Page 3 of 11 FirstFirst 12345 ... LastLast
Results 21 to 30 of 108
Like Tree2Likes

Thread: PHD graphs I'll show you mine if...

  1. #21
    alsetalokin's Avatar
    alsetalokin is offline HYPER GIANT
    Points: 36,116, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience PointsGhost Achievement! Averaging 5+ posts a day!Got three Friends20+ Friends Achievement!
    Join Date
    May 2010
    Location
    Toronto
    Posts
    1,506
    Points
    36,116
    Level
    100
    Thanks
    110
    Thanked 633x 441 Posts

    Default



    Hmm.
    I haven't tried any exposures longer than 2 minutes lately because of the LP around here, but I've done lots of 2 minute guided exposures with no trails evident, and I also have a rather choppy graph most of the times.

    I am much better balanced now that I've done some measurements and made some markings on my mounting hardware, and it really does make a difference. Apparently the CGEM likes to be Heavy but balanced and "biased" correctly, for smooth performance and nice noises. I haven't had the "can of rocks" sound in a long time.

    The only way I can get a longer exposure to check is to put a filter on or reduce the ISO setting and take a long exposure that way. I'll try it tonight and see what happens.
    Meanwhile here's a typical graph from last night's session, while imaging on NGC6910.
    And a single 120-second subframe minimally processed in UFRaw and Gimp. No nebulosity with just the single frame, but I haven't gotten a good stack result yet.
    Attached Images Attached Images
    Last edited by alsetalokin; 09-01-2010 at 06:46 PM.

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

    ETX125AT guiding WO Megrez 90 Apo/CGEM mount w/ polar scope
    WO Multiple Reticle Red Dot finder, Celestron SkyMaster 8x56 binos
    26mm SP, 12.4 mm SP, 8.8 mm UWA, 12 mm MA illuminated reticle, 2x Barlow, 3.5mm and 31mm Hyperions, TV 2008
    Meade DSI Pro II monochrome CCD; Meade LPI; Celestron NexImage; Canon EOS RebelXTi
    EQ-1 mount (emergency use only!)

  2. The Following 2 Users Say Thank You to alsetalokin For This Useful Post:

    admin (09-05-2010),Skyhawk727 (09-03-2010)

  3. #22
    admin's Avatar
    admin is offline Administrator
    Points: 6,989,798, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 5.0%
    Achievements:
    First 1000 Experience PointsGot three Friends20+ Friends Achievement!5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Mar 2007
    Location
    Sydney, Australia
    Posts
    13,476
    Points
    6,989,798
    Level
    100
    Thanks
    18,563
    Thanked 7,915x 3,807 Posts
    Blog Entries
    2

    Default

    What are your settings for guide pulses (per second)?
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

    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.
    | My Astronomy Blog

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


  4. #23
    alsetalokin's Avatar
    alsetalokin is offline HYPER GIANT
    Points: 36,116, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience PointsGhost Achievement! Averaging 5+ posts a day!Got three Friends20+ Friends Achievement!
    Join Date
    May 2010
    Location
    Toronto
    Posts
    1,506
    Points
    36,116
    Level
    100
    Thanks
    110
    Thanked 633x 441 Posts

    Default

    Quote Originally Posted by admin View Post
    What are your settings for guide pulses (per second)?
    Er...I guess I don't even know. Is that in the "brain" somewhere? Other than the settings that are available on the graph window, and checking the binning for the NR settings, I think I'm using defaults all in there. Since I don't understand what most of the stuff means or does....

    Any advice would be appreciated.
    Thanks--
    --Al

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

    ETX125AT guiding WO Megrez 90 Apo/CGEM mount w/ polar scope
    WO Multiple Reticle Red Dot finder, Celestron SkyMaster 8x56 binos
    26mm SP, 12.4 mm SP, 8.8 mm UWA, 12 mm MA illuminated reticle, 2x Barlow, 3.5mm and 31mm Hyperions, TV 2008
    Meade DSI Pro II monochrome CCD; Meade LPI; Celestron NexImage; Canon EOS RebelXTi
    EQ-1 mount (emergency use only!)

  5. #24
    Skyhawk727's Avatar
    Skyhawk727 is offline SUPER GIANT
    Points: 20,235, Level: 98
    Level completed: 34%, Points required for next Level: 265
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!200+ Posts Achievement!1000 Days+ Registered Achievement!
    Join Date
    Jul 2009
    Location
    Illinois
    Posts
    1,011
    Points
    20,235
    Level
    98
    Thanks
    601
    Thanked 437x 350 Posts

    Default M20

    Well here I am again. This is my first try at M20 with guiding and a little processing. By a little I mean I subtracted 1 dark frame. I'm reading about flats, darks and bias frames and it's slowly starting to sink in. I do mean slowly. I have some artifacts which others have told me I can subtract with bias frames, but I think I'll live with them until I figure darks out. I'm not too quick at figuing this stuff out.

    The guiding graph is what I got after 30 minutes on the target. Have found that even moving to a nearby target causes the mount a while to settle down.

    Also I'm working on balance. Dec balance is really good through a wide range. Ra. on the other hand insists on precessing westerly, albiet gently. I would rather an Easterly precession to insure good gear meshing, but no matter what I do, Westerly it is. The pier is plumb to within .1 degree and the wedge perfectly level N/S and E/W.

    Meade 10" LX200GPs @f6.3, DSI III pro 8, 120 seconds stacked in Registax, single dark subtraction, guided DSI IIC 5 seconds, TV Pronto 480MM FL.

    The graph is just before I started imaging, but had moved from M27 to M20. Probably should have done a recalibration. Forgot to do a capture of the actual guide graph, but thought this might be interesting.

    Dave
    Attached Images Attached Images
    LX200ACF 10" in observatory, TeleVue Pronto, Astro Tech AT65EDQ, ZWO ASI120MC, SBIG 8300M, SBIG FW5 filter wheel, Baader LRGB and 7nm Ha filter.
    Other hobbies: flying, history and woodworking,

  6. The Following User Says Thank You to Skyhawk727 For This Useful Post:

    admin (09-04-2010)

  7. #25
    alsetalokin's Avatar
    alsetalokin is offline HYPER GIANT
    Points: 36,116, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience PointsGhost Achievement! Averaging 5+ posts a day!Got three Friends20+ Friends Achievement!
    Join Date
    May 2010
    Location
    Toronto
    Posts
    1,506
    Points
    36,116
    Level
    100
    Thanks
    110
    Thanked 633x 441 Posts

    Default

    Not bad, that's a very nice image.
    I am continually amazed at how well the DSI series imagers work. I can't wait until my guider arrives and I can get back to taking pictures with my DSI II.

    Now...I can see some dusticles in there; perhaps you've got a speck on your sensor that can be brushed away, but before you do that, Shoot some Flats with the same dust speckles and add them to your stack. If they are done right they will get rid of those dust donuts.

    The PHD graph...the upward drift in DEC indicates that your polar alignment wasn't as good as it might have been, but the system corrected for it once it noticed it. Correct, drift, correct, drift...the drift is always at the same angle (rate) and in the same direction; this indicates a bit of misalignment on the NCP. Check to see if the Hinge on your wedge is aligned exactly east-west using something like a big carpenter's square and sighting along it to the NCP, (not Polaris).
    I don't know what's going on on the RA, probably balance like you said. Should be easy to fix by moving a counterweight slightly to get your desired "precessing" as you call it. You may have to install a counterweight bar on the rotating platform or something.

    Regardless of the small tracking error the picture came out nice and sharp.
    Now for those flats....

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

    ETX125AT guiding WO Megrez 90 Apo/CGEM mount w/ polar scope
    WO Multiple Reticle Red Dot finder, Celestron SkyMaster 8x56 binos
    26mm SP, 12.4 mm SP, 8.8 mm UWA, 12 mm MA illuminated reticle, 2x Barlow, 3.5mm and 31mm Hyperions, TV 2008
    Meade DSI Pro II monochrome CCD; Meade LPI; Celestron NexImage; Canon EOS RebelXTi
    EQ-1 mount (emergency use only!)

  8. #26
    ghswen's Avatar
    ghswen is offline Super Moderator
    Points: 161,346, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 13.0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience Points365 Days+ Registered Achievement!Visitor Messenger Achievement!750 Days+ Registered Achievement!
    Join Date
    Jul 2009
    Location
    Southern California, USA
    Posts
    11,061
    Points
    161,346
    Level
    100
    Thanks
    6,854
    Thanked 7,499x 4,418 Posts

    Default

    Well the winds died out tonight and I finally got the current screen print with the finder/guider setup. It really is working quite well. I can get significantly more guide stars and since it is much lighter it helps with the weight issue.

    Anyway here's how well it is working.
    Attached Images Attached Images
    Gordon
    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.
    :
    Explore Scientific ED80CF,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    254N,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80, Orion Atlas EQ-g mount, Orion SSAG guider. Baader MPCC MkIII
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    corrector, Vixen 70mm refractor. Lunt LS35THa solar
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    . Skywatcher EQ5pro mount. Imagers: ZWO ASI1600 MM Cool, ZWO ASI174mm-C (for use with my Quark chromosphere), ZWO ASI120MC Filters: LRGB, Ha 7nm, O-III 7nm, S-II 7nm Eyepieces: a few, Primary
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    Cartes du Ciel, EQMOD, SGP,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Photoshop, StarTools V1.4
    Blog:
    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.
    ******************************

  9. The Following User Says Thank You to ghswen For This Useful Post:

    admin (09-05-2010)

  10. #27
    Skyhawk727's Avatar
    Skyhawk727 is offline SUPER GIANT
    Points: 20,235, Level: 98
    Level completed: 34%, Points required for next Level: 265
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!200+ Posts Achievement!1000 Days+ Registered Achievement!
    Join Date
    Jul 2009
    Location
    Illinois
    Posts
    1,011
    Points
    20,235
    Level
    98
    Thanks
    601
    Thanked 437x 350 Posts

    Default Nice graph

    OK guys... somebody should beat me over the need to do flats, darks and bias frames. I understand the concept, just haven't figured out the process yet... still reading. Does anybody know a good simple - get started guide - for this?

    Alignment and guiding seems good enough to move on to preprocessing.

    Cut to tonite's picture. M33, A stack of 15, 5 minute subs on the DSI III pro binned 2X2. As the target was in the east, my balance was against the RA gear and the graph shows the improvement. Everything worked well until I dewed up and my toes got cold... hate the cold and it's still summer - 45 degrees! Don't move to Northern Illinois!

    While the image itself is nowhere the quality I'm seeking, for 5 minute subs, my stars are reasonably round. Improvement comes slowly.

    A grasshopper walks into a bar and the bartender says; "Hey we've got a dring named after you". The Grasshopper says; "Why would you name a drink Bob?"

    Dave
    Attached Images Attached Images
    LX200ACF 10" in observatory, TeleVue Pronto, Astro Tech AT65EDQ, ZWO ASI120MC, SBIG 8300M, SBIG FW5 filter wheel, Baader LRGB and 7nm Ha filter.
    Other hobbies: flying, history and woodworking,

  11. The Following User Says Thank You to Skyhawk727 For This Useful Post:

    admin (09-05-2010)

  12. #28
    alsetalokin's Avatar
    alsetalokin is offline HYPER GIANT
    Points: 36,116, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience PointsGhost Achievement! Averaging 5+ posts a day!Got three Friends20+ Friends Achievement!
    Join Date
    May 2010
    Location
    Toronto
    Posts
    1,506
    Points
    36,116
    Level
    100
    Thanks
    110
    Thanked 633x 441 Posts

    Default

    Well done, that looks bang on. Your graph is much cleaner than mine usually are. I'm jealous.
    Plus I've been trying to image M33 for weeks and one thing or another always happens.

    Nicely done !

    Flats aren't mysterious, they are just a pain. You simply need to take a series of exposures of an evenly-illuminated field. You can do it at dawn or evening twilite even. Just point your focused imaging system at an evenly illuminated part of the sky and take about 30 frames on "auto" exposure (which will be very short for the DSI). You want a frame that isn't overexposed; it should be a "zone 5 or 6" if that means anything to you: a fairly bright neutral grey. It should show the dust particles and the scope's vignetting, but barely. The camera orientation and focus and all that should be exactly the same as when you took the lights.
    Then include them in your stack and they should correct for the dust speckles and vignetting and some other artifacts.
    Bias frames are simply shot at very very short exposures with the imager covered up tight so no light gets in. They are a "baseline" and are used to calibrate the dark frames.

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

    ETX125AT guiding WO Megrez 90 Apo/CGEM mount w/ polar scope
    WO Multiple Reticle Red Dot finder, Celestron SkyMaster 8x56 binos
    26mm SP, 12.4 mm SP, 8.8 mm UWA, 12 mm MA illuminated reticle, 2x Barlow, 3.5mm and 31mm Hyperions, TV 2008
    Meade DSI Pro II monochrome CCD; Meade LPI; Celestron NexImage; Canon EOS RebelXTi
    EQ-1 mount (emergency use only!)

  13. #29
    blaise's Avatar
    blaise is offline Bright Giants
    Points: 16,059, Level: 87
    Level completed: 46%, Points required for next Level: 191
    Overall activity: 0%
    Achievements:
    10 Days registered200+ Posts Achievement!First 1000 Experience Points365 Days+ Registered Achievement!100+ Threads Achievement!
    Join Date
    Oct 2009
    Location
    SC
    Posts
    597
    Points
    16,059
    Level
    87
    Thanks
    80
    Thanked 248x 146 Posts

    Default

    Great stuff Dave. I'm really impressed. With the help of posters here, I have been able to increase my exposure time from 2 to 5 minutes on a mediocre GEM.

    If you would like to start a seperate thread in the "Astrophotography Image Processing Forum," I would be glad to help you as much as I can, as will others as they come across the thread.
    AT6RC, AT72ED,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80 (guide scope), Celestron 8, SW254N, Canon 450D, Meade DSI (guide cam), Celestron CGEM DX

  14. #30
    ghswen's Avatar
    ghswen is offline Super Moderator
    Points: 161,346, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 13.0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience Points365 Days+ Registered Achievement!Visitor Messenger Achievement!750 Days+ Registered Achievement!
    Join Date
    Jul 2009
    Location
    Southern California, USA
    Posts
    11,061
    Points
    161,346
    Level
    100
    Thanks
    6,854
    Thanked 7,499x 4,418 Posts

    Default

    Dave,

    I don't use flats or bias frames for my DSI IIc. I do all my post processing in Nebulosity and only use a "bad pixel map" instead of taking a bunch of darks each session. There are some requirements to do it this way but the process is very simple and fast.
    Since I don't use a focal reducer or any other filters at this point I don't get any vignetting in my images so haven't found the need for flats.

    I'm still in the "post processing" learning curve (aren't we all!) but have had some fairly good results.
    Gordon
    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.
    :
    Explore Scientific ED80CF,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    254N,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80, Orion Atlas EQ-g mount, Orion SSAG guider. Baader MPCC MkIII
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    corrector, Vixen 70mm refractor. Lunt LS35THa solar
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    . Skywatcher EQ5pro mount. Imagers: ZWO ASI1600 MM Cool, ZWO ASI174mm-C (for use with my Quark chromosphere), ZWO ASI120MC Filters: LRGB, Ha 7nm, O-III 7nm, S-II 7nm Eyepieces: a few, Primary
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    Cartes du Ciel, EQMOD, SGP,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Photoshop, StarTools V1.4
    Blog:
    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.
    ******************************

 

 
Page 3 of 11 FirstFirst 12345 ... LastLast

Similar Threads

  1. Replies: 2
    Last Post: 12-05-2010, 05:58 AM
  2. Son of: I'll show you mine...PemPro Graphs
    By Skyhawk727 in forum CCD Imaging Forum
    Replies: 4
    Last Post: 10-10-2010, 02:17 AM
  3. Replies: 1
    Last Post: 06-15-2004, 08:29 AM
  4. Mine yes have beheld - mine eyes have beheld!
    By Richard in forum UK Astronomy Forum
    Replies: 1
    Last Post: 06-08-2004, 09:34 AM

Tags for this Thread

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 06:48 PM.