1.25 vs 2 inch diagonal

I have a 12 inch Meade LX90 with a Williams Optics 1.25 inch dielectric diagonal. This means my current maximum field of view is only about 31 arc minutes.

If I switched to a 2 inch diagonal would it increase my field of view? If so, by how much?

Would it increase the brightness and/or contrast of what I see thru the eyepiece? If so by how much?


Keep lookin up......Mike

What size eyepieces do you have?

Alex

Mike Alexander said:

I have a 12 inch Meade LX90 with a Williams Optics 1.25 inch dielectric diagonal. This means my current maximum field of view is only about 31 arc minutes.

If I switched to a 2 inch diagonal would it increase my field of view? If so, by how much?

Would it increase the brightness and/or contrast of what I see thru the eyepiece? If so by how much?


Keep lookin up......Mike

A 2 inch diagonal will allow you to use 2 inch eyepieces. The maximum TFoV would be 51 arc-minutes if you had an eyepiece with a 46mm field stop. Brightness, because you could be using a longer focal length eyepiece at a lower magnification, the image could be brighter.

Jon