Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Guest
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 08 May 2017 (Monday) 13:43
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

Great American Eclipse, not so Great prep.

 
naanod
Hatchling
2 posts
Joined May 2017
     
May 08, 2017 13:43 |  #1

Recently picked up the Daystar Instruments Camera Quark (H-Alpha Prominence model) in preparation for the August 2017 eclipse. Can't seem to get anything but a red dot when I point it at the sun, any tips?


HOSTED PHOTO
please log in to view hosted photos in full size.



HOSTED PHOTO
please log in to view hosted photos in full size.




  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)
Celestron
Cream of the Crop
8,462 posts
Gallery: 1 photo
Likes: 332
Joined Jun 2007
Location: Texas USA
     
May 08, 2017 14:17 |  #2

If I were you I would contact the Daystar company and see what you might be doing wrong .




  
  LOG IN TO REPLY
pdxbenedetti
Senior Member
Avatar
312 posts
Gallery: 2 photos
Likes: 1019
Joined Jul 2015
Location: Salt Lake City, United States
     
May 08, 2017 17:05 |  #3

MalVeaux is the expert around here for this kind of stuff, but things that stand out to me would be your exposure, ISO, and focal length. At such a short focal length you're not going to get a tremendous amount of detail, you just can't resolve it. I would also lower your ISO to 400 or 200 (never shoot at the "in between" ISO's like 1250) and shoot faster exposures (like 1/100 or faster) or even record video. You need to be stacking hundreds or thousands of exposures to bring out any kind of detail, easiest way to do that is record video at 30 fps for a few minutes, a minute video at 30 fps is 1800 frames, load that video into software like PIPP, registax or autostakkert and then have it extract the individual frames, analyze the frames, and then stack the best 75% or so. You've shot 1/25 exposures at ISO 1250 and are blowing out highlights, which in the case of imaging something like the sun is basically everything. I'm not a 100% certain on this, but generally you want your histogram peak to be less than half exposed to keep highlights in check and preserve those details.


flickr (external link)
SmugMug (external link)
Facebook (external link)

  
  LOG IN TO REPLY
SiriusDoggy
Senior Member
Avatar
496 posts
Gallery: 2 photos
Likes: 286
Joined Aug 2006
     
May 08, 2017 21:26 as a reply to  @ pdxbenedetti's post |  #4

All very good advice.
Except for the eclipse you'll want to shoot stills because the moon will be moving across the surface of the sun over the course of a minute or so.

You ISO is way too high and you are over exposed. At this exposure it's difficult to tell if you've achieved focus. It's possible you may need an extension tube but unlikely. I think this device is designed to be attached to the lens exactly like you have it.


Canon 5D Mark II & Mark III 50mm 1.4, 16-35mm 2.8L, 24-70mm 2.8L, 24-104 4L, 70-200mm 2.8 IS L, 100-400mm 5.6-6.3L, 600mm 4L, 24mm 3.5 T/S L, 16mm 2.8 Zenitar Fisheye, Rokinon 24mm, 35mm, 85mm T1.5 Cine set

  
  LOG IN TO REPLY
SiriusDoggy
Senior Member
Avatar
496 posts
Gallery: 2 photos
Likes: 286
Joined Aug 2006
     
May 08, 2017 21:29 |  #5

BTW, Better to be figuring this out on May 8th instead of August 20th.


Canon 5D Mark II & Mark III 50mm 1.4, 16-35mm 2.8L, 24-70mm 2.8L, 24-104 4L, 70-200mm 2.8 IS L, 100-400mm 5.6-6.3L, 600mm 4L, 24mm 3.5 T/S L, 16mm 2.8 Zenitar Fisheye, Rokinon 24mm, 35mm, 85mm T1.5 Cine set

  
  LOG IN TO REPLY
SteveInNZ
Goldmember
1,415 posts
Likes: 49
Joined Nov 2007
Location: Auckland, New Zealand
     
May 08, 2017 23:26 |  #6

Starting with the obvious - Did you have it plugged into a suitable 5V source and wait for the LED to turn green ? Your photo doesn't show a power source. If you are using one of the portable phone charger things, I found that they kept turning off when the Quark got to temperature.
Set your exposure from the red histogram peak. The others and the luminance histogram and the camera meter will be confused by the pure red light.

Steve.


"Treat every photon with respect" - David Malin.

  
  LOG IN TO REPLY
naanod
THREAD ­ STARTER
Hatchling
2 posts
Joined May 2017
     
May 10, 2017 13:42 |  #7

Thanks all! I'll give it another go when the weather clears up here.




  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

1,299 views & 1 like for this thread
Great American Eclipse, not so Great prep.
FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is PhotosByLena
506 guests, 406 members online
Simultaneous users record so far is 6430, that happened on Dec 03, 2017

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.