Results 1 to 9 of 9
Like Tree3Likes
  • 1 Post By TimH1618
  • 2 Post By TimH1618

Thread: xx14 DSLR focusing issue

  1. #1
    TimH1618's Avatar
    TimH1618 is offline White Dwarf
    Points: 47, Level: 1
    Level completed: 94%, Points required for next Level: 3
    Overall activity: 4.0%
    Achievements:
    2 Posts Achievement
    Join Date
    Jan 2019
    Location
    Massachusetts USA
    Posts
    3
    Points
    47
    Level
    1
    Thanks
    0
    Thanked 0x 0 Posts

    Default xx14 DSLR focusing issue



    Hello to the forum. New member here. I recently became the (very) happy owner of an xx14. I tried to take a first stab at prime-focus photography and couldn't get Sirius to even come close to focus. I've been experimenting in the daytime and concluded the following: I can focus my Canon T3 on trees a few hundred feet away. As I get out to about 1/4 mile, the body of the T3 is up against the focuser housing. So the focal point is down in there, I guess. Is there anyway to get this to work? Do I need to get a low-profile focuser, and do such exist? Is there some sort of optical solution? (I have the Astromania eyepiece-projection adapter and have had success with it). Thanks for any help. -- Tim

  2. #2
    KathyNS's Avatar
    KathyNS is online now Super Moderator
    Points: 172,441, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.6%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience Points400+ Posts AchievementGot three Friends
    Awards:
    Reply Award
    Join Date
    Nov 2010
    Location
    Nova Scotia
    Posts
    25,141
    Points
    172,441
    Level
    100
    Thanks
    6,658
    Thanked 14,974x 9,534 Posts
    Blog Entries
    3

    Default Re: xx14 DSLR focusing issue

    Welcome to the forum.

    That is normal for Newtonians. The focal point is down where the barrel of the eyepiece would be. There is no way to get the camera sensor down there due to the depth of the body of the camera.

    The quick and dirty solution is to add a barlow. However, that doubles the focal length of the scope and the focal ratio, requiring 4x as much exposure time.

    Some folks move the mirror up the tube far enough to bring the focal point out enough to meet the sensor. That can be done by drilling holes to remount the mirror cell farther up the tube, or some people are able to use extra-long collimation screws to place the mirror farther up in the mirror cell. Or you could get a shorter focuser, if one is available that will fit your scope.

    Any of those scope modifications will give you the opposite problem when it comes to focusing an eyepiece. You would likely need an extension tube in order to focus eyepieces.

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


    DSO AP:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    (pier);
    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.

  3. #3
    Juno16's Avatar
    Juno16 is offline SUPER GIANT
    Points: 12,439, Level: 77
    Level completed: 12%, Points required for next Level: 311
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!50 Posts Achievement!
    Join Date
    May 2016
    Location
    South Mississippi
    Posts
    1,471
    Points
    12,439
    Level
    77
    Thanks
    1,294
    Thanked 796x 576 Posts

    Default Re: xx14 DSLR focusing issue

    Hi Tim and welcome to AF.

    The XX14g must be a reflector?

    I see that you are in MA. I grew up in Worcester. I see that it’s 7 degrees F there right now. I’ve been down south for many years. It was fun growing up in that cold weather, but I don’t miss it now!

    Thanks,
    Jim

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : Explore Scientific ED102 Triplet APO,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    130 SLT.
    Mounts: Celestron AVX with
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    MM Autoguider, SLT; Binoculars: Bushnell 10X50;
    Camera: Nikon D3300 and D5300(unmodded),
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Tool, PHD2, SharpCap v3.2, StarTools, PE14
    Dog: Jack
    Astro Photos https://flickr.com/photos/157183480@N07/sets/72157707681236785

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

  4. #4
    TimH1618's Avatar
    TimH1618 is offline White Dwarf
    Points: 47, Level: 1
    Level completed: 94%, Points required for next Level: 3
    Overall activity: 4.0%
    Achievements:
    2 Posts Achievement
    Join Date
    Jan 2019
    Location
    Massachusetts USA
    Posts
    3
    Points
    47
    Level
    1
    Thanks
    0
    Thanked 0x 0 Posts

    Default Re: xx14 DSLR focusing issue

    Thank you so much Kathy and Jim for your quick replies! Very welcoming environment here at the forum! Speaking of environment, yes Jim, I was outside this morning doing my camera tests. It was 4 degrees Fahrenheit. Was -4 this morning. I live ten miles south of Worcester in Sutton. I was wearing a Selk Bag (see Google) and looked pretty ridiculous.

    I have a 2x Barlow so I can try that, otherwise, it's back to eyepiece projection. Can I get some sort of CCD astrophotography camera that will fit down in the focuser? Am I naive to think my expensive scope should do prime focus photography? Thanks again.
    Juno16 likes this.

  5. #5
    Hillrat's Avatar
    Hillrat is offline SUPER GIANT
    Points: 7,529, Level: 60
    Level completed: 90%, Points required for next Level: 21
    Overall activity: 13.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Jul 2017
    Location
    Saskatchewan, Canada
    Posts
    1,255
    Points
    7,529
    Level
    60
    Thanks
    319
    Thanked 380x 267 Posts

    Default Re: xx14 DSLR focusing issue

    In the odd instance the camera can be screwed directly on to the focus draw tube. (with the right adapter) This may get your sensor close enough.

  6. #6
    KathyNS's Avatar
    KathyNS is online now Super Moderator
    Points: 172,441, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.6%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience Points400+ Posts AchievementGot three Friends
    Awards:
    Reply Award
    Join Date
    Nov 2010
    Location
    Nova Scotia
    Posts
    25,141
    Points
    172,441
    Level
    100
    Thanks
    6,658
    Thanked 14,974x 9,534 Posts
    Blog Entries
    3

    Default Re: xx14 DSLR focusing issue

    Don't put too much effort into getting your camera to work with that scope. On a Dobsonian mount, you will be limited with what you can do, anyway. Long exposures are out: you wil be limited to 30 seconds at a time. It's just not designed for astrophotography.

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


    DSO AP:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    (pier);
    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.

  7. #7
    Pauls72's Avatar
    Pauls72 is offline HYPER GIANT
    Points: 19,065, Level: 95
    Level completed: 42%, Points required for next Level: 235
    Overall activity: 74.0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!3 Years + Achievement
    Join Date
    Jul 2009
    Location
    LaPorte, IN USA
    Posts
    1,957
    Points
    19,065
    Level
    95
    Thanks
    6
    Thanked 655x 507 Posts

    Default Re: xx14 DSLR focusing issue

    Newtonian's and other scopes that are specifically designed for AP (AstroPhotography) are called Astrographs.
    You might be able to gain enough inward focus on your scope by going with a low profile focuser like these:
    https://www.amazon.com/Orion-13036-L.../dp/B0090CZGB2
    https://agenaastro.com/antares-low-p...ual-speed.html
    But has been said, AP on that scope with it being an Alt/Az (Altitude/Azimuth) mount will be a challenge.

    The best scopes to learn DSO AP with are short fast Refractors on an EQ (equatorial) mount that can track and be guided.
    Astrograph Newtonian's are OK for DSO AP. But you need a large heavy EQ mount.
    SCT's and MCT's are good for doing AP on the Moon, planets and other very bright objects.
    The xx14 is a good scope for visual use, but it is a poor choice for AP. Unfortunately visual observing and AP have totally different equipment requirements. You don't need a large aperture scope to do AP.
    Last edited by Pauls72; 02-01-2019 at 01:41 AM.
    Mounts: EQ1, LXD55, Atlas EQ-G (one with Rowan belt mod, EQ6-Rail and one without)
    Scopes: C11, 8" Reflector, 102mm MCT, ST80, W.O. FLT98, 6" RC, Lunt LS50THa/B400
    Cameras: Canon XTi, DSI-C, DSI, ST402, QHY8L, QHY183C, QHY163M, ASI120MC-S (Allsky)
    Some of my Pic's http://www.astrobin.com/users/Pauls72/

  8. #8
    TimH1618's Avatar
    TimH1618 is offline White Dwarf
    Points: 47, Level: 1
    Level completed: 94%, Points required for next Level: 3
    Overall activity: 4.0%
    Achievements:
    2 Posts Achievement
    Join Date
    Jan 2019
    Location
    Massachusetts USA
    Posts
    3
    Points
    47
    Level
    1
    Thanks
    0
    Thanked 0x 0 Posts

    Default Re: xx14 DSLR focusing issue

    Thanks again everyone for the help. I didn't buy the xx14 for astrophotography so I'm not too disappointed. Will experiment with eyepiece projection. -- Tim
    Juno16 and kanadalainen like this.

  9. #9
    Rick150's Avatar
    Rick150 is offline White Dwarf
    Points: 180, Level: 3
    Level completed: 60%, Points required for next Level: 20
    Overall activity: 25.0%
    Achievements:
    2 Posts Achievement
    Join Date
    Jul 2019
    Location
    New Zealand
    Posts
    9
    Points
    180
    Level
    3
    Thanks
    0
    Thanked 0x 0 Posts

    Default Re: xx14 DSLR focusing issue

    It took a while but I fixed the AZ/EL backlash to zero, fitted the correct counterweights to compensate for the DSLR and what great 30s+ images of M83. Another thing is that you must have your base exactly level, about right is not good enough and I would state that unless you have the mount tracking like velvet then you will run into problems but as yet my xx14g has not disappointed.

 

 

Similar Threads

  1. RC Focusing Issue/Question
    By Smokehouse in forum Telescope Forums
    Replies: 3
    Last Post: 07-31-2015, 03:18 AM
  2. Focusing Issue
    By chris_annee in forum Astronomy Beginners Forum
    Replies: 4
    Last Post: 08-12-2013, 12:24 PM
  3. Newbie with focusing issue
    By BMOMA in forum Astronomy Beginners Forum
    Replies: 8
    Last Post: 12-27-2011, 07:01 PM
  4. LX200 focusing issue
    By Orion in forum Amateur Astronomy Forum
    Replies: 4
    Last Post: 09-29-2005, 05:53 PM

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 09:16 PM.