ProfHankD

ProfHankD

Lives in United States Lexington, United States
Works as a Professor
Has a website at http://aggregate.org/hankd/
Joined on Mar 27, 2008
About me:

Plan: to change the way people think about and use cameras by taking advantage of cameras as computing systems; engineering camera systems to provide new abilities and improved quality.

ProfHankD's recent activity

  • Most brands of cameras do not fire the shutter immediately when you press the button, but delay firing the shutter until they sense the image is in focus. This normal behavior is disabled on most ...
  • Three quick comments: (1) The vast majority of 135mm lenses out there are quite good... even things like the little 135mm f/2.8 Auto Vivitar that often sells for under $10. Don't go nuts looking for the ...
  • As others have said, that sounds like classic field curvature -- which can be focus-distance dependent, so a nearer target might not have the same issue. There is also the possibility that the ...
  • Karl Persson: that's a trick that I documented works very well for APS-C lenses on FF (in a paper I published in Electronic Imaging 2016). However, the aspect ratio is different here, and taking...

  • Well, Photoshop supports SR much better that way than I expected! The real key is accurate subpixel alignment of the images, and upscaling and then pixel-level aligning is good enough for modest SR ...
  • The real advantage of Sony's rather-undersized "medium format" sensor should be that it could be used with FF lenses for alternative aspect ratios without needing a larger image circle. For...

  • At those prices, you might as well get the M42.  You certainly should read my Instructable on Kiev 10/15 adapters before even thinking about getting one in that mount instead of M42.  M42 is a lot ...
  • It could.  Might even be able to do something evil with polarization to control the shift without moving parts... but this is making my brain hurt.  ;-)
  • Mine was pristine too -- it was cheap because it is in the truly orphaned Kiev 10/15 mount. Fortunately, I made adapters.  :-)
  • The f/2.8 generally gets the most respect, but it's pricey, big, and rare. The f/4 is widely discussed as being the "best" of the others, but it depends. Apparently the f/4.5 is supposed to be a ...
  • That was a problem, but I'm not sure that was the only problem. The focus certainly was all over the place between those shots, but a shutter speed of 1/250s probably wasn't helping. A lot of ...
  • Lens sticking out of box takes weather, hole lets moisture and bugs in.  Is that ok? I'd lean more toward a sealed  box with a glass viewport and dessicant inside. Could hack any type of waterproof ...
  • Overall, probably better to just do standard SR... but read on....  ;-) Geared-down steppers would probably be the way to go, and could be very cheap with an Arduino-based controller.  Lots of ...
  • Stiff isn't normal for an old Minolta.  My 200mm f/4 MD Rokkor-X is really nice, relatively small and very smooth.  Then again, my 200mm f/3.5 Vivitars are not bad either (except for heavy axial ...
  • No Flektogons -- too expensive. However, I have a MIR20 20mm f/3.5 and two Auto Vivitar 20mm f/3.8 that all look a heck of a lot like the 20mm Flektogons. All three are quite good on FF, and the ...
  • That sounds sort-of reasonable. However, in this context, what is noise and what is noise reduction?  All you'd be distinguishing is ability of the camera to distinguish your noise-like scene from ...
  • Well, this we agree on.  :-( Actually, the state of the art in 3D printing is improving at a slow crawl. The problem is that designing 3D models of things is hard and designing them to be ...
  • All kidding aside, there was a video years ago of an idiot "repairing" a yellowed Takumar by smashing it with a sledge hammer.  That is the only way to make the radioactivity seriously dangerous: ...
  • The Samyang/Bower/Opteka/... is really a very good lens, although it is super touchy about focus. Here are a few quickies taken today doing full manual focus with it on my A7RII, with only minor ...
  • The only stamp-sized documents I've duplicated were 135-format photos of documents... I think the OP would have stated if they were doing such a specialized thing. In fact, the OP's original post ...
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Total messages 4550
Threads started 116
Last post 32 min ago
Total comments 1213
Total likes 2564
Last post 18 hours ago
Total reviews 18
Last review 1 week ago
Entries 91
Votes cast 1937
Last entry 3 months ago
Photos uploaded 154
Last upload Dec 19, 2010