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Thread: Need help with step-down filter ring.

  1. #1

    Default Need help with step-down filter ring.

    I'm looking for a step-down filter ring to attach a 67mm filter to a 77mm lens. Does anybody know where to get one?

    The lens will be operating exclusively at 24mm, F4 with the filter attached. Will vignetting occur?

    Thanks for any information.

  2. #2

    Default Re: Need help with step-down filter ring.

    Quote Originally Posted by ArchRival View Post
    The lens will be operating exclusively at 24mm, F4 with the filter attached. Will vignetting occur?
    What is the focal length? I'm assuming 24-70. Yes, you will have very heavy vignetting.
    Alpha

  3. #3

    Default Re: Need help with step-down filter ring.

    The lens i'll be using it on is a Canon 24-105 F4L. At 24mm, F4, the effective aperture should be only 6mm. Will vigetting still occur?

  4. #4
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    Default Re: Need help with step-down filter ring.

    As long as you're using a step-down ring, vignetting will occur - you're effectively "blocking" the lens.
    I need to cultivate my artistic eye!

  5. #5

    Default Re: Need help with step-down filter ring.

    Yes it will. And you need to review the calculations a bit. It's not a perfectly linear formula in relation to the aperture size.
    Alpha

  6. #6

    Default Re: Need help with step-down filter ring.

    Quote Originally Posted by ArchRival View Post
    The lens i'll be using it on is a Canon 24-105 F4L. At 24mm, F4, the effective aperture should be only 6mm. Will vigetting still occur?
    Not as simple as that. If you already have a 67mm filter handy, just hold it in front of your current filter (as an approximation of the step-down ring thickness) to get an idea.

  7. #7
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    Default Re: Need help with step-down filter ring.

    Quote Originally Posted by ArchRival View Post
    The lens will be operating exclusively at 24mm, F4 with the filter attached. Will vignetting occur?
    Definitely.


    Just a question though. Why do you want to attach a 67mm to a 77mm L lens?

  8. #8

    Default Re: Need help with step-down filter ring.

    Quote Originally Posted by Daedalus Trent View Post
    Definitely.


    Just a question though. Why do you want to attach a 67mm to a 77mm L lens?
    Probably to save money on the cost of larger filters.

    A bit of a waste to then invest in an L lens, really.
    Alpha

  9. #9
    Moderator catchlights's Avatar
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    Default Re: Need help with step-down filter ring.

    Quote Originally Posted by ArchRival View Post
    The lens i'll be using it on is a Canon 24-105 F4L. At 24mm, F4, the effective aperture should be only 6mm. Will vigetting still occur?
    the aperture is near the focal plant, hence it is very small.

    if using a 67mm filter will not cause vignetting on a 77mm filter thread lens, why would the lens manufacture want to make this lens with 77mm filter thread in the first place??
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  10. #10
    Moderator catchlights's Avatar
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    Default Re: Need help with step-down filter ring.

    btw, if you insist, you still can use 67 filter filter, probably you will not have vignetting from 50mm onwards.
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  11. #11

    Default Re: Need help with step-down filter ring.

    Quote Originally Posted by catchlights View Post
    btw, if you insist, you still can use 67 filter filter, probably you will not have vignetting from 50mm onwards.
    As he said, he's using it exclusively at 24mm.


    So, TS... Why not just get a 24mm prime lens?
    Alpha

  12. #12
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    Default Re: Need help with step-down filter ring.

    definitely would get vignette bro...

    frankly, i got a bit lucky that to know there's step up ring available before buying any filter... so i got only one polarised filter which is 77mm... other smaller ones just step up to 77mm then can use the polarised filter... while most lens got its own UV filter because too lazy to add step up ring and add UV filter when changing lens... and UV filter not so exp to save too...

    TS, maybe you should consider selling your 67mm one and get the 77mm one plus other step up rings... since most of the higher end lens are with 77mm filter size (assuming you'll carry on to buy those higher end lenses)...

  13. #13

    Default Re: Need help with step-down filter ring.

    Quote Originally Posted by Edwin Francis View Post
    Not as simple as that. If you already have a 67mm filter handy, just hold it in front of your current filter (as an approximation of the step-down ring thickness) to get an idea.
    Yes i did that and snapped a picture. No visible vignetting through the viewfinder and the image looked ok, but i'm not sure what happens at long time exposures.

  14. #14

    Default Re: Need help with step-down filter ring.

    Quote Originally Posted by Daedalus Trent View Post
    Definitely.


    Just a question though. Why do you want to attach a 67mm to a 77mm L lens?
    Well......the filter was about 1/3 the cost of the 24-105F4L.

  15. #15

    Default Re: Need help with step-down filter ring.

    Perhaps i should mention the lens is on a 400D with APS-C sensor.

  16. #16
    Member Reim1o's Avatar
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    Default Re: Need help with step-down filter ring.

    Lets do the rough math:

    77/67 = 1.149 < 1.6 crop

    Most probably you won't get vignetting if your using cropped sensor
    What kind of filter costs 1/3 of a 24-105?

  17. #17
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    Default Re: Need help with step-down filter ring.

    Quote Originally Posted by ArchRival View Post
    Perhaps i should mention the lens is on a 400D with APS-C sensor.
    Oh...that explains a lot
    Well, if you tried it yourself then i guess it isn't a prob then.

    and 1/3 the cost of your lens? What filter is that?

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    Default Re: Need help with step-down filter ring.

    special effect filters? all my filters added up (3UV 1CPL 2 Step-up rings) also haven't reach 200 le...

  19. #19
    Member Reim1o's Avatar
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    Default Re: Need help with step-down filter ring.

    My most expensive filters are 77m IR and hot mirror, bought for 120usd each.
    Even B+W 77mm CPL is only around 150usd

  20. #20

    Default Re: Need help with step-down filter ring.

    Thanks for the replies, dudes. Filter rings are cheap, so i went out to get a 77-72 and 72-67. Here are some test shots.
    All are with the 24-105 F4L on Canon 400D body.

    Top: 24mm F4 with 77mm UV attached.
    Bottom: 24mm F4 with 67mm UV filter on the rings attached to 77mm UV filter.






    Top: 105mm F4 with 77mm UV filter attached.
    Bottom: 105mm F4 with 67mm UV filter on the rings attached to 77mm UV filter.





    Conclusion is you can use a step down of 77mm to 67mm on this particular lens on an APS-C sensor body without much visible vignetting.
    Last edited by ArchRival; 30th June 2009 at 12:34 AM.

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