 800 was too low, end of the sequence was at ISO 1600--better, but still underex.
But my question is this--if I am shooting at , say 25 sec exposure, and the shutter seems to be open for 25 secs ( by ear) , how did I get the below picture? This is a layering of three consecutive shots in PS ( my first ever), showing the one tail, of, apparently, the one meteor. Is the camera internally recording the five second interval within the 25 sec exposure? Should I be setting the interval to something longer than the exposure time? Logic would say so?

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