JimKasson

JimKasson

Lives in United States Monterey, CA, United States
Works as a Retired Electrical Engineer
Has a website at blog.kasson.com
Joined on Feb 22, 2014
About me:

http://blog.kasson.com/?page_id=2285

JimKasson's recent activity

  • I'm going to assume f/0.707, since that's a whole stop. I'll also assume that is equivalent for the MF format chosen. On as per mm basis, yes. On a per picture height basis, no, if they were ...
  • OTOH, I've served on the boards of two private secondary schools, one day and one boarding. In both cases, graduating with a year of calculus is typical, and graduating with two is not unusual. Whe ...
  • You will find no math in that book beyond high school trig and algebra, and those are not advanced, even for a 17-year old.
  • Hang on to that 32-60. Collectors will pay big bucks for that lens, like they do for stamps with the airplane upside down. 😉 Jim
  • Replied in What MF?
    Bottom line for me: after I started using the GFX 50S, I sold my HxD cameras and lenses. Another data point. My camera dealer handed me a 100 MP P1 with an 80 mm lens and told me to try it out for ...
  • Not sure how much you want to learn but you could read Chapters 1, 2, and 3 of this book: http://www.trenholm.org/hmmerk/TIAOOFe.pdf I'd be happy to answer questions. That is true in the GFX. Also ...
  • Replied in Sharpening
    I used Helicon for these. I could go into Helicon and create masks to fix it. That would be the high road. But for little stuff like in this image, I just use cloning and content-aware fill. Jim
  • And a welcome one.
  • OK. Let's start. Do you know about how the circles of confusion (CoCs) on the sensor relate to the depth of field? Do you have an idea of what size CoC is acceptable to you? Jim
  • This is an exaggeration, I believe. Possibly for rhetorical purposes. I will also note that this test did not look at corner sharpness. Jim
  • Yes. I can calculate the pixel pitch for a balanced system at that f-stop. https://blog.kasson.com/the-last-word/whats-your-q/ 0.5 * 0.5 / 2 = 0.125 um = 125 nm. For a FF sensor that would be ...
  • If we're going to talk about focus bracketing, we're going to have to talk about numbers: DOF, CoC, magnification, etc. There's just no way around it, IMHO. I know you've objected to a numerical ...
  • True: http://www.josephjamesphotography.com/equivalence/ Not if you keep opening up the lens, which you can't do as easily with small formats. Where'd that number come from? Not true. Until you get ...
  • F/5.6 isn't going to show the differences between the cameras and lenses as much a a wider stop would, but is probably realistic for landscapes. However, I think it would be a good idea to use equi ...
  • Replied in Sharpening
    Yes. I use the GFX focus bracketing feature for that. During the capture sequence, the focal plane in the object field moved about two inches. No. Most of that is a real refraction effect, but some ...
  • Sure. But there are other tools in Ps that can be used in conjunction with it, like skew. In fact, I often use skew to align verticals. In architecture, you can use bubble and laser levels plus ...
  • Replied in Sharpening
    This was a studio shot.
  • Replied in Sharpening
    Sounds like you never stack.
  • Replied in Sharpening
    So you would have done that image in one capture? There are three stages to sharpening, IMHO: Input sharpening removes some or all of the capture blur, without overemphasizing aliased data. If the ...
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