The 'operating manual' that came with my 600 FA states that the front glass
is called the PF (protect front) filter and is there to "protect the front
element. The PF filter is always recommended for use as it is designed to
work as the part of the optical system".
It makes no mention about the need to use a filter in the rear filter
holder. The lens comes with 7 43mm filters including a normal, skylight,
cloudy and UV along with yellow, orange and red.
Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message -----
From: "Stan Halpin" <[email protected]>
Subject: Re: Filters?
Possibly. My understanding is that lenses with back-end filter drawers
have their optics designed with the expectation that another piece of
glass will be in the path of the photons streaming toward their final
destination. Having no filter there is possibly degrading your images.
On the other hand, I don't believe that more typical lenses with
front-mounted filters are necessarily designed with the same assumption.
So I wouldn't draw the conclusion that filters are universally a good
thing.
I've always assumed that the design compensation for a rear filter was a
trade-off. Such lenses tend to require huge (expensive) filters. So,
rather than make you bear the cost of expensive add-ons, they assume a
(rear) filter will be in place and compensate for it. And probably design
a set of the "necessary" high-quality filters that fit the drawer and
conform to their design. Maybe I am giving the lens designers too much
credit . . .
stan
On Nov 4, 2013, at 6:07 PM, Rob Studdert wrote:
My A*300/2.8 has a filter drawer but has never had a filter in there,
will my images magically improve if I put one in? :)
On 4 November 2013 11:29, <[email protected]> wrote:
Interestingly, along a similar lines, my 600 (and other Pentax lenses
with
drop in filters) requires a filter in place for optimum performance
although
I've never tested to see effects without a filter.
Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message ----- From: "Larry Colen" <[email protected]>
Subject: Re: Filters?
Yup he lists exactly the situation I said you would see effects in.
Other
than that has any one actually done any side by side testing to see if
they
see any differences? Or is it just more fun to argue without being
hampered
by facts?
And I mean test with one filter, not ten stacked up.
Mark Roberts <[email protected]> wrote:
Here's the article I was referring to earlier:
http://www.luminous-landscape.com/columns/sm-feb-05.shtml
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