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#31
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Super Moon eclipse
In article , Mayayana
wrote: | What would really be useful is an app to show you what's in front of you by using the camera. Then you wouldn't trip over anything while you look for the moon. such apps exist. |
#32
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Super Moon eclipse
rickman:
I am thinking of taking a trip down south next summer. I want to go far enough south that when I turn 90 degrees to the right I will be headed north. Remember that in the place you're talking about, the first day of spring was last week and summer starts in December. Remember, though, that summer temperatures at the south pole rarely reach 0°C. -- I agree with almost everything that you have said and almost everything that you will say in your entire life. usenet *at* davidillig dawt cawm |
#33
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Super Moon eclipse
RichA:
Don't forget. Exposure times from unclipsed full moon and fully-eclipsed moon can vary from (at ISO 200) f/8 at 1/1000th to as much as 8 minutes(!need driven mounting). You're just as ignorant here as you are in sci.astro.amateur. You can't make an eight-minute exposure of the Moon; no telescope mount is designed to track it precisely for that length of time and manual guiding won't work over that length of time on a non-point source. Furthermore, the moon is very bright when full, fairly bright in full eclipse; I can't imagine any circumstance in which such a long exposure would be required. I typically photograph the Moon with a Questar Duplex https://www.flickr.com/photos/primeval/21181354091, 89mm aperture, FL 1400mm @ Ÿ16. Those who photograph the Moon at high-resolution and long focal lengths (up to 8 meters, in my case) typically use scientific imaging cameras such as those from Point Grey http://www.ptgrey.com/ to shoot video, then they use special software to choose the best frames and align and combine them. Sometimes, though, one can get lucky with a single DSLR exposure. See my 2009 photo at https://www.flickr.com/photos/primeval/21552899880/. Made with an 1100mm Ÿ7.3 astronomical telescope @ ISO 100 and 1/250 sec. -- I agree with almost everything that you have said and almost everything that you will say in your entire life. usenet *at* davidillig dawt cawm |
#34
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Super Moon eclipse
On 09/26/2015 07:46 PM, Davoud wrote:
RichA: Don't forget. Exposure times from unclipsed full moon and fully-eclipsed moon can vary from (at ISO 200) f/8 at 1/1000th to as much as 8 minutes(!need driven mounting). You're just as ignorant here as you are in sci.astro.amateur. You can't make an eight-minute exposure of the Moon; no telescope mount is designed to track it precisely for that length of time and manual guiding won't work over that length of time on a non-point source. Furthermore, the moon is very bright when full, fairly bright in full eclipse; I can't imagine any circumstance in which such a long exposure would be required. I typically photograph the Moon with a Questar Duplex https://www.flickr.com/photos/primeval/21181354091, 89mm aperture, FL 1400mm @ Ÿ16. Those who photograph the Moon at high-resolution and long focal lengths (up to 8 meters, in my case) typically use scientific imaging cameras such as those from Point Grey http://www.ptgrey.com/ to shoot video, then they use special software to choose the best frames and align and combine them. Sometimes, though, one can get lucky with a single DSLR exposure. See my 2009 photo at https://www.flickr.com/photos/primeval/21552899880/. Made with an 1100mm Ÿ7.3 astronomical telescope @ ISO 100 and 1/250 sec. That 8 minute exposure kind of threw me when I first saw it. I have photos of a full moon, that I shoot using the "Sunny-16" rule (shutter speed equals ISO, Full sun= f/16, etc.) at around f/5.6 or f/8. I was guessing that a "blood moon" would be a couple or three stops down from the light of a full moon. I'll be shooting ISO400 ('cuz I've got a pile of that film!), using my 1200mm lenses with Canon FX cameras. Since my 1200mm is f/11, I'll be adjusting the exposure with the shutter speed and shooting wide open. I don't think depth of field will be an issue. I figure shutter speeds from 1/125 to 1/30 should get it. I'll be shooting with two setups side by side, with one setup a stop wider than the other. All this assumes the weather holds, and each forecast is looking better. I figured for metering I'd use a Luna-Pro. That's a joke- lunar eclipse, "Luna"-Pro- get it? -- Ken Hart |
#35
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Super Moon eclipse
Ken Hart wrote:
That 8 minute exposure kind of threw me when I first saw it. I have photos of a full moon, that I shoot using the "Sunny-16" rule (shutter speed equals ISO, Full sun= f/16, etc.) at around f/5.6 or f/8. I was guessing that a "blood moon" would be a couple or three stops down from the light of a full moon. It varies hugely. Helen Hogg, in "The Stars Belong to Everyone" says that there have been at least three cases when the eclipse was dark enough that the moon disappeared entirely. (In two cases this seems to have been connected to volcanic dust in the atmosphere, but in the most recent case on June 10, 1816 that does not appear to have been the explanation. At other times total eclipses of the moon have been particularly bright, for instance in the eclipse of March 19, 1848, the moon was so bright that many persons doubted that the moon was really in eclipse. (see pages 112-113 of The Stars Belong to Everyone). Peter. -- |
#36
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Super Moon eclipse
On 2015-09-26 18:06:29 +0000, Savageduck said:
On 2015-09-26 16:08:41 +0000, Davoud said: Giff: I would like an app which, when I turn around the phone, shows me exactly where to expect the moon to rise, does such an app exist? Already mentioned in this thread: The Photographer's Ephemeris http://photoephemeris.com/ covers sunrise/set and moonrise/set. No need to rotate the phone or iPad. Also available free as a web app for your Mac. If you need the stars and deep-sky as well, try SkySafari Pro. Here you get to wave your phone around. The "Sky Guide" app for $2.99 does a pretty good job for those who want sky mapping along with some basic information for iDevices. In the basic view it shows your horizon with a running time line, and also shows the various bodies below the horizon. https://itunes.apple.com/us/app/sky-guide-view-stars-night/id576588894?mt=8 It does a similar job to "Sky Safari Pro" for those who might not want to spend $40 on the app, and who might not need the more powerful app. https://itunes.apple.com/us/app/skysafari-4-pro-planets-most/id766939977?mt=8 Here is an iPod "Sky Guide" screenshot taken this AM showing the Sun's position. The same can be done for the Moon, satellites, etc. https://db.tt/l5rATlME ...and a man made pass. https://db.tt/6mqwhqR7 ....and this evening, Moonrise tonight: https://db.tt/2ePqHmrp -- Regards, Savageduck |
#37
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Super Moon eclipse
On 2015-09-25 16:37:05 +0000, PeterN said:
This Sunday there will be a super moon, followed by a partial eclipse. If any are interested in photographing it, check you local area for exact times and locations. There is a program that gives you specific information including times, where to look, etc. The PC version is free. http://photoephemeris.com/ Total eclipse, not partial. -- Michael |
#38
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Super Moon eclipse
On 9/26/2015 6:11 PM, nospam wrote:
In article , Mayayana wrote: | What would really be useful is an app to show you what's in front of you by using the camera. Then you wouldn't trip over anything while you look for the moon. such apps exist. And in your typical helpful, and non-confrontational manner, you have told us about one that works, and which is better in your opinion, and why. -- PeterN |
#39
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Super Moon eclipse
On 9/26/15 PDT 10:09 AM, nospam wrote:
In article , Mayayana wrote: | I would like an app which, when I turn around the phone, shows me | exactly where to expect the moon to rise, does such an app exist? | There's no need for an app. It's easy to find moon phase times online. Here's an example: http://www.calendar-365.com/moon/moon-phases.html it's much easier with an app on a phone that tells you where the moon is *now* and which can be checked while outside and not just for the moon either. Some apps on the iPhone don't require you to be outside at all. As long as you're in a location known to the phone, and it has a recent orientation, your WiFi or cell connection will do it all. Night Sky is one such app. |
#40
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Super Moon eclipse
On 9/26/15 PDT 5:30 PM, Ken Hart wrote:
On 09/26/2015 07:46 PM, Davoud wrote: RichA: Don't forget. Exposure times from unclipsed full moon and fully-eclipsed moon can vary from (at ISO 200) f/8 at 1/1000th to as much as 8 minutes(!need driven mounting). You're just as ignorant here as you are in sci.astro.amateur. You can't make an eight-minute exposure of the Moon; no telescope mount is designed to track it precisely for that length of time and manual guiding won't work over that length of time on a non-point source. Furthermore, the moon is very bright when full, fairly bright in full eclipse; I can't imagine any circumstance in which such a long exposure would be required. I typically photograph the Moon with a Questar Duplex https://www.flickr.com/photos/primeval/21181354091, 89mm aperture, FL 1400mm @ Ÿ16. Those who photograph the Moon at high-resolution and long focal lengths (up to 8 meters, in my case) typically use scientific imaging cameras such as those from Point Grey http://www.ptgrey.com/ to shoot video, then they use special software to choose the best frames and align and combine them. Sometimes, though, one can get lucky with a single DSLR exposure. See my 2009 photo at https://www.flickr.com/photos/primeval/21552899880/. Made with an 1100mm Ÿ7.3 astronomical telescope @ ISO 100 and 1/250 sec. That 8 minute exposure kind of threw me when I first saw it. I have photos of a full moon, that I shoot using the "Sunny-16" rule (shutter speed equals ISO, Full sun= f/16, etc.) at around f/5.6 or f/8. I was guessing that a "blood moon" would be a couple or three stops down from the light of a full moon. I'll shoot wide open, leaving ASA at my standard 200. I'll chimp each one until I get the exposure right. Has worked in the past, we'll see about this one. |
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