chikid68 wrote:
The cheap Opteka lens generally has a fixed aperture
of 8.0 but also is not coated so while the aperture is
smaller than the 75-300 the coating on the 75-300
reduces the light to a degree.
Also the Opteka being fully a manual lens will not
provide any information to the camera which causes
the camera to read it as f0. 0 and provides the light
amount for such an open aperture which will overexpose
the image.
That lens will only work properly in full manual mode.
br The cheap Opteka lens generally has a fixed ap... (
show quote)
The above is quite wrong ... except for
the remark that the aperture will show
up as "0.0". But everything else is way
off, even opposite of reality.
The lens IS coated.
It does have an ADJUSTABLE aperture.
Coatings do NOT reduce light transmission.
It WILL work perfectly on auto exposure.
It will NOT cause over exposure.
Just use it. It's not rocket science and no
tricky bidnez is involved. I have used such
lenses with EVERY genre and generation of
interchangeable lens body you ever heard
of. IOW,
I tell you what I KNOW, not just
stuff I read and failed to comprehend, as
describes too much of the "advice" around
here lately.
Enjoy.
=========================
BTW, to use auto exposure, A-mode will be
fine with any camera. Most cameras just act
like A-mode when you set P or S mode with
such lenses, so thaz cool. BUT, until you test
to
confirm that P and S are same as A, just
stick to A-mode for auto exposure.
.