"Field of view" questions (1 Viewer)

spiralcoil · Sep 1, 2010

Would find any appreciable differences in practical application between those below binoculars with different "field of view" figures:

1. 8x32 HD's 135m/1000m vs 8x32 EL's 140m/1000m (and the 8x32 FL's 140m/1000m)?

2. 8x32 HD's 135/1000m vs 8x42 HD's 130m/1000m?

3. 10x32 HD's 118m/1000 (or the 10x32 EL's 120m/1000m) vs 10x42 HD's 112m/1000m (or the 10x42 EL's)?

ceasar · Sep 1, 2010

As a practical matter there isn't much difference, at least within the same formats. 5 yards difference at 1000 yards = 15 feet. At 100 yards it is 18 inches. At 100 feet there will be a 6 inch wider FOV. (Hope my math is right here!):scribe: At 100 yards, I can readily see a difference in the FOV between my Nikon 10 x 35 EII @7 degrees and my Nikon 10 x 42 SE @ 6 degrees. That works out to a little more than a 5' difference as far as I can tell.
Bob

brocknroller · Sep 9, 2010

ceasar said:
As a practical matter there isn't much difference, at least within the same formats. 5 yards difference at 1000 yards = 15 feet. At 100 yards it is 18 inches. At 100 feet there will be a 6 inch wider FOV. (Hope my math is right here!):scribe: At 100 yards, I can readily see a difference in the FOV between my Nikon 10 x 35 EII @7 degrees and my Nikon 10 x 42 SE @ 6 degrees. That works out to a little more than a 5' difference as far as I can tell.
Bob

I see a big difference between those two bins too. Seems even more than a degree because the eyecups on the SE prevent me from seeing the entire FOV (I have to tilt the bins to see the field stop).

I think what needs to be discussed is Apparent Field of View (AFOV).

A 7x50 bin with 7* TFOV gives a stingy 49* AFOV, which to me, looks tunnelesque.

But the 10x35 with a 7* TFOV yields a spacious 70* AFOV that lets your eyes can wander around. Looking at the night sky with the 10x35 EII is the closest I probably ever be to taking a "space walk".

I always consider the AFOV when purchasing a bin, because I don't like claustrophobic views. My rule of thumb is that I prefer a 60* AFOV or more regardless of the configuration. I can go down to 57* and still feel okay, but at 50*, I start screaming, "Let me out, let me out of this closet!"

Brock

spyglass · Sep 9, 2010

CADET ROLLER!! Eyes forward! Don't let me see you gawkin' around and lettin' them eyes wander again! UNDERSTOOD!? Now drop and gimme twenny!

brocknroller · Sep 9, 2010

spyglass said:
CADET ROLLER!! Eyes forward! Don't let me see you gawkin' around and lettin' them eyes wander again! UNDERSTOOD!? Now drop and gimme twenny!

Drill Sgt. Spyglass: Candidate Mayo's strutting in the dirt; Look at his face, he's starting to hurt; Here he is, thinking he's a great big star; But before too long he's gonna D.O.R.; Seen guys like you a hundred times; I'm telling you, Mayo, I'm one of a kind; Gonna give you more than you can take; I'm gonna watch you crumble and watch you break!

Candidate Mayo: Don't you do it! Don't! You... I got nowhere else to go! I got nowhere else to g... I got nothin' else.

Paskman · Sep 10, 2010

brocknroller said:
I see a big difference between those two bins too. Seems even more than a degree because the eyecups on the SE prevent me from seeing the entire FOV (I have to tilt the bins to see the field stop).

I think what needs to be discussed is Apparent Field of View (AFOV).

A 7x50 bin with 7* TFOV gives a stingy 49* AFOV, which to me, looks tunnelesque.

But the 10x35 with a 7* TFOV yields a spacious 70* AFOV that lets your eyes can wander around. Looking at the night sky with the 10x35 EII is the closest I probably ever be to taking a "space walk".

I always consider the AFOV when purchasing a bin, because I don't like claustrophobic views. My rule of thumb is that I prefer a 60* AFOV or more regardless of the configuration. I can go down to 57* and still feel okay, but at 50*, I start screaming, "Let me out, let me out of this closet!"

Brock

Absolutely agree :t:- I wear glasses and getting the a good AFOV can be tricky. This was the reason I fell in love when I realised I could see the total field in the EIIs with my glasses on. It is also the reason I loved the 7x42 SLCs I had - such a shame they get heavier throughout the day!

Paul

Hermann · Sep 16, 2010

brocknroller said:
I always consider the AFOV when purchasing a bin, because I don't like claustrophobic views. My rule of thumb is that I prefer a 60* AFOV or more regardless of the configuration. I can go down to 57* and still feel okay, but at 50*, I start screaming, "Let me out, let me out of this closet!"

Same here. With bins anything below 55* AFOV is too narrow for me, 60* is alright, 65* and more is nice. Anything over 70* is great. That's why I like the old Zeiss Oberkochen 10x50 with its 73* AFOV so much.

I've got a similar rule of thumb for the exit pupil - anything below 4mm is too small. I can go down to 3.75mm, 3.5mm is already marginal, anything smaller doesn't work for me at all. I simply can't use 8x20's for any length of time, and even the Nikon 10x35 EII makes me feel uncomfortable after a while. That's a shame, it's in every other respect one of the nicest 10x bins I know.

Hermann

"Field of view" questions (1 Viewer)

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spiralcoil

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ceasar

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brocknroller

porromaniac

spyglass

Djoo c it? Wut wuzit?

brocknroller

porromaniac

Paskman

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Hermann

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