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there is really nothing in it Both are very sharp lenses Sigma is also a close focus lens and you can get down to 10cm!! which is very useful too Sigma is half the price of the Canon buy the Sigma!!

  This isn't true.   Their more recent Primo line may only offer a 35mm but that's not the widest offered by Panavision now or historically.   In fact, their wider offerings are in their smaller, lighter line for use in applications like hand-held, steadicam, etc.  Sounds like DSLR territory to me.   Diopter diameter may not be the most appropriate way of determining widest taking lens but neither is personal bias.

don't let smaller size dictate your diopter options. a 72mm diameter wont vignette on any usable focal length. if it vignettes with a 72mm diopter it means you are using too wider taking lens and likely will be full of CA and edge softness anyway. a nice rule I feel should be made testament when using any anamorphic adaptor (based on the fact that panavision offer 35mm widest option (designed for 4 perf 35mm film). If panavision and users of panavision dont feel the need for wider than 35mm on anamorphic then why would anyone else?:- s35 or aps-c:- no wider than 35mm taking lens m4/3:- no wider than 25mm taking lens (providing similar field of view to a 35mm lens used with s35 sensors) s16mm:- no wider than 16mm taking lens (as above) if making decisions like using a 12mm taking lens are dictating your diopter choice your priorities are wrong. Just because people dont see vignette when using a gh2 with a 20mm pancake doesnt mean the images are lacking in other nasties like CA and horrible soft edges. Id rather use a longer taking lens, get less edge distortion/CA and be able to use magic diopters like the +0.4 than use a wider taking lens and have to invest £350 in a century diopter of 105mm. just my take. re. attaching diopters. buy some panels of balsa wood, 10mm thick (easy to cut with a scalpel), cut a 72mm hole in it so the tokina sits in snug (use the outside edge of the tokina as your stencil). cut the balsa wood so it is the same size as the front of the la7200. glue some neodymium magnets or velcro to the balsa wood and the la7200. remove the diopter and then stain the balsa wood with a wood stain that dries hard - so it absorbs into the wood and wen dry adds strength. in order to ensure you get as little possible vignette you want the diopter to be as close to the front element of the la7200 as possible

thanks a ton guys. I am going to go with the SLR...    I have 2 other questions I was wondering if anyone could help with:    1. I'm going to get a "standard" lens as well and I think I am going to get the canon FD 24mm or the canon FD 28mm (I am going with the canon FD's because I already have that adapter for the gh2) - are these decent lenses? Of the two, which would be better? (should i just spend more and get that C mount pentax cosmicar 25mm?)   2. And my second is kind of unrelated but I still can't find an answer. Can someone recommend a good viewfinder for the gh2 that will help block the sun? I use the EVF thats built in but I can't see what I am shooting when its really sunny out so I need SOMETHING to help me shoot outside and see what I'm shooting.