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Message: <blockquote data-quote="Fowl Mouth" data-source="post: 1714868" data-attributes="member: 30266">All great points. This is not meant to stir up emotion among 400 1:4 DO owners, since I do feel it is a great lens. I still don't think, however, that is is on par with the L lenses surrounding it, in regards to IQ. That might be the #1 reason they aren't moving forward with this technology in big lenses. It's a great concept, and you don't break new ground until you put yourself on the limb to try out new technologies. Certainly the cost factor would have to be an important part of why there aren't other big DO's. But I think pros will nearly always swallow cost when it gives them a better product. The DO's aren't better products, and therefore Canon won't sell as many until they are. The 400 1:4 fills a niche, and might be why they just get by with sales. A 500 5.6 DO IS would be awesome in use, but also cost prohibitive, in my estimation. It would likely cost as much as a 500 1:4, or more. Good for pros if the IQ is there, but bad for me. :-O</blockquote>