The rubber eye cup protects
the viewfinder from light reflections that can make focusing difficult in
strong-light conditions. Eye caps for the first Autoreflex SLRs are attached
to a metal ring that screws onto the round eyepiece. Eye cups made for use on
rectangular eyepieces (from the Autoreflex TC) are attached to a rectangular
frame that clips onto the eyepiece. There are also eye cups whose rubber
part has the shape of an ellipse. These offer additional light protection on
the side of the temple.
The loupe mounts on the
eyepiece and magnifies the central portion of the image to allow precise
focusing in difficult conditions such as when working with telephoto lenses,
in macro photography or with a microscope. In order to look into the eyepiece
normally, a hinge allows the loupe to flip upwards.
This accessory, a bit like
an inverted periscope, makes it possible to compose and focus while looking
downwards. In this manner, one can take pictures with the camera at chest
level or with the aiming axis level with the ground without having to lie
down. This accessory is also very convenient when the camera is mounted on a
microscope of a reproduction stand. A metal adapter allowing the use of the
later angle finder on earlier eyepiece is also available.
Dioptric correction lenses
To facilitate viewing for
glass wearers, there is a series of corrective lenses which can be screwed on
the eyepiece. These lenses come in 6 types: -3, -2, -1, +1, +2 and +3 diopters.
Of course, there are lens versions for the the first SLRs (round eyepiece) and
for the later ones (rectangular eyepiece).