# Thread: Wide angle and FOV

1. ## Wide angle and FOV

In binoculars, what is the definition of wide angle? For example, the
Orion Scenix 7x50s have a slightly larger FOV than the Scenix 10X50's
which are considered "wide angle".

Bruce

2. ## Wide angle and FOV

Bruce,

In the world of advertising, it's hard to say <g>.

Generally, lower magnifications yield a wider true field. In terms of FOV,
the Scenix 10x50s do have a somewhat wider field than many 10x50s, and I
think that is why they advertise them as "wide angle." Binocular eyepieces
generally provide an apparent field of from 50 to 67 or so degrees, and the
Scenix must have an eyepiece with an apparent field near the higher end. I
think it would be reasonable to think of any binocular with an eyepiece with
an apparent field aroudn 67 degrees as "wide angle."

Clear skies, Alan

3. ## Wide angle and FOV

Look at the table down about half way on this web page... shows FOV
for various binoculars.
http://edu-observatory.org/eo/binoculars.html

4. ## Wide angle and FOV

Ummm..why are you mentioning AFOV when it really means nothing??

The scenix the OP'r talks of are 6 and 7 degrees FOV. Which are astounding.
My bushnell 10X50's have a meager 5.5 deg.

5. ## Wide angle and FOV

Ooops...7 degs for each rather.

6. ## Wide angle and FOV

"Mike L'Mao" <LMAO@telusplanet.com> wrote in
news:QYBXg.11652\$P7.1961@edtnps90:

A greater AFOV allows you to get the same TFOV with a smaller exit pupil.
That's why.

Klazmon.

7. ## Wide angle and FOV

"Mike L'Mao" <LMAO@telusplanet.com> wrote in message
news:QYBXg.11652\$P7.1961@edtnps90...
astounding.

A larger AFOV translates into a wider true field. The true field is
approximately the apparent FOV divided by the magnification. At a given
magnification, a larger AFOV means a larger true field. You aren't going to
have a "wide angle" binocular with an AFOV of 50 degrees.

Clear skies, Alan

8. ## Wide angle and FOV

Fine but I don't think most people know that. You didn't give the relation
between

9. ## Wide angle and FOV

Alan French wrote:

Mike L'Mao responded:

I think most knowledgeable individuals would be satisfied with Alan's
suggestion. It makes far more sense to respond to the original
question in terms of apparent field than in terms of true field.

AFOV = TFOV multiplied by Magnification

where AFOV is 'Apparent Field Of View' and TFOV is 'True FOV'.

By using AFOV, the definition remains the same for *any* (such as:
7x35, 8x42, 9x63, 10x50, 11x80, 20x80, 25x100, 25x150, etc.)
binocular.

Willie R. Meghar
Observational Notes at:
http://meghar.blogspot.com/

10. ## Wide angle and FOV

Pick nits fine enough and you'll be reading 20K of writing just to get
across a simple point.
In other words, don't assume that the OP doesn't know at least some of the
terminology used and if he doesn't happen to know, let him find out rather
than demand it from those who answer. IN other words, if YOU don't know,
first go find out what it means and only ask if you can't find it out.

--
Yeppie, Bush is such an idiot that He usually outwits
everybody else. How dumb!

Page 1 of 2 12 Last