Results 1 to 3 of 3
  1. #1
    TonyBegg's Avatar
    TonyBegg is offline Main Sequence
    Points: 3,194, Level: 36
    Level completed: 96%, Points required for next Level: 6
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!
    Join Date
    Oct 2011
    Location
    Santa Fe, NM
    Posts
    89
    Points
    3,194
    Level
    36
    Thanks
    85
    Thanked 26x 18 Posts

    Default fixed transient camera



    I am not a beginner exactly but have been away from astronomy since 1980. I worked 1970-1980 doing computing with astronomers (UK-5 X-ray astronomy satellite, an interferometric spectrometer on the 100 inch Isaac Newton while at Herstmonceux, the Anglo Australian Telescope in its first year, and Chilbolton Radio Telescope). I would like to build a fixed all-sky transient camera with more light gathering power and resolution than those based on fish-eye lenses and a single sensor. Current idea is 7 cameras arranged to point as half of a duodecahedron. Researching cheapish CCD cameras and suitable 60+ degree FOV moderate aperture camera lenses. Just felt I should post somewhere, and beginner fits.

  2. #2
    Joe Lalumia's Avatar
    Joe Lalumia is offline HYPER GIANT
    Points: 61,001, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!Got three FriendsFirst 1000 Experience Points20+ Friends Achievement!
    Join Date
    Jun 2010
    Location
    Quinlan, Texas
    Posts
    10,947
    Points
    61,001
    Level
    100
    Thanks
    6,772
    Thanked 5,156x 3,400 Posts
    Blog Entries
    1

    Default

    Have you looked at these:
    SBIG 340 Monochrome All Sky Camera with Lens - AllSky-340 Fisheye - OPT Telescopes

    and these:
    And Maurice at JAT Observatory-- already operates a remote all sky camera system-- he can certainly give you good advice:
    JAT Observatory
    ETX 125PE, Stellarvue 80mm BV & Televue TelePod tripod,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8" LNT, 10x50, 15x70mm binoculars, Stellarvue binoviewers, solar filters for all three
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ..... plus a bunch of ham radios... Ham radio call sign - W1XWX

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    TelescopeMan Web Site

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    search for W1XWX to see my amateur radio web site

    "If you can't explain it to a six year old, you don't understand it yourself.” - Albert Einstein

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  3. #3
    TonyBegg's Avatar
    TonyBegg is offline Main Sequence
    Points: 3,194, Level: 36
    Level completed: 96%, Points required for next Level: 6
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!
    Join Date
    Oct 2011
    Location
    Santa Fe, NM
    Posts
    89
    Points
    3,194
    Level
    36
    Thanks
    85
    Thanked 26x 18 Posts

    Default Thank you Joe

    Hi Joe. Thank you for responding. I am perhaps over-thinking this problem but I have Googled myself silly the last few weeks and found off the shelf fish-eye lens type cameras from $399.95 (MoonGlow Technologies) via $899.95 (Orion) to $2195 (the SBIG one you mentioned). I have also looked at papers on such All Sky cameras by astronomers, some looking just to check the seeing - Cirrus clouds, some looking for aircraft so they can avoid them when they use a laser generated artificial star for their adaptive optics, some looking for transients such as meteors and aurorae. I read a paper by Robert Nemiroff concerning a negative result trying to find mag +5.5 or brighter transients with the CONCAM Night Sky Live network. He ends the paper suggesting increasing the aperture or decreasing pixel size for greater sensitivity. Fish-eye lenses have tiny effective apertures if I understand the optics correctly (does 8mm f/2.8 => 2.857 mm effective aperture? does 1.4 mm f/1.4 => 1 mm effective aperture?) whereas 35 mm full frame (FX?) wide-angle lenses have effective apertures of perhaps 14mm to 20mm. In terms of using consumer camera lenses we seem to be losing out with the miniaturization of CCD sensors and camera because even fast lenses then have almost pinhole effective apertures. I did find one multi-camera all-sky system - the California AllSky Meteor Surveillance with 20 Watec 902H2's and 12mm f1.2 lenses. My idea for 7 cameras arranged on duodecahedron faces came from the immersive media community (planetariums, IMAX) - Immersive Media's Dodeca 2360 which again looks to have tiny lenses but images almost the whole sphere! I would probably need 28 mm lenses (74 degree FOV) but would need full size (36 x 24 mm) sensors (that is a topic for a different thread)

 

 

Similar Threads

  1. Magnification with fixed camera body
    By WWPierre in forum Astronomy Digital Cameras Forum
    Replies: 29
    Last Post: 02-07-2013, 09:32 PM
  2. Shooting the Sky with a Fixed Camera without Star Trails
    By W. Watson in forum Amateur Astronomy Forum
    Replies: 9
    Last Post: 11-07-2007, 09:16 PM
  3. fixed
    By Starlord in forum Amateur Astronomy Forum
    Replies: 2
    Last Post: 08-06-2007, 06:17 PM
  4. Unexplained transient abberation in C 9-1/2 Celestron SCT
    By Uncle Bob in forum Amateur Astronomy Forum
    Replies: 11
    Last Post: 07-25-2006, 06:04 PM
  5. Spirit fixed
    By Linda in forum Amateur Astronomy Forum
    Replies: 12
    Last Post: 02-09-2004, 07:03 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 06:38 AM.