Olympus Focusing screen 1-12. Cross hairs-clear field type. (for close-up & greater than life size macro photography.)

Olympus Focusing screen 1-12. Cross hairs-clear field type. (for close-up & greater than life size macro photography.)
The transparent screen offers the photographer focusing with an unusually bright finder image ideal for macrophotography of 1:1 or over , and for photomicrography.
To focus , first correct your diopter using a dioptric lens or varimagnifier so each line of the double cross hairs can be seen clearly and separately . Then bring the specimen in to focus.
The meter needle gives correct light readings , but depending on the specimen condition , the reading must be compensated for.