Help identify FOV diagram software

[va1erian]

Hi there,

I saw a website where you could key in the magnification of your eyepiece and its numerical AFOV, and it would show you the FOV as a circle on a certain piece of map. This would help me to visualise the real FOV of the eyepieces before I buy it. But I forgot which website it was. An example of the FOV diagram output (or similar) is shown below. Please help me to identify it.

http://www.firstlightoptics.com/prod.../fov_32_40.jpg

http://www.firstlightoptics.com/prod.../fov_32_40.jpg

[peter_4059 (Peter)]

I'm aware of this one:
http://www.newastro.com/book_new/camera_app.html

Astroplanner also has this functionality

http://www.astroplanner.net/

[julianh72 (Julian)]

SkySafari app (available on iOS and Android) will do this.

[mithrandir (Andrew)]

Stellarium does it too.

[mswhin63 (Malcolm)]

CdC does too

[va1erian]

Thanks everyone for replies. Most of the mentioned software (e.g. newastro) look at how an image is compared with the size of the CCD camera sensor.

This is not what I am looking for. In other words, the said software draws a rectangular on the night sky image, instead of a circle (which would be the case when using an eyepiece).

What's more, the said software does not allow to overlay the circles representing eyepieces of different focal lengths and of different AFOVs. Thus, I cannot compare different eyepieces.

I did more search, and found that the right keywords are "telescope FOV simulator". That's "simulator", not "calculator".

Following this search, I discovered the website which is closest to what I want, i.e. it allows to key in the focal length and aperture of the telescope and of EP, and voi la ! -- the appropriately sized map of the sky appears. But it is still does not do what I need -- it does not allow to compare several eyepieces.

This is the website, http://www.12dstring.me.uk/fovcalc.php



EDIT. Aha, I finally found it !!!!

http://astronomy.tools/calculators/field_of_view/

[mswhin63 (Malcolm)]

CdC has two FOV features, I too use the rectangular FOV, which has a calculation method based on the camera and the FL and aperture. I get very accurate representation of what my camera sees and I use it to guide the scope to it location too.

[OzEclipse (Joe Cali)]

Starry Night Pro allows multiple FOV's even from different instruments to be overlaid on an object.

When you first set up SNP, you enter the specs of your various OTA's, camera lenses, eyepieces and camera sensors. Then the FOV of any combination of eyepiece or camera and optic can be overlaid on any part of the sky in any orientation.

[julianh72 (Julian)]

Originally Posted by va1erian

Thanks everyone for replies. Most of the mentioned software (e.g. newastro) look at how an image is compared with the size of the CCD camera sensor.

This is not what I am looking for. In other words, the said software draws a rectangular on the night sky image, instead of a circle (which would be the case when using an eyepiece).

What's more, the said software does not allow to overlay the circles representing eyepieces of different focal lengths and of different AFOVs. Thus, I cannot compare different eyepieces.

It sounds like you found what you are looking for, but just to clarify, apps like SkySafari (and others) can simultaneously display up to 5 user customisable windows, such as camera sensors or eyepieces on your choice of OTA, binoculars, etc. E. G. Check out the attached screenshot.

[vlazg (George)]

Try Stellarium, it will do it and its free