It also provides other outstanding features rivaling those of high-end models, including: the PENTAX-developed AA (anti-aliasing) filter simulator first installed on the PENTAX K-3 (launched in November 2013); an optical viewfinder with a glass pentaprism
to provide approximately 100% field of view; an in-body shake reduction mechanism; and a top sensitivity of ISO 51200.
The camera boasts a glass pentaprism
high-performance optical viewfinder with approximately 100% frame coverage (FX format).
The viewfinder is the same 100 per cent pentaprism
that's found in the D4 and D800, but it does have a different eyepiece.
The DMC-GF1 does notcontain the pentaprism
found on other standard interchangeable lens cameras.
To measure the squareness of axes, a pentaprism
is used to bend the autocollimator light beam accurately 90 deg.
viewfinder with 100% field of view and 0.
5 fps, and an optical viewfinder utilizing a glass pentaprism
The classically styled camera recalls design cues such as a recognizable pentaprism
and top cover, which is now constructed of durable, lightweight magnesium alloy.
A high-performance optical viewfinder utilizes a glass pentaprism
and offers approximately 100% frame coverage
The EOS 7D camera's viewfinder includes a large all-glass pentaprism
with an antireflective coating to maximize clarity and provide a brighter display.
Translucent Mirror Technology, which eliminates the need for a full-frame moving mirror mechanism and heavy glass pentaprism
, also contributes to the extremely light design.
, built-in diopter adjustment (-2.