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Post by Deleted on Jan 9, 2015 23:05:06 GMT
The app I've been using does have a bulb mode. The app is called Nightcap pro. That said, if one is buying a phone for this use it might be a good idea to investigate Android phones since they do not have the 1/3-1 second limit on exposures. www.nightcapcamera.com/nightcap-pro/
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Post by Deleted on Jan 16, 2015 9:05:40 GMT
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Post by Dragon Man on Jan 16, 2015 9:12:48 GMT
Woo-Hooo Curtis! I was asked to show the Comet in my broadcast last night but it was too late by then. I had totally forgotten it was up there and had all night to see it, but when I was asked to show it, it was down behind my shed Good to see that you captured it. M42 shows up good too. Well done
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Post by Deleted on Jan 16, 2015 17:41:07 GMT
I feel I should try out an imaging run next chance I get. From what you see here, do you think the shots with the 2" eyepiece and secondary shadow are better?
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Post by Rick in NWArk on Jan 16, 2015 20:01:06 GMT
Very nice, Curtis!! An impressive amount of detail!
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Post by Deleted on Jan 17, 2015 3:50:57 GMT
I figured out that I should be locking focus at infinity, also, the secondary shadow is there because I need to use an eyepiece closer to the aperture of the phone camera, and make sure it's getting fully illuminated.
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Post by Deleted on Jan 17, 2015 22:07:30 GMT
From further research on a-focal astronomy, I learned that the ideal eyepiece focal length to use is one that has an exit pupil equivalent to the cameras aperture, where the exit pupil is the eyepiece focal length divided by the telescopes focal ratio. In the case of the f/4 scopes (AT8IN & AT12IN) I use, and the iPhone aperture of 4mm then a 16mm focal length eyepiece should be used. Luckily 16mm falls right right in the middle of the range of my 8-24mm zoom eyepiece, which is probably why it's working so well with it. In addition, I will need to pay attention to the eye relief to make sure my distance is at a good place.
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