Results 1 to 7 of 7
Like Tree1Likes
  • 1 Post By KathyNS

Thread: How much zoom is good zoom?

  1. #1
    Conannet's Avatar
    Conannet is offline Main Sequence
    Points: 3,591, Level: 39
    Level completed: 61%, Points required for next Level: 59
    Overall activity: 0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!50 Posts Achievement!First 1000 Experience Points
    Join Date
    Jan 2015
    Location
    Pazardjik, Bulgaria
    Posts
    88
    Points
    3,591
    Level
    39
    Thanks
    4
    Thanked 3x 3 Posts

    Default How much zoom is good zoom?



    Hi guys.

    I know that not always the biggest magnification is the best, but I just can't get a view of any planet. I have a very small telescope (50mm) refractor with 600mm focal length. When I got it, it was with an 10mm eyepiece (the others were lost in action), but today I swapped it with 4mm eyepiece. That should give me 150x zoom right? With the first eyepiece (10mm) I could spy on the neighbors and anything, but couldn't see that much in the night sky... And since it has very small diameter, it's waste of time to try to search for something, that can't be seen with naked eye. When I was looking at Jupiter, it looked just like a blob of light the size of rice. So I put on the new eyepiece, and I was expecting much better views, but it made almost no difference. When I was looking at landscape, sure the difference was huge, but when I looked at Venus and Jupiter, the difference was very small. So Jupiter is still just a blob of light, but this time just a little bit bigger haha. So how much magnification (if thats the problem) should I have to get some details on Jupiter?

    Thanks for reading.

  2. #2
    KathyNS's Avatar
    KathyNS is offline Super Moderator
    Points: 173,250, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 40.0%
    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
    25,181
    Points
    173,250
    Level
    100
    Thanks
    6,660
    Thanked 14,988x 9,544 Posts
    Blog Entries
    3

    Default Re: How much zoom is good zoom?

    With a 50mm scope, the maximum magnification you can reasonably use is 50x. A 10mm eyepiece is already a bit too much for your scope, and the 4mm eyepiece will never give you satisfactory results under even the best atmospheric conditions.

    By the way, the term "zoom" only applies to variable focal length eyepieces. Yours are fixed focal length eyepieces, so no zoom.
    Pitter likes this.

    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
    Conannet's Avatar
    Conannet is offline Main Sequence
    Points: 3,591, Level: 39
    Level completed: 61%, Points required for next Level: 59
    Overall activity: 0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!50 Posts Achievement!First 1000 Experience Points
    Join Date
    Jan 2015
    Location
    Pazardjik, Bulgaria
    Posts
    88
    Points
    3,591
    Level
    39
    Thanks
    4
    Thanked 3x 3 Posts

    Default Re: How much zoom is good zoom?

    Actually not. They are variable, but I was talking at the highest power. On the side of the telescope, it said 35-50x zoom with the original one. The next one is also variable (I measured about 4mm at the highest power), but obviously it's pointless to put it on. Thanks for your reply!

  4. #4
    KathyNS's Avatar
    KathyNS is offline Super Moderator
    Points: 173,250, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 40.0%
    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
    25,181
    Points
    173,250
    Level
    100
    Thanks
    6,660
    Thanked 14,988x 9,544 Posts
    Blog Entries
    3

    Default Re: How much zoom is good zoom?

    Oh, okay. It wasn't clear that they were actually zoom eyepieces. So one is 12mm - 17mm (35x - 50x). How did you measure the 4mm? Focal length of an eyepiece is difficult to measure. Does it have any markings on it to identify it? It would be good to know exactly what you are dealing with.

    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.

  5. #5
    Conannet's Avatar
    Conannet is offline Main Sequence
    Points: 3,591, Level: 39
    Level completed: 61%, Points required for next Level: 59
    Overall activity: 0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!50 Posts Achievement!First 1000 Experience Points
    Join Date
    Jan 2015
    Location
    Pazardjik, Bulgaria
    Posts
    88
    Points
    3,591
    Level
    39
    Thanks
    4
    Thanked 3x 3 Posts

    Default Re: How much zoom is good zoom?

    Well I tried to measure how far does it focus the light, but this is usually totally inaccurate... Well pretty much I did it too see if it has smaller focal length than the original one, and yes it was focusing much closer than the original one. On the telescope, it cloud magnify much more than the 12-17 one, so even if it's not exactly 4mm, it's somewhere in between 12 and 4.

  6. #6
    DeanD's Avatar
    DeanD is online now HYPER GIANT
    Points: 16,692, Level: 89
    Level completed: 27%, Points required for next Level: 258
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!50 Posts Achievement!750 Days+ Registered Achievement!
    Join Date
    Apr 2012
    Location
    South Australia
    Posts
    2,375
    Points
    16,692
    Level
    89
    Thanks
    280
    Thanked 734x 598 Posts

    Default Re: How much zoom is good zoom?

    Even at 35-50x you should be able to see the lines of the two main cloud bands on Jupiter, and the 4 Galilean moons. If you can't see any detail at all at those powers then there is no point trying for higher power.
    Realistically, as Keith says, you wouldn't be able to go much higher that 50x unless you have a very good objective lens. Unfortunately, most 50mm scopes don't fall into that category, so if you want to see detail on planets you would be best advised to save up for something a bit better.

    All the best,

    Dean

    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.
    :
    12" home-made dob, Celestron 150 f5, Tak TSA102, TV 76, Celestron 800CPC, ETX 125
    Mounts:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    MiniTower, HEQ5Pro
    Binos: 25x100FB, Carton 11x80, Vanguard Endeavour 1045, Takahashi 22x60, Swarovski Habicht 8x30
    Eyepieces: My favourites are my Televue 32mm plossl, Nagler 13mm T6, Nagler 3-6mm

  7. #7
    Conannet's Avatar
    Conannet is offline Main Sequence
    Points: 3,591, Level: 39
    Level completed: 61%, Points required for next Level: 59
    Overall activity: 0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!50 Posts Achievement!First 1000 Experience Points
    Join Date
    Jan 2015
    Location
    Pazardjik, Bulgaria
    Posts
    88
    Points
    3,591
    Level
    39
    Thanks
    4
    Thanked 3x 3 Posts

    Default Re: How much zoom is good zoom?

    Thanks for your help. And yes... that's what I'm saving money for right now. So I guess viewing landscape and viewing night sky objects has absolutely nothing in common, because at viewing landscape it does pretty good job, but with it I can't even see the Galilean moons, which I managed to photograph only using a small cheap camera and nothing more.

 

 

Similar Threads

  1. To Zoom or not to Zoom, that is the question.
    By TILLIBOBS in forum Telescope Eyepieces Forum
    Replies: 37
    Last Post: 08-13-2013, 09:01 PM
  2. Replies: 4
    Last Post: 03-29-2007, 08:36 PM
  3. Zoom astro telescope with good optics
    By James Harris in forum Amateur Astronomy Forum
    Replies: 3
    Last Post: 12-13-2006, 10:54 PM
  4. Zoom astro telescope with good optics
    By James Harris in forum UK Astronomy Forum
    Replies: 1
    Last Post: 12-13-2006, 08:31 PM
  5. Zoom out, Zoom in, animated video
    By Matt in forum General Astronomy Forum
    Replies: 3
    Last Post: 08-13-2003, 04:14 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 10:55 AM.