Individual eye focus binos

Discussion in 'Long Range Scopes and Other Optics' started by M_freeman, Sep 1, 2011.

  1. M_freeman

    M_freeman Well-Known Member

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    I have never used them, are individual eye focus binos easier to use? Do you set them once, or are you constantly refocusing 2 seperate focus knobs all day? I have looked at some of the scientific reviews and some of the porro prism with individual eye focus had pristine results. ​
     
  2. Browninglover1

    Browninglover1 Well-Known Member

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    The only pair I ever used were very simple to get set up. You simply focus each eyepiece on the same distant object and you're set. After that point you can view anything you want from 20 or 30 yards to infinity.

    I found it necessary to do a few little adjustments to the focus, once both eyes were open, to avoid getting headaches having to do with my eye dominance. Once I got it set how I wanted it (took about 2 minutes) I used them the rest of the weekend and absolutely loved them.

    The only downfall I see to them is if you lend someone your binoculars they are going to try and adjust them so they can see and it will mean you have to refocus them.
     

  3. M_freeman

    M_freeman Well-Known Member

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    ^^^^ yes that is what I thought, this would ideal for hunting, as now I am spinning that focus wheel all day long. The Fujinon and Steiner individual eye focus porros have incredible results from light transmission test and have been rated at the top of the list. I think I'll try a pair. Thanks for the info.
     
  4. Loner

    Loner Well-Known Member

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    Why would you focus both eyepieces? On mine I close my rt eye and adjust the main
    knob to focus my left eye on a target, then I close my left eye and adjust the right
    diopter into focus on the same object. Both are now in focus as said below.
     
  5. M_freeman

    M_freeman Well-Known Member

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    I understand, and they are set permanently no more focusing unlike binos with central focus. Sounds like a much nicer way to go than with central focus.
     
  6. Browninglover1

    Browninglover1 Well-Known Member

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    In all honesty if you adjust a center focus pair of binoculars like Loner mentioned to do you should have the same results. I've found that the cheaper the binocular and the more high powered a binocular gets the smaller their optimum focus range is. On cheap binoculars I find myself refocusing the image all the time but on my Cabela's Euros I'm good from about 30 yards to infinity. I had a pair of Vortex Kaibabs (I miss them so much!) that I could set from about 50 yards to infinity but with the higher magnification I found I could do slight focusing adjustments to get a clearer picture in certain lighting conditions.

    I think you will be happy with whatever route you go, just don't buy the individual eye focus binoculars thinking they are the only kind that have a large optimum focus zone.
     
  7. Loner

    Loner Well-Known Member

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    I still use the center focus all the time. It's just the diopter adjustment on the rt
    side adjusts them for my eye differences, at whatever range I focus on. But like
    has been said you set it once or until someone else screws with it.
     
  8. Bravo 4

    Bravo 4 Well-Known Member

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    We have the M19, M22 and the compact M24 binos. The only thing I like about them is the mil-reticle. And on some of the models the stadia lines aren't to any real standard length wise. So you have to check them.
    I can't stand them because you have to focus both lenses separately. If you get them focused on one object and try to leave the focus alone your eyes seem to have to focus on objects at different ranges. This gives me eye fatigue and a headache pretty darn quick. That or you do have to keep adjusting the eye pieces separately at different ranges. Not something I wanna use for glassing for an extended period of time. I have a pair of not so expensive Zeiss that are fast focus and use them in the field instead, and they beat the pants off probably anything labeled Leupold, Burris, Bushnell or Nikon.
     
  9. SBruce

    SBruce Well-Known Member

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    I've used the IF Binoculars for probably nearly 20 years now. Absolutely love them!!

    Leupold used to make them. My old Leupys are 10X40's. I bought some Steiners after that (10X50 NightHunters) and have used them too. I still have and use both and will never lend them out or sell them. A good friend has another version of the Steiners with IF and he is really happy with them too.

    Once each eyepiece is set for your eyes.....you never have to focus them or turn a knob/diopter ever again (unless your eyes change). From 20 yds to Infinity, they are good to go!

    Only thing is, when you do the original focusing, do it on something very distinct with shart edges and contrast, and do it at beyond 100 yds. Also, as previously stated, fine tune with both eyes open. Once that's done, leave them alone and enjoy them.

    I can look through mine for hours and hours straight and never get any eye strain or headaches, I can honestly say they are pure pleasure to use.

    I also have some regular binos and I do get eye strain with them. I always have to re-focus the center wheel for distance and everytime I do that, it seems the diopter needs changed one way or the other some too. My regular focus ones are also Leupold and Steiner. I've even looked through some swarovski bino and still felt that something wasn't quite right with the normal focus/diopter. Maybe it's just my eyes, but give me IF anyday!:)

    For me, these IF binos are like Jewel triggers, once I tried them I'll never go back. I don't know why Leupold ever quit making the ones they did, but at least Steiner is making them. Get em while you can and if you like em as well as I have, don't get rid of them, ever!! I'd give up one of my $6000 custom rifles before I'd give up either of my IF binoculars!
     
    Last edited: Sep 4, 2011
  10. Bravo 4

    Bravo 4 Well-Known Member

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    Bruce,
    That's a pretty hardcore post in favor of. You have me rethinking my stand with them. I have a pair of my own Fuji M24's sitting right here in front of me that I'ma go give another chance. Maybe my eyes have a hard time with the reticle in them. I'm not sure about all Steiners, but does yours have a reticle?
     
  11. WyoElk2Hunt

    WyoElk2Hunt Well-Known Member

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    For me, these IF binos are like Jewel triggers, once I tried them I'll never go back. I don't know why Leupold ever quit making the ones they did, but at least Steiner is making them. Get em while you can and if you like em as well as I have, don't get rid of them, ever!! I'd give up one of my $6000 custom rifles before I'd give up either of my IF binoculars!

    I agree with SBruce mine are Leupold and I love them. Never have to re focus from one view to the next.
     
  12. SBruce

    SBruce Well-Known Member

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    Yea, I feel real strongly about the IF's. I still mostly use the Leupolds, but the Steiners are better in really low light. Main reason I bought the Steiners was because Leupold quit making the IF's and I wanted a backup, just in case I ever broke or lost the Leupolds.

    I have no knowledge about the Fuji brand. I've never heard of them before.?
    What's the price range? The Steiners I've got were about $950 in 2003.

    No, I don't have any reticle in either of my IF Binos. I believe Steiner did make some military/marine models with a reticle though.

    I once tried some "no focus" binos, there was nothing to focus anywhere. They were a cheap brand and I quickly tossed those. Headaches from Hell!!
    The eyes have to do all the work with those.
     
  13. LouBoyd

    LouBoyd Well-Known Member

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    "No focus" binoculars work ok for young guys who don't need corrective lenses at relatively long distances. Yes they are fixed focus, nothing tricky and rely totally on your eye's ability to handle the focus. You can accomplish the same thing if you focus your IF or CF binoculars for the range you use them most (say 600 yards) then train yourself NOT to refocus when you look at things at other distances. Do your really need to count the flies on the butt of that doe at 50 yards? The amount of focus movement is proportional to the the difference of the reciprocals of the distance. For example Focusing from 50 to 100 yards take the same adjustment movement as focusing from 100 yards to infinity. Just avoid using binoculars at short range. If you're into bird watching or studying insects plan on focusing a lot.

    Keep in mind that low F ratio binoculars have a shallower depth of field than high F ratio ones. For example, 7x50 binoculars will need more focusing for sharp images than 7x25's will. Sure the images on the 7x50 will allow you to see better in twilight but not the rest of the time. the 7x25s are about 1/3 the weight making them much more pleasant to carry. My favorite carry binoculars are 10x35s. I own 7x50 and 20x70's but I rarely carry them outside of my dooryard.

    As far as sharing binoculars, don't. Better to give your shooting partners a decent pair for Christmas than to let them screw up your settings. When they hand the binoculars back is when you'll need them set correctly the most. Murphy's law guarantees that. That's equally true for riflescopes, spotting scopes, and night vision scopes.
     
    Last edited: Sep 5, 2011
  14. Bravo 4

    Bravo 4 Well-Known Member

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    The IF I have are not high dollar. About as much as Nikon Monarch. They have decent glass in them. I believe it may be the mil ranging reticle throws me off some. I messed with them for a bit today and it makes me feel cross eyed after a while compared to my fast focus. As do all our issued binos.