John A Roberts
Well-known member

Hi rpg51 (post #219),
As you indicate, the 10x32’s exit pupil is getting small (at only 3.2 mm dia. > 8 mm sq. area). In terms of what that’s like in use, you may be able to approximate the experience if you have access to an 8x25 (3.1 > 7.6).
Though this does make the point that the EP size is one that we generally associate with specialised and occasional use (rather than general use for extended viewing sessions) i.e. where we accept compromises in optical comfort and performance for convenience of carry.
Particularly with smaller EP’s, a relatively minor increase in diameter produces much more of an increase in area - and among other things, viewing ease - than most seem to appreciate
e.g. comparing the 10x32 to 8x32:
• while the 10x has a 25% increase in magnification,
• the 8x has a 58% larger EP area!
So as you indicate you really do need to try the 10x32 NL for yourself. However, as nzwild cautions, a brief session such as in a shop may be insufficient to get a full appreciation of what use in the field will be like.
- - - -
Some common examples (EP diameter vs EP area):
8x20 and 10x25 (2.5 > 4.9)
10x30 (3 > 7.1)
8x25 (3.1 > 7.6)
10x32 (3.2 > 8)
12x42 (3.5 > 9.6)
8x30 (3.75 > 11) and 15x56 (3.73 > 10.9)
8x32 (4 > 12.6)
10x42 (4.2 > 13.9) and 12x50 (4.17 > 13.7)
10x50 (5 > 19.6)
8x42 (5.25 > 21.6)
7x42 (6 > 28.3)
8x56 (7 > 38.5)
And some EP area comparisons:
8x20 to 8x25, +55% for the 8x25
8x25 to 8x30, +45%
8x25 to 8x32, +66%
8x30 to 8x32, +15%
8x32 to 8x42, +71%
10x25 to 10x30, +45%
10x25 to 10x32, +63%
10x30 to 10x32, +13%
10x32 to 10x42, +74%
10x42 to 10x50, +41%
- - - -
And comparing the 12x NL to the EL:
12x42 to 12x50, +43%
And adding the big SLC to the mix:
12x42 to 15x56, +14%
15x56 to 12x50, +26%
So as always, swings and roundabouts. And the old phrase about there being no optical free lunch also springs to mind.
John
As you indicate, the 10x32’s exit pupil is getting small (at only 3.2 mm dia. > 8 mm sq. area). In terms of what that’s like in use, you may be able to approximate the experience if you have access to an 8x25 (3.1 > 7.6).
Though this does make the point that the EP size is one that we generally associate with specialised and occasional use (rather than general use for extended viewing sessions) i.e. where we accept compromises in optical comfort and performance for convenience of carry.
Particularly with smaller EP’s, a relatively minor increase in diameter produces much more of an increase in area - and among other things, viewing ease - than most seem to appreciate
e.g. comparing the 10x32 to 8x32:
• while the 10x has a 25% increase in magnification,
• the 8x has a 58% larger EP area!
So as you indicate you really do need to try the 10x32 NL for yourself. However, as nzwild cautions, a brief session such as in a shop may be insufficient to get a full appreciation of what use in the field will be like.
- - - -
Some common examples (EP diameter vs EP area):
8x20 and 10x25 (2.5 > 4.9)
10x30 (3 > 7.1)
8x25 (3.1 > 7.6)
10x32 (3.2 > 8)
12x42 (3.5 > 9.6)
8x30 (3.75 > 11) and 15x56 (3.73 > 10.9)
8x32 (4 > 12.6)
10x42 (4.2 > 13.9) and 12x50 (4.17 > 13.7)
10x50 (5 > 19.6)
8x42 (5.25 > 21.6)
7x42 (6 > 28.3)
8x56 (7 > 38.5)
And some EP area comparisons:
8x20 to 8x25, +55% for the 8x25
8x25 to 8x30, +45%
8x25 to 8x32, +66%
8x30 to 8x32, +15%
8x32 to 8x42, +71%
10x25 to 10x30, +45%
10x25 to 10x32, +63%
10x30 to 10x32, +13%
10x32 to 10x42, +74%
10x42 to 10x50, +41%
- - - -
And comparing the 12x NL to the EL:
12x42 to 12x50, +43%
And adding the big SLC to the mix:
12x42 to 15x56, +14%
15x56 to 12x50, +26%
So as always, swings and roundabouts. And the old phrase about there being no optical free lunch also springs to mind.
John