what is the widest field of view possible with scope/ep combination?

[tenbyfifty]

just wondered if a short wide aperture scope with the right ep can give u the same view as the biggest (affordable) binoculars ie 25x100s?

[michael.h.f.wilkinson]

A scope can often go wider, because it can use 2" EPs more easily. I use my 80mm  F/6 with 31T5 Nagler at 5.3 deg true FOV. With the 42mm I can get to 5.7 deg or so. More than my 15x70mm bins. A 100mm F/5 scope could get about the same FOV out of those EPs.

[Laurie61]

My 100 mm f6 Bino's can give a 2.5 dg field of view, a 100 mm f6 refractor with 2" eyepiece (42 mm) could give 3.6 dg field. This site lets you simulate different scope/eyepiece combinations. http://www.nightskies.net/scopetest/scopecalc/index.html 

[Alien 13]

I just ran my scope through the calculator (thanks Laurie) and got this with the WO 40mm eyepiece.

Focal Length:  420mm  
Magnification: 10x
True Field of View: 6.7°   (Orion's Belt could easily fit into the field of view)
Exit Pupil: 6.8 mm
Theoretical Resolving Power: 1.63 arcseconds
Approximate Limiting Magnitude of Telescope: +10.2 (under dark, moonless skies)

Must get one

Alan

[Davey-T]

A scope can often go wider, because it can use 2" EPs more easily. I use my 80mm  F/6 with 31T5 Nagler at 5.3 deg true FOV. With the 42mm I can get to 5.7 deg or so. More than my 15x70mm bins. A 100mm F/5 scope could get about the same FOV out of those EPs.

Wot he said.

Dave

[clarkpm4242]

Something to consider is the exit pupil, especially as you get a bit older   

https://www.astronomics.com/eyepiece-exit-pupils_t.aspx

I have a TMB 92mm f5.5 APO and 31mm Nagler combo that gives 5 degrees FOV and a reasonable exit pupil.

Cheers

Paul

[John]

My widest combo is a Vixen ED102 F/6.5 and the 31mm Nagler which gives me 3.83 true degrees at 21.4x and an exit pupil of 4.77mm.

[RikM]

My Pronto and ES28/68 gives me 16x, 4.23* true field and 4.36mm exit pupil.

[tenbyfifty]

so that's a yes then, thanks for replies