Jim Kasson

Jim Kasson

Carmel Valley, California

https://blog.kasson.com/about-2/who-am-i/

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  • Jim Kasson
    Jim Kasson
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    Posts: 70
    Sharpness is Overrated
    on: August 4, 2020 at 5:00 pm

    I wish that the author had also discussed sharpness & sensor pixel density from the perspective of light diffraction. Its all very well to push for more pixels but be ready to pay big for lenses that can handle the diffraction that will match the pixel density of a 60+ MP full-frame sensor.Funny, I haven’t seen any reviews that address this.

    https://blog.kasson.com/gfx-100/a-visual-look-at-gfx-100-diffraction-blur/

    https://blog.kasson.com/the-last-word/diffraction-ultimate-ff-pixel-count/

    https://blog.kasson.com/the-last-word/15318/

    https://blog.kasson.com/the-last-word/maximizing-dof-in-the-face-of-diffraction/

     

     

     

    Jim Kasson
    Jim Kasson
    Participant
    Posts: 70
    Re: Considerations for Remote Instruction Using Internet-based Technology
    Reply #1 on: July 24, 2020 at 11:46 pm

    I figured a way to get the sidetone right. I got a Blue USB mike with a built-in low-latency speaker amplifier and plugged the headphones into that.

    Jim Kasson
    Jim Kasson
    Participant
    Posts: 70
    Re: Considerations for Remote Instruction Using Internet-based Technology
    Reply #2 on: July 24, 2020 at 6:54 pm

    Please comment on the best ways to get low-latency sidetone at the appropriate level. I haven’t solved this, and I usually operate with no sidetone at all, which, with the over-the-ear headphones I need because of my hearing aids, is pretty bad.

    Is there a way to solve this short of a preamp and a mixer?

     

    Jim

    • This reply was modified 2 years, 4 months ago by Jim Kasson.
    Jim Kasson
    Jim Kasson
    Participant
    Posts: 70
    Re: New Article Announcements & Discussions
    Reply #3 on: July 3, 2020 at 10:15 am

    You listed these criteria:

     

    Resolution – for given sensor size, relates to pixel density and capture of fine detail

    Noise Generation – caused by heat build-up from high pixel densities and using high ISO’s

    Dynamic Range – how many exposure zones in f-stop equivalents a sensor can handle between pure white and pure black beyond which no detail information exists

    Color Accuracy – Fidelity of color recording, usually related to sampling levels & sensor design

    Color Gamut – the amount of color information a sensor produces, e.g. 16-bit vs 14-bit

    Sensor Uniformity – the extent to which quality control can eliminate errant pixels & flaws

    I believe that artifacts are a big component of IQ. Raw file, mostly sensor-based, artifacts include, but are not limited to:

    • Luminance aliasing
    • False-color aliasing
    • PDAF striping
    • PDAF banding
    • Amp glow
    • Blooming (not so much anymore)
    • Stepper inconsistencies — probably included in sensor uniformity
    • Column ADC/amp inconsistencies — probably included in sensor uniformity
    • Spatial filtering (eg star-eating)
    • Compression artifacts (like craw’s)

    Also, precision and gamut are different things. Changing precision from 16 to 14 bits does not affect gamut.

    Jim

     

    • This topic was modified 2 years, 5 months ago by Jim Kasson.
    Jim Kasson
    Jim Kasson
    Participant
    Posts: 70
    Re: Olympus Says Goodbye
    Reply #4 on: June 25, 2020 at 6:52 pm

    Will Olympus continue to make microscopes?