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Forum: Pentax SLR Lens Discussion
09-09-2018, 04:25 PM
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Yes that sounds right, thanks. Should have thought of that!
---------- Post added 09-09-18 at 04:43 PM ----------
Thanks Kevin, some great advice! I watched the video and downloaded Sequator, looking forward to giving it a whirl!
---------- Post added 09-09-18 at 04:45 PM ----------
Thanks MaineNative! Do you still see the trails even with 80-90 second exposures?
---------- Post added 09-09-18 at 04:46 PM ----------
Thanks very much, photoptimist! It all makes very good sense.
---------- Post added 09-09-18 at 04:47 PM ----------
Thanks Steve, others agree with you. Not sure why I chose 4 mins, really kind of arbitrary!
---------- Post added 09-09-18 at 04:48 PM ----------
Great, thanks DeadJohn! I've seen pictures before like the one you attached but hadn't given them much thought (except maybe that it was some kind of PP trick)!
---------- Post added 09-09-18 at 04:49 PM ----------
Thanks! Not sure I understood... will stacking remove that UWA trailing effect? Or are you stacking using longer lenses?
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Forum: Pentax SLR Lens Discussion
09-08-2018, 11:00 PM
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I tried using the astrotracer on my K-1 recently for the first time and got an unexpected result. In the first picture, the foreground is of course blurred in this 4 minute astrotracer exposure, but the stars in the center look pretty good. But on the edge of the picture, at upper left, you can clearly see well developed star trails. They're also present at upper right but the stars up there are too dim to see well. In the second picture, taken 10 minutes later, I used a 30 sec exposure. The star trails aren't really evident. The lens I'm using in both cases is the Samyang 14 mm prime.
So it appears that the astrotracer will distort star trails on the fringes of the field of view using wide angle lenses. Has anyone else seen this? At what focal length does the problem start to diminish? Or is 4 seconds just too long? Looks like it wasn't designed for this type of use.
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