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Thread: Always on Filter

  1. #1
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    Default Always on Filter

    Hi all,

    Need your views and advises....

    I've just bot a Cpolarizer and wonder it is advisable to leave in on the lens all the time. I've 2 UV filter which i keep on on my 2 lens.....and i wonder whether i could put 1 on CP and 1 on UV.

    My 2 lens are zooms (17-55 and 70-200)

    tks

  2. #2
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    Quote Originally Posted by megkris
    Hi all,

    Need your views and advises....

    I've just bot a Cpolarizer and wonder it is advisable to leave in on the lens all the time. I've 2 UV filter which i keep on on my 2 lens.....and i wonder whether i could put 1 on CP and 1 on UV.

    My 2 lens are zooms (17-55 and 70-200)

    tks
    the CPL is not a protection filter. It will cut out 1 1/2 to 2 stops of light. Put UVs for each instead.

  3. #3
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    tks,

    can i screw the cpl with uv together when in use...?

  4. #4

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    can try lor, but most likely will vignette abit. take a few shots and see la.

    ~MooEy~

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    Quote Originally Posted by megkris
    tks,

    can i screw the cpl with uv together when in use...?
    it's a matter of the glass thickness. The more expensive brands are thinner so vignetting as mentioned by mooey might not occur if you stack them. It is still not advisable as image quality might still be compromised. better to remove the UV before screwing on the CPL.

  6. #6
    Senior Member sammy888's Avatar
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    Default

    I've just bot a Cpolarizer and wonder it is advisable to leave in on the lens all the time. I've 2 UV filter which i keep on on my 2 lens.....and i wonder whether i could put 1 on CP and 1 on UV.

    My 2 lens are zooms (17-55 and 70-200)

    You have two very good quality lens there! If you are thinking of putting these two filters on the front of any one of them, you might as well get yourself some entry level lens where you will have lower quality pictures and you lose some F-Stops as well heheh...

    The C-polariser is a specialised filter. It only works in certain situation and yes you need a good sunshine to really make full use of it. To have it always on your lens is troublsome. You lose about 1.8 f-stop of lighting with it on. No big deal in bright sun light but when you are shooting indoor, losing that much light can be the difference between shooting your shots with you hangs as oppose to placing it on a tripod or end up taking blurry movement shots due to the slower shutter speed to compensate for the lack of light. You will be surprise how you could forget all about it having it on the front of your lens sometimes. You might not notice it too much till it is too late...especially when you go from outdoor to indoor and your eye's iris dims things down as it adjust slowly to a darken environment.

    Since you mentioned you have a 17-55 wide zoom. A normal C-polariser will show some sign of darken corners for sure. You can only get away with it if you invest ( which I think you should since yo uhave invested in that expensive piece of glass, 17-55mm) in a thin rim mount type C-Polariser. And yes they usually cost more but they come with a much thinner rim mount so that the filter (glass) will be place alot closer to your lens' front glass and the tip of the rim mount will also be further back thus when you shoot at 17mm and full open your f-stop, the darken corners will still not show up. The other solution would be to buy one of those filter adapter which lets you fix a larger filter size to your existing lens' filter size. ( 62mm=lens and filter=67mm ) So you can imagine if you attempt to place two filter together..it will definitely create the darken corners and it will be alot more prominent too since you double stack it. Two filters especially on a ultra wide lens is a NO-NO.

    Yes you can double stack two(or more) filters if that turns you on bro hehe...but do it at the expense of quality of picture. Your lens is already made up of quite a few glass elements.Add more will just degrade the quality and might even marred the Autofocusing just a tad...even if you are using quality filters. Granted you might not see much difference but for those shooting with good films, slides or maybe even high grade digital SLRs will attest that it can effect the quality to some extend and depending on what combination of filter types you use.

    At the very most as a rule..never have more then one filter on your lens. There is a reason why Prime lens are alot better for crucial sharp shoot. Why? Less glass elements then those in zoom. Get the hint?

    My two cents anyway.....

  7. #7
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    Best only use one filter a time.
    Take off the UV when using CP-L.
    For low light condition, don't use CP-L, UV is fine...
    TO SEE, TO FEEL, TO PHOTOGRAPH.

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