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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 27 Oct 2010 (Wednesday) 15:45
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You don't need a telescope

 
Badger49456
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Feb 27, 2012 14:13 |  #811

Hey Saiph, how long are you able to push your exposures at 200mm on the Astrotrac before you start to see trailing? From your flickr I see you're using 60s and 90s subs--can you go longer or does the Astrotrac inhibit that (or is it the light pollution that inhibits it?)? Thanks man!


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Harm
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Feb 27, 2012 14:21 |  #812

Badger49456 wrote in post #13977288 (external link)
Hey Saiph, how long are you able to push your exposures at 200mm on the Astrotrac before you start to see trailing? From your flickr I see you're using 60s and 90s subs--can you go longer or does the Astrotrac inhibit that (or is it the light pollution that inhibits it?)? Thanks man!

The point of the astrotrac is not to get any light trails. So you can only assume it is all based upon light pollution.


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Badger49456
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Feb 27, 2012 14:34 |  #813

What I mean to ask is--at 200mm--how good is the Astrotrac at keeping stars round as measured by how long of an exposure one can take? Could it go 5 minutes at 200mm without trailing? 10 minutes?


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Trugga
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Feb 27, 2012 15:17 as a reply to  @ Badger49456's post |  #814

Just a 550D on a tripod

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17-70 @ 17 plus x0.45 screw on front element

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17-70 @ 17

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100-400 @400 50% crop

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Assa
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Feb 27, 2012 17:00 |  #815

Here are some from Friday night...

Orion

IMAGE: http://farm8.staticflickr.com/7070/6936469025_6f4ee71882_b.jpg
IMAGE LINK: http://www.flickr.com …s/assa_photos/6​936469025/  (external link)

Pleiades
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M42 close up
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IMAGE LINK: http://www.flickr.com …s/assa_photos/6​936468935/  (external link)

I'm still very much a newbie to this and finding the focusing the main issue although I'm hoping next time to use my laptop and Liveview to get a better focus. Also just starting to get to grips with the power of PP RAW images. I took a shot of Andromeda duing this session and could just make out M31 as a smudge but it was too short an exposue and she was setting into the Birmingham glow at the time. Hopefully I'll soon get a chance to get a few shots in darker conditions with good focus and will see a bit more.



  
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Trugga
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Feb 27, 2012 17:21 |  #816

Assa wrote in post #13978440 (external link)
...was setting into the Birmingham glow at the time. Hopefully I'll soon get a chance to get a few shots in darker conditions...

I'm over near Wolverhampton - although I went over to the Long Mynnd on Saturday evening for my similar shots.

Lawrence




  
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trossite
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Feb 27, 2012 21:16 as a reply to  @ Trugga's post |  #817

My first shot at Orion's nebula tonight.
Not as smooth as I had hoped it would be, but first time trying it and was pretty happy that I was able to see it. Should I shoot at ISO 800 instead of 1600?

C&C / tips welcome.

f/5.6, 1 sec, 300mm, ISO 1600


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trossite
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Feb 27, 2012 21:35 as a reply to  @ trossite's post |  #818

I also got a shot of our moon with Jupiter and it's moons last night.


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SteveInNZ
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Feb 27, 2012 22:18 |  #819

That's excellent Trossite.


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VisualUniverse
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Feb 27, 2012 23:33 as a reply to  @ SteveInNZ's post |  #820

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Camera: modified Canon XSi
Lens: Zeiss Planar 50mm f/1.4 at f/2.5
Mount: AstroTrac
Filter: Astronomik CLS-CCD clip-in
Stack: 20 images at 150 seconds ea

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saiph
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Feb 28, 2012 03:24 |  #821

Badger49456 wrote in post #13977288 (external link)
Hey Saiph, how long are you able to push your exposures at 200mm on the Astrotrac before you start to see trailing? From your flickr I see you're using 60s and 90s subs--can you go longer or does the Astrotrac inhibit that (or is it the light pollution that inhibits it?)? Thanks man!

Hey,

I'll do 60s and 90s not because my Astrotrac isn't accurate enough but because of light pollution :/ I did a few shots beyond 90s and they all suffered from lower contrast due to washed out light-polluted backgrounds. The AT itself is just awesome. I think 5 minutes unguided won't be an issue if your location is dark enough :)
(You may check out this (external link) german guy who did some unguided 7-10 min. shots with 18 and 135mm)

Regards,
Saiph




  
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Edsport
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Feb 28, 2012 06:36 |  #822

trossite wrote in post #13980173 (external link)
I also got a shot of our moon with Jupiter and it's moons last night.

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Hosted photo: posted by trossite in
./showthread.php?p=139​80173&i=i188326140
forum: Astronomy & Celestial

If you zoom in it looks like you captured 3 of jupiter's moons. Great shot...


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archer1960
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Feb 28, 2012 08:49 |  #823

VisualUniverse wrote in post #13980933 (external link)
...

Camera: modified Canon XSi
Lens: Zeiss Planar 50mm f/1.4 at f/2.5
Mount: AstroTrac
Filter: Astronomik CLS-CCD clip-in
Stack: 20 images at 150 seconds ea

Awesome shot of Barnard's loop! Is that the full-size image, or is it cropped?


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trossite
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Feb 28, 2012 09:46 |  #824

Thank guys! Reading the Celestial forum has really sparked my intrest in astrophotography.

I was really trying to shoot Jupiter the last couple of nights to see if it was at all possible to get the bands to show up.
I just don't think my 300mm has the reach and i think i'm not getting the focus as sharp as it should be.
I know you have to expose for Jupiter and then the moons and make a compositie from the two.


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Got_Vtec?
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Feb 28, 2012 12:14 as a reply to  @ trossite's post |  #825

Mars

IMAGE: http://farm8.staticflickr.com/7055/6791115874_1b313604fe_b.jpg

Moon and Jupiter
IMAGE: http://farm8.staticflickr.com/7197/6791115740_ecf03ae993_b.jpg



  
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You don't need a telescope
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