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How do they get that sweet spot?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2007 at 13:17
windstrings View Drop Down
Optics Apprentice
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I have a swarovski EL 8.5 X 42.
One of the reasons I chose it was it seems the clarity branched out towards the edge of the viewing range "farther" than any of the other high end binocs I tried. It also maintained amazing clarity in the center.

It amazes me that they can make a focal point so large... I'm not sure how they do it.. I've always thought of a focal point as being very tiny as when playing with a magnifying glass in the sun etc, but somehow they have managed to spread the range out to a larger field.

Is it more expensive to pull that off and does it cost the manufacture more to make such a lens as compared to one that has a tinier focal point?

Now that I've said that..... what are the limitations and how hard is it to do?

It must not be easy or the cheap ones would have it too.

One thing I noticed is that when I look with my swarovski at a 2 dimensional background such as a wall or any situation where "everything" in the field is all the same distance, I notice the edges are not near as crisp and perfect as the large sweet spot in the center.....
However, When I'm in the woods or in most real life situations, the areas to the edge of my field is rarely the same distance as my center target, but rather closer.... ie: tree branches, trees, brush etc... meaning the areas off to my periphery is usually closer....

In those situations.. I get what seems to be perfect clarity all the way to the edges?

Is it "manufactured" that way on purpose to have the "edge" clarity at a closer range?

Then that brings me to another point... some say the Zeiss lenses are the sharpest, yet their "sweet spot" is smaller than the swarovski's. Meaning anything that not in that "sweet spot" is not real clear.
I"m not sure I agree with that statement about Zeiss being the sharpest since I prefer the feeling of clarity in my whole viewing field rather than one pinpoint in the center.

But nevertheless, I'm wondering if Zeiss could in fact be sharper in the very center at the expense of sharpness in the periphery, or is it manufacturer preference as to which way to build their lenses since we can't have our cake and eat it too and have perfect sharpness throughout the whole viewing field?

I know this post may stir up a hornets nest between Zeiss lovers and Swarovski, but I'm just trying to understand more about different manufacture preferences verses limitations present to all...

I once was under the impression they are all trying to achieve the same goal, but now I think thats wrong... some prefer certain chromatic differences while others focus more on clarity etc.. as as the money goes up.. you try to get it all advantages in one package but even then there are still options, preferences and tradeoffs.. and obviously you have to decide.

Can anyone elaborate if any of this makes sense?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2007 at 15:54
SAKO75 View Drop Down
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my 7x42 SLCneu's were better than the ultravid 7x42 or Ultravid 8x42 or zeiss FL 8x42 in the "SWEET SPOT" area, in fact they were as good or better in every area except weight, they is heavy


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2007 at 16:22
windstrings View Drop Down
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Thats the way I felt too when I spent hours at the bino desk trying them all out. Some swear by the Zeiss, but the ones I tried I was disappointed in.... all my life I wanted a Zeiss because that was my dream and I could never afford it... but when I actually went to buy one, I got all befuddled.

I too had the SLC neu but went with the EL for size, weight and feel..... I really couldn't see any difference in the lenses.

When we look around with our natural eye, everything we look at is in focus and clear.. the more a bino can be that way.. the less eye fatigue we will have so our eye is not constantly trying to "refocus" the out of focus or "NON-clear" things we look at.

I don't know about you, but when I look through my binos.. I don't want to have to "move" them every time I look over 50 yards from my primary target... I should be able to keep them still and pan a field with my eyeballs and cover the FOV of the binos...etc.....

But enough of that.. I was just wondering if certain manufactures make their lenses different on purpose in the area of "sweet spot" or is something thats only contrived through tedious engineering?
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