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The 40-60x bit~

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Old Sunday 11th February 2007, 20:04   #1
Adam C
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The 40-60x bit~

Hi everyone.

Sorry to ask this question again as I think I recall reading about it somewhere in a previous post.

But with a 77mm scope the 20-60x eyepiece is at its best up to 40x I understand. Still good above this but the tunnel effect creeps in etc when viewing at the full 60x.

So does this mean on a 62mm scope does the same thing happen around 40x?

ie the 62mm scopes are good between 16-30 but the same tunnel effect etc happens around 40x?

Hope you can understand what I am getting at. (never great at explaining myself

Any help really appreciated or even a poiter to a prevous post would be great as I am looking at the 62mm versus 77mm Leica APO scope.
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Old Sunday 11th February 2007, 20:30   #2
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There is no extra "tunnel" effect above 40x - in fact on most modern scopes, there is little tunnel effect at all (the Zeiss 85, for example, with Apo zoom is very wide indeed). What you might have read is that above 40x the brightness of the view can diminish but, again, I would say that most modern zooms cope amazingly well (the Nikon up to 75x for example).
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Old Sunday 11th February 2007, 23:12   #3
Adam C
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Ok so if there is any loss of quality (even very very slite) and lets say even in the cheaper scopes, is this mirrored by the smaller scope in the high magnification end as much as with the high end of the big scopes?
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Old Monday 12th February 2007, 08:29   #4
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Quote:
Originally Posted by Adam C
Ok so if there is any loss of quality (even very very slite) and lets say even in the cheaper scopes, is this mirrored by the smaller scope in the high magnification end as much as with the high end of the big scopes?
My experience of smaller scopes is limited to the Nikon ED50 and that scope certainly maintains its quality right through to maximum zoom magnification with only a slight reduction in brightness. There is a thread here on an Aldi scope which suggests that on less expensive scopes the image does darken and soften slightly at maximum zoom.
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Old Monday 12th February 2007, 11:43   #5
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Steve

I think I mentioned this in another thread but ......

at 20x
the swaro has a FOV of 2.06
the Nikon has a FOV of 2.00
the Leica has a FOV of 1.9

at 60x
the swaro has a FOV of 1.14
the Nikon has a FOV of 0.96
the Leica has a FOV of 1.1

so actually the Leica zoom narrows considerably LESS than the others! Hence when people say the Nikon has a tunnel like view they mean at 60x!

Personally I'd prefer it the other way round!

I've ignored the zeiss because they have increased the view at the cost of a less than 100% sharp image at the edge. For Adam's benefit this irritates the hell out of some and sends others into raptures.

So to answer the question yes the Leica narrows but not that much and no worse than any other zoom. As 16-48 the Leica zoom will be less narrow than a 20-60 all the way through.
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