Discussion of lenses, brand or independent, uses and merits
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David Kilpatrick wrote:Also, the quaity of the Hoya filter is very high. I found that even my Rodenstock UV on my 70-300mm was destroying sharpness at 300mm. I have just been using my Hoya for a week with perfect sharpness. On the last day, I totally forgot it was on the lens. I even shot indoors with it. It takes much less light away from an older type polariser.
David
I have always suspect my Hoya CPLs are not good enough....there is always a thick greasy coating on it. I can of course remove it with alcohol swab but the quality always seem to be mysteriously less than desired.
pakodominguez wrote:But I think you problem is not because the kind of filter, but because the amount of light: at 300 mm, your lens is a f/5.6, and your polarizer takes about two stops of light. Usually camera makers recommend f/8 as minimum for the AF system working properly.
A polarising filter (or any kind of filter) does not turn f/5.6 into f/8 or f/11 but just takes away some of the light—which is two entirely different things. The AF system needs the cone of incoming rays to be a certain minimum diameter. Stopping down beyond f/5.6 will decrease the diameter below the limit. Putting a filter on the lens won't.
The loss of shapness at long focal lengths is due to the filter glass being poor quality—which is not to be expected in a Sony/Zeiss product but alas! I guess there's an occasional lemon lurking everywhere.
Dr. Harout wrote:Anyone knows if there is a hood for the 70-300G but with a hatch to use the polarizer?
Sony A700, A580, Nex-5t, KM D7D & VC-7D, M Dynax 500si
KM 17-35 F2.8-4 D, M 50 F1.7 RS, M 135 F2.8, M 28-100 F3.5-5.6 D, M 100-200 F4.5, T 70-300 F4-5.6 Di USD, S 18-55 F3.5-5.6 SAM, S 18-70 F3.5-5.6
Sony hvl-f42s, Minolta 3600 HS D
Sony Z1C & Z2
Dr. Harout wrote:Seb, I'm looking for a decent looking one. I can do that, but once opened it will stay that way. I prefer with a movable hatch.
Of course did a little search but did not stumble over any I'm afraid...
Sony A700, A580, Nex-5t, KM D7D & VC-7D, M Dynax 500si
KM 17-35 F2.8-4 D, M 50 F1.7 RS, M 135 F2.8, M 28-100 F3.5-5.6 D, M 100-200 F4.5, T 70-300 F4-5.6 Di USD, S 18-55 F3.5-5.6 SAM, S 18-70 F3.5-5.6
Sony hvl-f42s, Minolta 3600 HS D
Sony Z1C & Z2
I have always suspect my Hoya CPLs are not good enough....there is always a thick greasy coating on it. I can of course remove it with alcohol swab but the quality always seem to be mysteriously less than desired.
did a little search but did not stumble over any I'm afraid... 