Results 1 to 3 of 3
  1. #1
    Astroglide2015's Avatar
    Astroglide2015 is offline Main Sequence
    Points: 1,310, Level: 21
    Level completed: 10%, Points required for next Level: 90
    Overall activity: 1.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!365 Days+ Registered Achievement!
    Join Date
    Mar 2018
    Location
    Concord, NC
    Posts
    65
    Points
    1,310
    Level
    21
    Thanks
    45
    Thanked 1 Time in 1 Post

    Default White spot in my Barlow



    Hi,
    I have a SVBONY 5x barlow camera adapter on my Sony A6000. Usually I'm looking at something at night and trying to take some pictures. I did notice sometimes there's a bright area in the center of the image when I live view it. Didn't think too much about it until today, I installed a 6.3 focal reducer on my scope and looked out the window at some bricks in a pile about 100 yards away. I was looking at roughly how smaller they were through the reducer and then I got my barlow and my 25 mm eyepiece and looked at the bricks. Then I attached the barlow to my camera to see how they looked, there was a bright white spot in the center of the image! Was it because of light reflecting inside the shiny black inside of the barlow? That made sense to me but what can I do about it? Oh, I don't intend to use the 5x barlow while I'm using the focal reducer but the photo was taken with the reducer off.

    Thanks,
    Dano

    DSC06875.JPG
    Attached Images Attached Images

  2. #2
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 78,567, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 88.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Join Date
    Jan 2016
    Location
    Live: Slovakia Work: Canada
    Posts
    18,225
    Points
    78,567
    Level
    100
    Thanks
    3,423
    Thanked 5,738x 4,813 Posts
    Blog Entries
    4

    Default Re: White spot in my Barlow

    Usually poor lens edge blackening/ baffling will cause edge of field brightening (EOFB).
    Look into the lens and see if you can see anything shiny towards the camera it may be causing a internal reflection.
    If it was from a outside source it would normally cause a stray reflection in the source direction.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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

    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

  3. The Following User Says Thank You to Gabby76 For This Useful Post:

    Astroglide2015 (05-01-2018)

  4. #3
    Astroglide2015's Avatar
    Astroglide2015 is offline Main Sequence
    Points: 1,310, Level: 21
    Level completed: 10%, Points required for next Level: 90
    Overall activity: 1.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!365 Days+ Registered Achievement!
    Join Date
    Mar 2018
    Location
    Concord, NC
    Posts
    65
    Points
    1,310
    Level
    21
    Thanks
    45
    Thanked 1 Time in 1 Post

    Default Re: White spot in my Barlow

    If I deliberately out of focus no matter which way I point the lens the white spot is much more and it's centered. I'll check out what you said.

    Thanks again,
    Dano

 

 

Similar Threads

  1. Ha Sun and White Light Spot
    By Purdyd in forum Solar Viewing Forum
    Replies: 1
    Last Post: 05-25-2016, 12:16 PM
  2. Jupiter white spot on NEB and a short GIF-t.
    By astroado in forum Astrophotography Forum
    Replies: 15
    Last Post: 02-26-2016, 03:42 PM
  3. White spot in Saturn STrZ
    By Ian Sharp in forum UK Astronomy Forum
    Replies: 4
    Last Post: 02-11-2006, 07:56 PM
  4. White Spot in Saturn's SPR
    By Ian Sharp in forum UK Astronomy Forum
    Replies: 2
    Last Post: 12-23-2005, 12:25 PM
  5. The Great Red Spot is white?!
    By Drew in forum Amateur Astronomy Forum
    Replies: 22
    Last Post: 04-01-2005, 05:33 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 04:56 AM.