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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 31 Dec 2009 (Thursday) 21:07
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The Official Shoot the Moon Thread

 
fotoi
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Post edited over 1 year ago by fotoi. (2 edits in all)
     
Mar 20, 2017 19:58 |  #4441

Cloudy full moon rising (March 12, 2017).


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andicus
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Post edited over 1 year ago by andicus.
     
Mar 20, 2017 21:34 as a reply to  @ fotoi's post |  #4442

Very nice mood for that shot, fotoi!


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fotoi
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Mar 20, 2017 21:44 |  #4443

andicus wrote in post #18306479 (external link)
Very nice mood for that shot, fotoi!

Thanks




  
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stevieray
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Mar 28, 2017 22:32 |  #4444

The one day old Moon this evening setting over the OC looking towards the South Bay. Used a Topcor 135mm f3.5 (from the 60s I believe).

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IMAGE LINK: https://flic.kr/p/SM57​sm  (external link) DSC08697 (external link) by Steve Christle (external link), on Flickr



  
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Pagman
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Apr 01, 2017 18:31 |  #4445

Yesterday afternoon's moon, just a quick hand held shot.


P.


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Olympus E-M1 and some Zuiko glass

  
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jgoetz4
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Apr 01, 2017 18:33 |  #4446

Taken a few yrs back with my old 40D, Da Bigma and 1.4x tc...


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6D, 10-22 (modified for the 6D) 7Artisans 25 1.8, Meike 35 1.7, Tamron 70-200 2.8 VC, Kenko Pro 1.4x tc
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jgoetz4
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Apr 01, 2017 18:35 |  #4447

Taken a few yrs back with my old 40D, Da Bigma and 1.4x tc...


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6D, 10-22 (modified for the 6D) 7Artisans 25 1.8, Meike 35 1.7, Tamron 70-200 2.8 VC, Kenko Pro 1.4x tc
Fuji X-E1 x2 and a bunch of FD glass
Fuji X100
Sky-Watcher 8'' Dobsonian

  
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nardes
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Apr 02, 2017 00:35 |  #4448

jgoetz4 wrote in post #18316979 (external link)
Taken a few yrs back with my old 40D, Da Bigma and 1.4x tc...
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Hosted photo: posted by jgoetz4 in
./showthread.php?p=183​16979&i=i27860141
forum: Astronomy & Celestial

Nice capture of the 4 Galilean moons too!

Cheers

Dennis




  
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Inspeqtor
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Apr 02, 2017 05:38 |  #4449

jgoetz4 wrote in post #18316979 (external link)
Taken a few yrs back with my old 40D, Da Bigma and 1.4x tc...
thumbnail
Hosted photo: posted by jgoetz4 in
./showthread.php?p=183​16979&i=i27860141
forum: Astronomy & Celestial

Nice shot!

What is/was the "Da Bigma"?


Charles
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TCampbell
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Post edited over 1 year ago by TCampbell.
     
Apr 02, 2017 10:57 |  #4450

I haven't posted to this thread in a long time because I don't often image the moon... but last night I had a mission. More on the "mission" in a moment... but first the moon.


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Shot with my 60Da using the TeleVue NP101is with TeleVue 2x PowerMate on a Losmandy G11 mount. The telescope is a 540mm f/5.4. With the PowerMate it is effectively a 1080mm f/11.


So about the "mission". Here in the US, there will be a total solar eclipse stretching coast to coast on August 21, 2017. It will begin in Oregon and makes it way across the country and exit through South Carolina. The entire country will see at least a partial eclipse (a minimum of 50% of the Sun will be eclipsed no matter where you live in the continental 48 states (sorry Alaska & Hawaii)). But there's a path stretching from coast to coast which is approximately 60 miles wide and if you're in that path, you'll experience totality.

The recognized expert on total solar eclipses as well as eclipse photography is a retired NASA physicist named Fred Espenak. Mr. Espenak goes by the nickname "Mr. Eclipse" and there's even a MrEclipse.com website. Though retired, he *still* does the eclipse predictions for NASA. If you know about the eclipse and have checked websites, news reports, etc. and they show the maps with the path of totality.... that's all Fred's data (you can thank Fred for knowing where to be on eclipse day -- or blame Fred if it's wrong (it won't be wrong... he's very good at this sort of thing.))

Fred was invited to be our keynote speaker for a huge astronomy outreach last September and as part of that event, the organizers and volunteers all do a lunch. Fred happened to select the seat next to me. During lunch, I happened to mention wanting to use my NP101is to image the event, but also wanting to use my 2x Powermate (TeleVue's name for a high-end focal length multiplier -- think of it as a 2x teleconverter... but designed for use on a telescope.)

Fred warned me about using any focal length multipliers or teleconverters to shoot an eclipse. He mentioned that they very often create reflections, but these reflections are usually not noticed because we aren't shooting intensely bright subjects. But shoot the Sun... and suddenly you've got enough light for the reflection to be a problem.

He described a test I should perform.

1) Wait fora night with a crescent moon.
2) Use the identical equipment you plan to use for the eclipse, to shoot the moon.
3) Compose the moon so it's at one side of the image (because the reflection will typically show up "opposite" the object and if it's centered you may not see it)
4) Deliberately over-expose the moon by 6-10 stops.

So... the "mission" was to take advantage of the crescent moon to conduct the test according to Fred's guidance. This lets us use the moon to simulate the size and brightness of the Sun during the eclipse.

Here is that test image.


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Tragically it looks like the PowerMate does indeed create a reflection -- so I won't be using this for the eclipse.



  
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MalVeauX
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Post edited over 1 year ago by MalVeauX. (3 edits in all)
     
Apr 02, 2017 11:01 |  #4451

TCampbell wrote in post #18317479 (external link)
Tragically it looks like the PowerMate does indeed create a reflection -- so I won't be using this for the eclipse.

I don't think you will see that reflection while using a solar filter, even a basic white light filter. My evidence is perhaps anecdotal, but I shoot the sun with barlows & powermates in white light and in narrow band and I don't get reflections, on anything from a short 80mm to a big 120mm refractor, and 150mm SCT. If you over-expose enough, you will see all kinds of things in the imaging train, even with a white light filter. Everything will bloat under the over-saturation and get bigger too. But while using a solar filter, this will not be the case, and you shouldn't see a reflection that stark at all. You would have to really push exposure to see something like that come up. Even if it did, it won't be on the disc or in its shadow and likely completely out of your FOV and not recorded.

This would only effect you shooting during totality with no filter, but then you won't have the exposed disc anyways causing the reflection.

You're good to go. :)

Very best,


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TCampbell
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Apr 02, 2017 11:46 |  #4452

MalVeauX wrote in post #18317483 (external link)
I don't think you will see that reflection while using a solar filter, even a basic white light filter. My evidence is perhaps anecdotal, but I shoot the sun with barlows & powermates in white light and in narrow band and I don't get reflections, on anything from a short 80mm to a big 120mm refractor, and 150mm SCT. If you over-expose enough, you will see all kinds of things in the imaging train, even with a white light filter. Everything will bloat under the over-saturation and get bigger too. But while using a solar filter, this will not be the case, and you shouldn't see a reflection that stark at all. You would have to really push exposure to see something like that come up. Even if it did, it won't be on the disc or in its shadow and likely completely out of your FOV and not recorded.

This would only effect you shooting during totality with no filter, but then you won't have the exposed disc anyways causing the reflection.

You're good to go. :)

Very best,

The two images where it may be a problem are the 'diamond ring' effect (shot about 9 to 7 seconds before totality ... and again between 7-9 seconds after the end of totality) and the 'bailey's beads' effect (usually around 1.5 seconds before totality and again 1.5 seconds after totality ends.)

For all other images such as the phases of totality shot through the filter and also the solar corona shot during totality with no filter) I don't think anything will be bright enough to create reflections.

I will have at least 2 cameras going (automatically controlled by my Mac running Solar Eclipse Maestro software) and probably a third (but that camera make either taking pictures of the crowd or using a very wide angle lens to capture the landscape and sky.

So now part of me is thinking... maybe I use one camera with the teleconverter, and another without. I only have the one apochromatic refractor (my SCT won't be coming with me because it has a 3556mm focal length -- too much for this event). So the other camera will either use my Canon EF 300mm f/2.8L IS USM with a 2x II ... or my EF 100-400mm f/4.5-5.6L IS USM II with a 1.4x III. I'll have to do more testing to decide which I prefer.

I'm sort of leaning toward taking the diamond ring at a very high f-stop (perhaps f/22) to deliberately create diffraction spikes on the sun during the shot. I can't do that with the telescope since the focal ratio isn't adjustable on a telescope... but it is on a camera lens.)




  
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jgoetz4
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Apr 02, 2017 14:34 |  #4453

nardes wrote in post #18317217 (external link)
Nice capture of the 4 Galilean moons too!

Cheers

Dennis

Thanks Dennis :-)


6D, 10-22 (modified for the 6D) 7Artisans 25 1.8, Meike 35 1.7, Tamron 70-200 2.8 VC, Kenko Pro 1.4x tc
Fuji X-E1 x2 and a bunch of FD glass
Fuji X100
Sky-Watcher 8'' Dobsonian

  
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jgoetz4
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Apr 02, 2017 14:34 |  #4454

Inspeqtor wrote in post #18317293 (external link)
Nice shot!

What is/was the "Da Bigma"?

Thank you. Da Bigma is the old Sigma 50-500mm lens


6D, 10-22 (modified for the 6D) 7Artisans 25 1.8, Meike 35 1.7, Tamron 70-200 2.8 VC, Kenko Pro 1.4x tc
Fuji X-E1 x2 and a bunch of FD glass
Fuji X100
Sky-Watcher 8'' Dobsonian

  
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Inspeqtor
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Apr 02, 2017 14:46 |  #4455

jgoetz4 wrote in post #18317669 (external link)
Inspeqtor wrote in post #18317293 (external link)
Nice shot!

What is/was the "Da Bigma"?

Thank you. Da Bigma is the old Sigma 50-500mm lens

Well now, I have that same lens and still use it! Great lens!


Charles
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Tokina AT-X Pro DX 11-20 f/2.8 * Sigma 17-70 f2.8-4 DC Macro OS * Sigma 150-500 f5-6.3 APO DG OS HSM
Canon 18-55 IS Kit Lens * Canon 70-300 IS USM * Canon 50mm f1.8 * Canon 580EX II

  
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