Those little plastic windows appearing on lenses

On 2015-09-27, RichA wrote:
They are being used on Zeiss, Tamron, others. Little clear plastic
windows that show the focusing distances underneath. Unfortunately,
this is meaningless, unless you use your cameras as crude
range-finders. What would be better would be with hyperfocal distance
indicators, which these lenses don't have, and they also don't have
f.stop indicators anywhere either. This minimalist look might be
aimed at people more interested in look than function.

http://tamron-usa.com/F012_F013speci...tm_term=BANNER

There's a generation (or even a second one by now) so accustomed to zoom
lenses as standard that they wouldn't know what to do with a depth of
field scale or hyperfocal distance marker if they noticed it at all.
But leaving such information off a prime lens does seem to be rather
penny-pinching and makes the lenses less convenient for users who
actually know what they're doing.

Perhaps if potential buyers leave the shop without buying, after
explaining why, the makers will restore the scales.

Presumably the aperture indicator is part of the viewfinder or rear
screen display on the cameras these lenses are built for. It should be
possible to include depth of field scales there too, of course - which
is down to the camera body maker rather than the lens maker. In-camera
scales might even work with zoom lenses ...

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