tag:blogger.com,1999:blog-4577546745078520453.post6357937253899004447..comments2024-03-28T00:16:56.038-04:00Comments on Lens Bubbles: Canon FD 20mm f2.8 S.S.C on Sony A7Lens Bubblehttp://www.blogger.com/profile/06445561503570800312noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-4577546745078520453.post-37042804773373488612014-06-11T23:05:07.697-04:002014-06-11T23:05:07.697-04:00With full frame one needs to be more careful with ...With full frame one needs to be more careful with hoods too. I find that get dark corners with just a slightly longer hood.Lens Bubblehttps://www.blogger.com/profile/06445561503570800312noreply@blogger.comtag:blogger.com,1999:blog-4577546745078520453.post-38826518458860407282014-06-11T23:03:09.998-04:002014-06-11T23:03:09.998-04:00It's true that some lenses are designed with a...It's true that some lenses are designed with a filter as part of its optical path. <br /><br />I tried the Makinon 300mm f5.6 mirror lens with and with the rear filter and it made absolutely no difference.Lens Bubblehttps://www.blogger.com/profile/06445561503570800312noreply@blogger.comtag:blogger.com,1999:blog-4577546745078520453.post-57611868883595057742014-06-11T19:16:22.809-04:002014-06-11T19:16:22.809-04:00Fred, I take with a pinch of salt Rogers claims. E...Fred, I take with a pinch of salt Rogers claims. Especially when he published that stuff about adapter alignment, its just not borne out in real world testing with tilt adapters on 43rds which are even more "misaligned"obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-4577546745078520453.post-44635604823517675952014-06-11T19:13:22.487-04:002014-06-11T19:13:22.487-04:00Interesting, vignetting is quite strong. I am of t...Interesting, vignetting is quite strong. I am of the view that I have seen similar vignetting reported on film with FD users saying stop down to 5.6 to clear that up. My OM21f3.5 does similar at these fstops.obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-4577546745078520453.post-15014435571454232902014-06-11T02:36:30.637-04:002014-06-11T02:36:30.637-04:00See Roger Cicala's two recent blog posts at le...See Roger Cicala's two recent blog posts at lens rentals.com regarding the heretofore largely obscure glass sensor-cap thickness variable -- it matters, particularly with wide angle lenses. Yep, something else to worry about, optical adaptologists! Perhaps this factor is relevant here...Frednoreply@blogger.comtag:blogger.com,1999:blog-4577546745078520453.post-78927062891900373432014-06-10T21:53:27.488-04:002014-06-10T21:53:27.488-04:00I was very surprised at the amount of vignette of ...I was very surprised at the amount of vignette of the lens. I guess f2.8 was considered very fast on a lens this wide.Lens Bubblehttps://www.blogger.com/profile/06445561503570800312noreply@blogger.comtag:blogger.com,1999:blog-4577546745078520453.post-81050794008287418802014-06-10T00:57:27.091-04:002014-06-10T00:57:27.091-04:00glad to see this is a general issue with wide angl...glad to see this is a general issue with wide angle lenses and not caused by 36MP sensor's high density. I have similar issues with my OM21F3.5 lens which I feel unable to focus properly. I do much easier with my OM24F2.8 which looks extremely sharp compared to the 21mm lens. Even vignetting is similar.MAWKhttps://www.blogger.com/profile/03912366114548575884noreply@blogger.com