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Post by Deleted on Jun 25, 2014 0:09:10 GMT
I have been trying a 0.8 Focal Reducer in combination with my Hyperstar Lens. The Hyperstar Lens is F2 and in combination with a 0.8 Focal Reducer the overall Focal Reduction is about F1.6. I have a preliminary verification in daylight at a target about 5 miles away as the crow flies. I think, based on the Mallincam "8 mm Plossol eyepiece view" with the compound Focal Reducer, I am seeing a true FOV of about 0.7 Degrees (need to verify with the Moon). Cloudy Nights (no pun intended) here for the next few days. Will try to Bcast this combo on NSN when the skies clear a bit (LOL).
My goal is to get bright Neb's / GC's in less than 2 seconds with a final goal of Real Time Video. I got close with M42 a couple months ago at 2.3 seconds exposure time, using the Hyperstar only with a FOV of about 0.5 Degrees.
Any Thoughts / Information / Advise is Welcome, as I do not see any information on using a Hyperstar Lens in this manner. I have sent an e-mail to Starzonia (maker of the Hyperstar Lens), but do not expect a reply soon (I know... hey there's another Video Nut on the loose).
Cheer's Patrick
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Post by Dragon Man on Jun 25, 2014 2:46:16 GMT
Sounds interesting if it works Pat. Using it on the night sky will expose any Vignetting or Coma which doesn't normally show up in daylight testing.
As a rough guide to your FOV, the full size of M42 Orion Nebula is 1 degree, and the full Moon is half a degree.
My current set-up has me at 1 degree. I like the FOV that wide.
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Post by Deleted on Jun 25, 2014 4:35:39 GMT
Sounds interesting if it works Pat. Using it on the night sky will expose any Vignetting or Coma which doesn't normally show up in daylight testing. As a rough guide to your FOV, the full size of M42 Orion Nebula is 1 degree, and the full Moon is half a degree. My current set-up has me at 1 degree. I like the FOV that wide. Was able to get M5 at 0.4 sec, blows core at 0.8 sec thru clouds no less. No Vignetting, no Coma. Unable to get sharp photo or Focus due to cloud cover. Looks Promising so far. Cloud cover at 90% tonight. A good start with poor seeing conditions. Looks like live video at 0.8 sec. Did not push the envelope tonight. Thanks Patrick
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Post by Dragon Man on Jun 25, 2014 6:40:28 GMT
That's does sound promising Pat. keep us up to date, and we want photos or it didn't happen
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Post by Deleted on Jun 25, 2014 16:18:24 GMT
That's does sound promising Pat. keep us up to date, and we want photos or it didn't happen Pics of M17 and M20 at F1.6 and 2.3 sec exposure. Clouds started to clear, and got a couple of pics. Will try again when Skies are better. If you size your browser to show 3 pictures wide, you can compare F5 at 30 sec, F2 at 10 sec and F1.6 at 2.3 sec. No stacking, just Miloslick and Grab. The 4 cables for the mallincam show in some of the stars also a few hot pix that I did not remove. Cheers Patrick www.flickr.com/photos/skywatch_utah/sets/72157635347769845/
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Post by Dragon Man on Jun 25, 2014 16:24:24 GMT
Wow Pat, nice work. That is a fantastic example of differing focal ratios/reducers.
I like the FOV with the f1.2 @ 2.3 seconds! I like a wide FOV. Strange that it is so dark though for being so fast a focal length.
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Post by Deleted on Jun 25, 2014 17:10:25 GMT
Wow Pat, nice work. That is a fantastic example of differing focal ratios/reducers. I like the FOV with the f1.6 @ 2.3 seconds! I like a wide FOV. Strange that it is so dark though for being so fast a focal length. Used Histogram and sliders on Milo with Lumicon Deep Sky LP Filter. Took a few images at different settings (overexposed, underexposed....) and picked the best to post. Most were poor (overexposed) and no way to fix them. Updated Posts for 0.8X FR and Hyperstar = F1.6. Thanks Patrick
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Post by Deleted on Jun 26, 2014 18:53:38 GMT
That's does sound promising Pat. keep us up to date, and we want photos or it didn't happen Pics of M17 and M20 at F1.6 and 2.3 sec exposure. Clouds started to clear, and got a couple of pics. Will try again when Skies are better. If you size your browser to show 3 pictures wide, you can compare F5 at 30 sec, F2 at 10 sec and F1.6 at 2.3 sec. No stacking, just Miloslick and Grab. The 4 cables for the mallincam show in some of the stars also a few hot pix that I did not remove. Cheers Patrick www.flickr.com/photos/skywatch_utah/sets/72157635347769845/Some lovely pics there Pat! Very nice! But to be honest the ones at f1.6 look dodgy Getting bad coma? on some of your stars. Looks much nicer at f2 I think.
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Post by Deleted on Jun 26, 2014 19:07:16 GMT
Yes I believe you are correct Chris. I set up with Hyperstar only last night to try a 5 to 10 second stack in Hyper mode. Had a problem with Alignment with a new Hand Controller (operator error). Will continue to look at in the near future. Thanks Patrick
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