Choise of optics ?

[yaleo]

Good evening
on the choice of optics. If I chose a 25 mm collimator what will I use the viewfinder? One of the 35mm I guess. If I chose a 35 mm collimator what will I use the viewfinder? One of the 50 mm I suppose. And finally, if I chose a 28 mm collimator what will I use? Because nothing in the viewfinder corresponds to a length of 42 mm! In advance thank you.
Yann

 

[ampguy]

it's already calculated for you

it's already calculated for you

Just set the framelines to what your lens length is, or as close as possible, so for a 25mm lens, set it to 28.

35mm = 35 setting, 50mm = 50 setting, 75mm = 50 setting, but lines are then a bit wide and long, still works great.

Good evening
on the choice of optics. If I chose a 25 mm collimator what will I use the viewfinder? One of the 35mm I guess. If I chose a 35 mm collimator what will I use the viewfinder? One of the 50 mm I suppose. And finally, if I chose a 28 mm collimator what will I use? Because nothing in the viewfinder corresponds to a length of 42 mm! In advance thank you.
Yann