Joseph S Wisniewski

Lives in United States Detroit, MI, United States
Works as a Speech and sensor scientist
Has a website at http://www.swissarmyfork.com
Joined on Jul 12, 2002
About me:

I've been in love with photography for over 40 years.

My favorite form of photography is macro, and much of my gear is of my own design.

I've done professional photography on and off for over 20 years.
Taught 8 years at Midwest Photography Workshops.
Designed 3 scientific digital cameras and 6 lenses.

Author of mImage and (coming soon to the App Store and Google Play) ColorForEveryone.

Comments

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You want to "essentially kill off the green screen"?

Use a time-of-flight depth camera like a Kinect 2.

Link | Posted on Apr 24, 2016 at 03:00 UTC as 5th comment
In reply to:

matthiasbasler: To the calculations and assumptions done by dpreview. I agree that this video beast likely has (an needs to have) an excess of resolution in order to give the editor a real choice for focus.

WIth the Lytro Illum you could refocus your image to any point, but there was only a limited range in which the image was anything like sharp. (It had two maxima at depth -4 and +4 with a local minimum at ±0 where the image was just acceptable, but not really good. This left me with no real choice where to put my subjects if I wanted them to be sharp (~-6 to -2 and/or 2 to +6, roughly).
Excess resolution would give me the freedom to re-focus on anything from, lets say, -10 to +10 and still have an acceptable sharpness.

P.S. They Lytro Illum did not have a spatial resolution of 5MP! The spatial resolution is nowhere officially stated (afaik) and the camera can only export rather soft 4MP JPG files, the effective resolution is ~2MP in ideal conditions.

In other words, it will give you enough wiggle room to "clean up" after a focus puller's minor errors. But it can't really refocus anywhere in the scene, simulate rack focusing, etc.

Link | Posted on Apr 24, 2016 at 02:57 UTC
In reply to:

Joseph S Wisniewski: "The multiple perspectives captured mean you can generate 3D images or video from every shot at any desired parallax disparity"

Except that single point cameras are essentially useless for 3D video, because the occlusion is only correct from the single viewpoint. Moving the viewpoint means that you now need background that was blocked from the single viewpoint.

The end result is that the images look like bad automatic 3D conversions, until a skilled artist retouches all occluded areas.

The human interpupillary distance ranges from about 50-70mm, and 3D filmmakers tend to shoot a bit wider. The "correct perspective shift within a limited area" of a lightfield camera is limited by the aperture of the lens. To get a minimal 50mm interpupillary distance on a normal lens would require a 30mm f0.5 on a super-35mm sized sensor.

I stand by my observation that "single point cameras are essentially useless for 3D video" and for 3D work, the lightfield cameras are essentially single points.

Single point techniques only work in macro 3D focus stacking, where the interpupillary distances are on the order of 1mm, not 60mm, and the background is totally out of focus.

Link | Posted on Apr 24, 2016 at 02:51 UTC

"The multiple perspectives captured mean you can generate 3D images or video from every shot at any desired parallax disparity"

Except that single point cameras are essentially useless for 3D video, because the occlusion is only correct from the single viewpoint. Moving the viewpoint means that you now need background that was blocked from the single viewpoint.

The end result is that the images look like bad automatic 3D conversions, until a skilled artist retouches all occluded areas.

Link | Posted on Apr 22, 2016 at 03:55 UTC as 10th comment | 6 replies
On article Hands on with the Hasselblad H6D 50c/100c (260 comments in total)
In reply to:

sean lee: Wow... 100MP.... Unbelievable...
But with that price, I can buy BMW or Audi...
I thought Leica was the most expensive camera...
Wow...

You are mistaken. They got the idea from the same place Blad got it from, Creo Leaf.

Link | Posted on Apr 18, 2016 at 23:31 UTC
On article Hands on with the Hasselblad H6D 50c/100c (260 comments in total)
In reply to:

sean lee: Wow... 100MP.... Unbelievable...
But with that price, I can buy BMW or Audi...
I thought Leica was the most expensive camera...
Wow...

Leica is the most expensive camera. Hasselblad has nothing in platinum, or with diamonds or ostrich skin.

Link | Posted on Apr 17, 2016 at 06:02 UTC
In reply to:

David Hurt: Who in the hack can afford this??

At my peak as a product photographer, no problem.

A lot of high end product, architecture, glamour, wedding, and portrait photographers can afford things like that.

Link | Posted on Apr 8, 2016 at 01:46 UTC
On Connect post iPhone SE is a compact-sized iPhone 6s (184 comments in total)
In reply to:

timo: The right move. Those big phones are hopeless if you want to carry them around in your trouser pocket. The occasions when I really need a larger screen are rare.

I've noticed that the bigger phones, like an iPhone 6s+ or a Galaxy Note 4 actually feel smaller and more comfortable in the pocket than smaller phones.

The small ones always turn sideways, the big ones stay upright. I learned about this paradox shoving my work iPhone 6s+ in my pocket and noting that it actually felt more comfortable than my smaller Galaxy S4. My S7 edge should be arriving soon: I'm hoping it's large enough to feel small.

Link | Posted on Mar 22, 2016 at 03:55 UTC
In reply to:

Lars V: The question on my mind is, does the True Tone technology solve an actual problem, or does it create more problems (comparing two displays next to each other with different automatic whitepoint etc)?
Looking forward to hearing about actual experiences, here and elsewhere.

You've never had the misfortune of owning a phone or tablet with a white bezel. Half my dev phones are white, and it's a bloody nightmare (all my personal devices are a nice, sane black).

Every phone or tablet with a white bezel looks horrible. The bezel reflects the ambient white (2700K, 3200K, and 4300K seem to be popular indoors these days) while the display illuminates at an entirely different white point (for reasons unknown, often slightly warmer than daylight, up around 6000K).

The brain sets its white point somewhere in between (variably, depending on how interested it is in whatever is on the display) and the end result is that the display looks too cool, and the white bezel looks old and yellowed.

If they did this True Tone thing right, the display should match the bezel, and white will be white!

There's more detail in my post above yours.

Link | Posted on Mar 22, 2016 at 03:40 UTC

The "true tone" sensors will do something very important, adjust the display white point to match the environment. It won't really help too much with image viewing or processing, but it will keep white iPads from looking so horrid.

Hopefully, we'll be seeing this on the iPhone 7 soon.

I cringe whenever I have to use a white iPhone, because my lab is about 4300K and the iPhone white point is somewhere around 5800K, and when you concentrate on the display, the bezel looks so dingy yellow, like a piece of 25-year-old plastic.

I've always thought that was the reason Samsung doesn't make white phones or tablets any more.

Link | Posted on Mar 22, 2016 at 03:30 UTC as 34th comment
In reply to:

Old Cameras: I think they watched the Bourne identity series before coming up with these names. Blackstone and firefly sound like black ops.

Ah, Blackstone.

The magician who used to hawk "TV Magic Cards".

Link | Posted on Mar 22, 2016 at 03:23 UTC

A coating that reduces color aberrations?

Link | Posted on Mar 22, 2016 at 03:21 UTC as 23rd comment | 1 reply
In reply to:

Rod McD: Time for some honesty. Flash manufacturers are taking more liberties with naming conventions to market their products..... It only has a GN of 44(m) when used with a 105mm lens. It would be far more useful to know what the GN is when it's used with a normal lens. Flashes usually used to be specified with a 35mm lens (on FF) and a second figure for what ever angle their WA diffuser covered. I'd bet that it's actual GN is more like 27-30 with a 35mm lens. It's not even in the spec sheet on Metz's website.

"Some Germany companies are not liking the old/good Germany anymore."

Metz has had that sort of problems for at least a decade. Icky "popping" blue whites because they left off UV filtering to get an extra 2% of guide number. Ergonomics from hell. I remember helping a friend get a refund on a Metz because the promised adapter didn't come out after a solid year's wait. Then there was the macro flash that they called "ring form". Looked like a ring light, priced like a ring light, but lit like a small, off-axis strobe.

Companies like Metz helped bring down the old German reputation for quality.

Link | Posted on Jan 14, 2016 at 02:19 UTC

An LED instead of RF excitation of the xenon tube.

Congratulations, Metz, for setting technology back a few years.

Link | Posted on Jan 14, 2016 at 02:15 UTC as 2nd comment
In reply to:

Tal Shachar: so the public can't buy the camera because they (Pentax) are afraid we will use infrared to shoot through clothes?

Exactly!

Link | Posted on Dec 9, 2015 at 02:29 UTC
In reply to:

backayonder: Why Pentax think that anyone would buy this camera to shoot nudes is ridiculous. A far far cheaper option is a bunch of flowers and an expensive restaurant. And make sure the other party is agreeable too.

That word doesn't mean what you think it does.

Link | Posted on Dec 9, 2015 at 02:26 UTC
In reply to:

Roland Karlsson: Just to be sure. Have anyone checked that the real reason for Pentax to not sell IR cameras to public is that it is considered a danger to privacy, i.e. that it is see through?

Exactly, Roland.

We call it the "Sony lesson". You remember the crowds of angry mothers smashing and burning Sony video gear because the "x-ray cameras" might see someone's pubic hair through a bathing suit.

Same situation as the IR Fuji cameras, which Fuji only sold through law enforcement distributors.

As far as Sigma, they'd kill to get the same sort of bad publicity that caused such problems for Sony. It's one thing when you have one of the world's most recognized brands, and another when people say "Sigma? They make a camera?"

Link | Posted on Dec 9, 2015 at 02:14 UTC
In reply to:

LJ - Eljot: Can someone describe in wich way the lack of live view makes a camera cheaper?

Obviously, it doesn't make anything cheaper. This is a classic example of "defeaturing" something through software.

Link | Posted on Nov 20, 2015 at 00:55 UTC

Wow, "crippleware" from Leica. Who'd have thought we'd see this day.

Link | Posted on Nov 20, 2015 at 00:52 UTC as 57th comment
In reply to:

Bernard Carns: DJII will now offer a version with wooden propellers, and the Hasselblad logo laser scribed on the wood.

BC

Yep, the Lunar will be joined by the Coptar...

Link | Posted on Nov 7, 2015 at 00:13 UTC
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