50mm or 56mm ?

Discussion in 'Long Range Scopes and Other Optics' started by trader388, Sep 9, 2004.

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  1. trader388

    trader388 Well-Known Member

    Feb 12, 2004
    Thought this would be an interesting discussion.

    Looking at Nightforce 3.5-15 and 5.5-22 ...both come in 50mm and 56mm objectives. Which is better and why?
  2. sakofan

    sakofan Well-Known Member

    Apr 17, 2003
    50mm. Less is more in objective size..sakofan...44mm, even better.

    Coatings/glass have leveled the playing field, IMHO. Big objective scopes are obsolete.
  3. LB

    LB Well-Known Member

    Jul 22, 2004
    Oh, maybe not? I'm not throwing mine away, just yet. You still pay a premium for the 56MM objective, and perhaps the deciding factor is the tube size, one inch or 30mm? Another factor is your mission. Top quality optics should allow for almost any situation, during legal hunting hours, without the need of 50 or 56mm objective lenses. Hunting after dark is where the large objectives and 30mm main tubes excell, other than that, they may be too bulky and too expensive? Decide what you want to do and buy accordingly.

    Good hunting. LB

    edit: high magnification requires more light gathering, also, kind of like an f-stop on a camera.

    [ 09-09-2004: Message edited by: LB ]
  4. preacherman

    preacherman Well-Known Member

    May 10, 2004
    ...several things to consider... 56mm would obviously gather more light than the 50mm, with all other things being equal... must consider how important low light performance is vs the extra weight and height of the objective lens... have never felt deprived by 50mm lenses, in fact, prefer 44mm or thereabouts for most live hunting applications... also smaller obj lense puts the scope closer to bore, but I gotta admit, just one look through a large objective and it's really bright... ultimately it depends on the type of rifle it will be mounted on and your own personal preferences... I just love'em all!
  5. 700

    700 Well-Known Member

    Jun 30, 2002
  6. Pete Lincoln

    Pete Lincoln Well-Known Member

    Mar 17, 2004
    No Need for a 56mm Obj for most applications, a human eye won't notice the difference between a 50mm and a 56mm. I'd go for the 50mm. Optical quality is the issue, you'd be better of with quality x42mm Obj than a crappy 56mm. NXS seem pretty good, you'd be better of with the 50mm.
  7. Varmint Hunter

    Varmint Hunter Well-Known Member

    Dec 26, 2001
    In theory, with either scope, the 56mm will allow maximum light to reach your eye @ 9.3X, and the 50mm will provide the same amount of light when set on 8.3X.

    Under dark conditions when you really need the maximum amount of light (6mm exit pupil) do you NEED more than the 8.3X that the 50mm scope provides? Probably not.

    I'll go with the guys who recommend the 44mm objective scopes. They are smaller, lighter, less expensive and provide maximun light when set @ 7.3X. That is MORE magnification than I almost ever use in the field while hunting biggame.

  8. brian b

    brian b Well-Known Member

    Aug 15, 2004
    Your origional question "what is better a50mm
    obj.or a 56mm obj." my question is what are
    you using it for ??? If I was packing it on
    a light carry gun I would take the 50mm or
    smaller (40mm),if it was on my 24lb. 1000yard
    gun that I dont pack around give me the 56mm
    or bigger (80mm).Quality of glass is an issue
    also, on the Nightforce there might not be
    that big of a difference between the two
    because they use quality glass and it is only
    6mm diference.if you take El Chinero quality
    of glass it is junk if it is 40mm or 80mm.
    You can take a Leupold 6.5x20 40mm and put
    it next to a Leupold 6.5x20 50mmLR with the
    30mm tube,in mid-day light you dont notice
    that much difference but at dawn or dusk at
    20 power absolutely no comparison the 50mm is
    better it just all depend's on what your
    need's are