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Lumicon 2" focal reducer
I have a "Lumicon 2"" Thread-In Focal Reducer, 48mm Male Filter Threads, Attaches to 2"" Eyepieces, Attaches to 2"" Diagonals, Made in the USA 2".
I wish to determine the focal length of this focal reducer so that I can determine if it is suitable for its use photographically as well as visually.
How would I go about determining its focal length?
Any easy suggestions more than welcomed.
Ive attached a photo of the beast - cant get any information as Lumicon have ceased production of them.
Thanks, Allan
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