Filter
Top Products
Addendum
New shutter speed up to 1/8000 sec
Pentax designed a new shutter mechanism for the K-7.
The shutter blades are lighter in weight, the magnetic
attraction to generate more driving force from the motor
has been optimized, and the unit is built with abrasion
resistance. That translate to a shutter mechanism that can
withstand more than 100,000 shutter releases and allows
shutter speed of up to 1/8000 sec. That is fast by any
standard.
Autofocus adjustment chart
Autofocus Adjustment for the Pentax K-7, Custom Setting No 37, and how to check
the Auto-focus accuracy
Autofocus Accuracy, Back & Front Focusing Problems
I personally never had any auto-focusing problem with any lens or camera I ever
owned. It seems that these days, members of every blog and forum sites are talking
about checking and adjusting the auto-focus on their lenses or DSLR. I think there is
a perception that many lenses or DSLR cameras are having front or rear focus
problems. In reality, I am inclined to think that novice photographers, “Pixels
Peepers”, and inquisitive hobbyists, influenced by the available internet information,
are finding problems where there is none. If a particular lens consistently gives out-
of-focus results, when all other lenses used with the same DSLR are okay, you
might have a focusing problem with that particular lens. If most of the pictures taken
with the same DSLR, but with various lenses, are out-of-focus, you might have a
DSLR camera-focusing problem.
Page 245
If you think there is a focusing problem, several auto-focus testing charts are
available from forums, blogsites and websites. I probably downloaded most of them
and found inaccuracies with all of them. They are either too small, or too cluttered,
or have measurements that are not to scale, etc. My own chart, published on my blog