stephen_curran1 Posted October 20, 2014 Share Posted October 20, 2014 <p>To The Experts:<br> Can any one tell me why, I get a large circle like looking through a tunnel on my developed slides, when I use a Cir Pol filter on<br> my 50 mm lens (Mamiya). My camera is RZ ProII D. <br> How can I correct this? </p> <p>Thank you<br> Steve</p> Link to comment Share on other sites More sharing options...
howard_m Posted October 20, 2014 Share Posted October 20, 2014 <p>My guess is that the polarizer is too thick or youre using it on top of an already in-place filter or something like that is causing it to intrude on the field of view of the lens</p> Link to comment Share on other sites More sharing options...
steve_parrott Posted October 20, 2014 Share Posted October 20, 2014 <p>Keep in mind, a 50mm lens on medium format is not like a 50mm on a 35mm camera. A 50mm lens on MF is approaching wide angle, and thus it is very possible that the frame of the filter is being "seen" by the lens. Either do as said in the other answer and be sure you are not stacking the polarizer filter on top of another filter and you may even have to use a "slim" polarizer filter that has an extremely shallow mount to try to prevent problems on a semi wide angle lens.</p> <p>One other thing. You may find you get some "banding" in the sky when using a polarizer filter with a 50mm lens on a MF camera. The lens will often be capturing more area than can be polarized by the filter and create ugly banding of different shades of blue in a large expanse of sky.</p> <p>Your best bet would probably be not to use a polarizer filter on any lens with a focal length of less than 80mm on a MF camera. </p> Link to comment Share on other sites More sharing options...
stephen_curran1 Posted October 20, 2014 Author Share Posted October 20, 2014 Thanks Howard I used a step-up ring 77-82 , I think your right. I am wondering if the is a solution to this problem? Steve Link to comment Share on other sites More sharing options...
howard_m Posted October 20, 2014 Share Posted October 20, 2014 <p>you could try a native 77mm filter or get one of the superbig ones like the Lee 105 and their wide-angle mount. The problem is solvable.</p> Link to comment Share on other sites More sharing options...
savagesax Posted October 21, 2014 Share Posted October 21, 2014 I'm not sure if this will help because of not knowing which filters you own. Some of the better filter companies make a "Slim" filter. Needless to say it's thinner in comparison to the regular filter. Howard, thats a great idea you have! Link to comment Share on other sites More sharing options...
peter_fowler Posted October 21, 2014 Share Posted October 21, 2014 <p> I've the Mamiya 7 with their polarizer and I might suggest as was mentioned earlier, a polarizer on that wide a lens<br> that includes the sky will not bring happiness (banding is blatantly obvious). Peter</p> Link to comment Share on other sites More sharing options...
jmlphotography Posted October 24, 2014 Share Posted October 24, 2014 <p>This might be helpful: http://www.luminous-landscape.com/tutorials/polarizers.shtml</p> Link to comment Share on other sites More sharing options...
david_henderson Posted October 24, 2014 Share Posted October 24, 2014 <p>The vignetting will be solvable, probably most easily by a slim filter. The differential polarisation you often get when using a polariser with wide lenses is not. If you want to darken blue skies with wide lenses, may I suggest ND graduated filters with a wide angle holder .</p> Link to comment Share on other sites More sharing options...
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