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same magnification but different

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/11/2012 at 01:12
sswf224 View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: July/11/2012
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Hi all.

I have a question (or two).

I have two sets of Binoculars - both 12 x 25 - but one is much better than the other - I think one is a cheapy and the other a good make.

Also what would be a good magnification for watching sport (ie F1)

Many thanks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/11/2012 at 08:47
RifleDude View Drop Down
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Welcome to OT!

I personally would not go above 10X on handheld binoculars because any detail gained from the higher mag is at least somewhat offset by the fact I can't hold the binoculars steady enough to utilize the increased detail.  In addition, the higher you go up in magnification, the narrower your field of view will be and the shallower your depth of field (min and max distance objects remain in focus) will be.  A 12X25 binocular is a very compromised design.  25mm is an exceedingly small objective for 12X magnification.  Consequently, you will have low resolution and poor light transmission from only a 2.08mm exit pupil.  That's the other problem with high magnification -- you then need a larger objective lens diameter to fully utilize the benefits of the increased magnification.  That then means a larger heavier optic. 

I personally prefer 8X.  To me, it strikes the best balance between enough magnification for good long distance detail, generous field of view and depth of field, so I can acquire objects of interest quickly, and good light transmission without having to go with a gargantuan objective.  Yet, I can also hold even small 8X binos steady enough that high magnification image shake doesn't hinder my ability to see great detail. 

For what you're doing -- viewing sporting events in good light conditions -- I would get a good midsized (8X32 class) 8X roof prism bino.  If you feel you need more magnification, 10X is fine too, but if you go with 10X, I'd get a full size (10X42 class) bino instead.  Some prefer 10X over 8X as "all-around" binos, and both have their strengths.  Personally, I don't think 10X gives me enough extra detail sufficient to offset the loss of FOV, DOF, and exit pupil size.

Let us know what your budget is, and we can make more specific recommendations.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/11/2012 at 09:38
sswf224 View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: July/11/2012
Location: Rugby, Midlands
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Points: 3
Thank you for your very detailed reply.
As for my budget - not sure - around £100.00 'ish
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/11/2012 at 14:00
Bird Watcher View Drop Down
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Originally posted by sswf224 sswf224 wrote:

Also what would be a good magnification for watching sport (ie F1)


Here's a very nice W I D E  FOV:

http://swfa.com/Nikon-7x35-Action-Extreme-ATB-Binocular-P42214.aspx
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