John Sadowsky

John Sadowsky

Charlestown, MD

John S. Sadowsky is a retired wireless system and signal processing engineer. After 15 years as a professor of Electrical Engineering (Purdue and Arizona State), in 1998 he moved to industry to participate in the rapid development of digital wireles...
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Articles

Rolling Shutter on a Planetary Scale

Rolling Shutter on a Planetary Scale

HiRise, the High-Resolution Imaging Science Experiment, is a camera on the Mars Reconnaissance Orbiter (MRO). HiRise is a project of the University of Arizona’s Lunar and Planetary Laboratory, LPL, in Tucson, AZ. The mission is to photograph the surface of Mars in...

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Noise, ISO and Dynamic Range Explained

Noise, ISO and Dynamic Range Explained

This article examines the noise characteristics of a modern digital camera. The primary spec used to specify the noise performance of a camera is Dynamic range (DR). Most expositions on DR tend to get highly technical very quickly. OK, this article gets technical here...

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A Better Histogram

A Better Histogram

The photo-histogram is probably the most ubiquitous exposure tool in digital photography; that is, short light metering itself.  It has been with us more than 25 years, and it hasn’t changed much.  The histograms we are familiar with are calculated from transformed...

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  • John Sadowsky
    John Sadowsky
    Silver Member
    Posts: 164
    M1-iMacs – what’s next for us?
    on: May 14, 2021 at 6:51 pm

    I reluctantly bought a M1 MacBook Air, 1TB 16gb ram, it now has completely replaced all my other Macs, I edit 4k video on and work with hasselblad raw files, LR, Phocus, PS, it does everything faster then a high end iMac or MacBook Pro. at less then 1/2 of the price.

    Wow!  I’m not going to be in the market for a new computer for a couple of years – but I’m salivating!

    JSS

    John Sadowsky
    John Sadowsky
    Silver Member
    Posts: 164
    Re: Are these still true?
    Reply #1 on: May 13, 2021 at 6:30 pm

    I think my post got covered in the rubble!

    Sorry about that.  🙁

    I suspect there is a difference between optical stabilization and IBIS on the tripod issue.  I don’t have much experience with optical stabilization, other than my Sony 100-400, but that is a recent lens.  The thrust of my post was that things that may have been true in the past, may not be true today.  Technology just keeps getting better.

    In this video, Chelsea Northup points out that tripods are not always 100% stable, depending on conditions, and so image stabilization can be useful even on a tripod.  I scanned a few other posts and found another one that makes the same point: “First off, let’s be clear — any discussion about Image Stabilization on a tripod refers ONLY to a truly rock-solid tripod.”  So that adds an additional dimension to this issue – even on a tripod stabilization can be useful.

    There may be a difference for 3rd party lenses.  My experience with optical stabilization restricted to my Sony 100-400 on my Sony A7R3.  Supposedly the optical and A7R3 IBIS work together.  Well, we can only expect that to happen well if the lens and body are from the same manufacturer.

    JSS

    John Sadowsky
    John Sadowsky
    Silver Member
    Posts: 164
    Re: Are these still true?
    Reply #2 on: May 13, 2021 at 9:54 am

    John and Andrew: this must stop, and stop immediately.

    Jeremy is right.  This thread has spun out of control.  Reading through it is see that both Andrew and I have misinterpreted each other’s posts, and for my part in this, I express my apology to Andrew and the PhotoPXL community.

    JSS

    John Sadowsky
    John Sadowsky
    Silver Member
    Posts: 164
    Re: Are these still true?
    Reply #3 on: May 11, 2021 at 9:32 pm

    Post consisting entirely of personal abuse deleted by moderator.

    JSS

    John Sadowsky
    John Sadowsky
    Silver Member
    Posts: 164
    Re: Are these still true?
    Reply #4 on: May 11, 2021 at 8:43 pm

    Not that Olympus (and other camera manufacturers) know John:

    Where did I say anything about formatting a card in another device (a computer or other camera).  Of course, you format your mem0ry cards in your the camera it will be used in.  That said, obviously, there are industry standards and it is highly likely that memory cards formatted in different cameras will work just fine.

    Don’t tell us this has “NOTHING to do with engineering” – fool!

    JSS