12 inch red dot Artar covering power?

[Peter Schrager]

what is the covering power of the 12 inch red dot Artar?? I have one and want to use it on the 8x10

 

[Dan Fromm]

Goerz says no. But since users' idea of adequate coverage are all over the place, ask it whether it will do for you.

 

[Peter Schrager]

Thanks dan....if it dont cover it dont cover

 

[locutus]

mount it and look at the ground glass?.... Use a loupe to observe how far out its still sharp (Illumination versus Definition).

 

[Ian C]

It appears that the 12” focal length Red-Dot Artar covers 8” x 10” down to 1:5 and higher magnifications. At 1:10 the coverage drops to 7” x 9”.

https://www.pacificrimcamera.com/rl/00268/00268.pdf