ok, I finally got some results....
The camera definitely takes a while to complete the process, after the button is pressed the 2nd time to stop the exposure. After standing there and watching the little circular orange light blink for 2 to 3 minutes, I decided to walk upstairs and wait and come back later. When I came back, the light had stopped blinking. In the image, there is definitely light pollution coming off of lights on the back of the house. So I can see why people like to do this in the forest where there is absolute darkness. It's a Ultra 100 MB/s SD XC I card.
Image 1: Final result after about a 15 minute exposure. ISO 400 at F4. This is the only image I was shooting for. Not optimal, as in the future I want a lot of black in the image.
Image 2: Short exposure at ISO 1600 F4 - practice image take before image 1
Image 3: Short exposure at ISO 100 F4 - practice image taken before Image 1
Question: How long of an exposure can I take using this method?
---------- Post added 10-02-21 at 09:53 PM ----------
Originally posted by interested_observer Disable all of the additional image processing items. They are probably delaying the saving of the image. Image save should be pretty immediate and fast.
I added a couple of thoughts to the initial post. Don't be afraid to up the ISO to start to get something. If you are using one shutter push to open and then a subsequent second shutter release to close, put a hat over the lens to block the light just before the second push. Also use a 2 second delay.
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I would start with 5 minutes - you will get star trails but not really long ones. This would be a good test period rather than waiting 20, 30 40 or an hour. Get everything working and then go for a 20 minute duration.
Thanks for the tips. As you can see from my post, I was able to get some result. I think ISO 100 would be appropriate considering the light pollution coming off the back of my house and other houses in the area...
I am using the IR remote to start the exposure (it waits 3 seconds after button is pressed to begin) and then use the remote to stop the exposure.
---------- Post added 10-02-21 at 09:56 PM ----------
Originally posted by seventhdr Plus remember that for a 45 minute exposure your camera needs to do another 45 minute exposure with the shutter closed to create a dark noise exposure to subtract from the first exposure to remove noise due to the heat generated by the sensor while the shutter was open for the first 45 minute exposure.
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This may explain why in your second trial there was no resulting image as you had not allowed the camera to do the second exposure to then subtract the noise.
Regards
Chris
I wasn't aware that heat was generated by the sensor. With my method, just one push of remote to start then one push of the button to stop, isn't there just 1 exposure?
Regardless, does heat become an issue on the camera?