| focal length, fresnel, objective (beginner stuff) - Click HERE for Original Thread |
| ppmz |
Hi All,
This is a real newbie question, but it's hard to know what keyword to search for to find this answer.
I have the following items:
TFT: 15" (381mm)
Fresnel: Focal length 220mm/317mm
Objective: Focal length 320mm
Is my diagram correct? Is there more to be considered? Does the objective's focal only determin the image size, and nothing else?
I suppose the TFT size doesn't matter, as long as the fresnel covers it?
Thanks. |
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