Mike Davis

Lives in United States Dallas, TX, United States
Has a website at http://www.accessz.com
Joined on Jun 12, 2002

Comments

Total: 112, showing: 1 – 20
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In reply to:

Sdaniella: RED: 40.96mm x 21.60mm (8k dci: 1.8963:1)
46.31 mm image circle
8192x4320=35,389,440 pixels
5.00 um x 5.00 um pixel

... with a typical cine camera MONSTRO cooling system ...
without which, it would not maintain either such "great" DR or IQ ... and over long periods of uncooled operation choke on its own heat ... and cpus would all quickly crash

... try achieving 8k dci 17+ DR with nothing but an unfanned heatsinked sensor in a typical modern consumer palm-sized dcam with video ... in a lightweight compact body

In the end, looking only at the effects of diffraction vs. enlargement factor, viewing distance and desired final image resolution, ignoring differences in dynamic range, color accuracy, SNR at various ISO settings and price, the D850 needs faster lenses to enjoy as a great a range of viable f-stops. Going to densities higher than 230 on a fullframe sensor would further restrict the range of viable f-stops.

Link | Posted on Oct 8, 2017 at 13:43 UTC
In reply to:

Sdaniella: RED: 40.96mm x 21.60mm (8k dci: 1.8963:1)
46.31 mm image circle
8192x4320=35,389,440 pixels
5.00 um x 5.00 um pixel

... with a typical cine camera MONSTRO cooling system ...
without which, it would not maintain either such "great" DR or IQ ... and over long periods of uncooled operation choke on its own heat ... and cpus would all quickly crash

... try achieving 8k dci 17+ DR with nothing but an unfanned heatsinked sensor in a typical modern consumer palm-sized dcam with video ... in a lightweight compact body

Phase One IQ1 50 / IQ2 50 / IQ3 50 _ Pixel Density = 188/mm
Hasselblad X1D _ Pixel Density = 188/mm
FujiFilm GFX 50S _ Pixel Density = 188/mm
Pentax 645Z _ Pixel Density = 188/mm
Hasselblad H3DII-50 Pixel Density = 167/mm
Leica S2 / 10803 S (Typ 006) _ Pixel Density = 167/mm
Pentax K-1_ Pixel Density = 205/mm

Nikon D850 _ Pixel Density = 230/mm

230 is to 200 as never stopping down below f/9.1 is to f/10.5, to deliver 5 lp/mm in an uncropped, uresampled, 360 ppi print.

Link | Posted on Oct 8, 2017 at 13:43 UTC
In reply to:

Sdaniella: RED: 40.96mm x 21.60mm (8k dci: 1.8963:1)
46.31 mm image circle
8192x4320=35,389,440 pixels
5.00 um x 5.00 um pixel

... with a typical cine camera MONSTRO cooling system ...
without which, it would not maintain either such "great" DR or IQ ... and over long periods of uncooled operation choke on its own heat ... and cpus would all quickly crash

... try achieving 8k dci 17+ DR with nothing but an unfanned heatsinked sensor in a typical modern consumer palm-sized dcam with video ... in a lightweight compact body

8192x4320 on a 40.96x21.6mm sensor works out to exactly 200 pixels/mm.

Yet again, 200 pixels/mm appears to be a line in the sand that the best sensors do not cross or, if so, by very little. Higher pixel counts are needed to satisfy higher resolution goals at greater enlargement factors without having to shoot wide open with fast lenses, because diffraction is always there saying, "Keep those sensors large, with a pixel density at or below 200 pixels/mm, or I will lay waste to your high pixel count if you try to stop down."

Phase One XF 100MP / IQ1 100 / IQ3 100 _ Pixel density = 216/mm
Phase One IQ1 80 / IQ2 80 / IQ3 80 _ Pixel density = 192/mm
Leaf Credo 80 _ Pixel Density = 192/mm
Phase One P65+ Back _ Pixel Density = 165/mm
Leaf Credo 60 _ Pixel Density = 167/mm
Phase One IQ1 60 / IQ2 60 / IQ2 60MP Achromatic _ Pixel Density = 167/mm
Hasselblad H4D-60 / H5D-60 _ Pixel Density = 167/mm
Leaf Afi-II 10 or Aptus-II 10 Pixel Density = 166/mm

Link | Posted on Oct 8, 2017 at 13:42 UTC
In reply to:

milkod2001: Some of them are just too perfect. computer renders?

The photos of Saturn look perfect because man hasn't set foot on it yet to mess it up.

Link | Posted on Sep 17, 2017 at 22:43 UTC

What short memories we have. Reversal processing is as old as the hills. My hat's off to anyone who goes to the effort of perfecting this on their own, especially these days, but for anyone less energetic, you can send your unprocessed B&W negatives to http://www.dr5.com/blackandwhiteslide/dr5chrome.html. (I'm not affiliated.)

Link | Posted on Aug 30, 2017 at 17:42 UTC as 10th comment | 3 replies
In reply to:

desmond2046: I'm surprised that they used DJI drones to begin with

... or anything manufactured in any part of the globe where fictional Boogeymen have been crafted to instill fear in the minds of the American sheeple. Am I getting off-topic? :-)

Link | Posted on Aug 4, 2017 at 19:18 UTC

She's probably a test subject for one of Elon Musk's Neuralink AI augmentation processors.

Link | Posted on Jul 24, 2017 at 23:48 UTC as 27th comment

Reminds me of the Zuiko 50mm F2 Macro - a very similar design - you can pick it up used, for about $80. No contest, though. I would think the Voigtlander is more capable on several counts (not to mention offering a greater working distance.)

Link | Posted on Jul 24, 2017 at 23:40 UTC as 44th comment | 1 reply

So much effort would be required to make just one exposure - orders of magnitude more difficult than a terrestrial 8x10 - except for fixed focus and no movements. This thing is a solution looking for a problem.

Link | Posted on Jul 21, 2017 at 16:44 UTC as 8th comment | 5 replies
In reply to:

Mike Davis: With this device I can turn my Sony a6000 into an iPhone camera with a good sensor and interchangeable lenses, but... There goes the challenge AND fun of making creative and technical decisions myself. In other words, I will no longer be a photographer.

You're right - a chimpanzee can't be a neurosurgeon, but he can certainly take pictures with an Arsenal-equipped DSLR.

Link | Posted on Jun 1, 2017 at 11:32 UTC
On article Google will no longer develop Nik Collection (392 comments in total)
In reply to:

tkbslc: Google has no interest in the Desktop. That's why they killed PIcasa, too. And why they made a whole operating system for cloud only. They want all your data on their servers where it can be mined and used for either advertising or to develop additional technologies.

So astute!

Link | Posted on May 31, 2017 at 09:20 UTC
On article Google will no longer develop Nik Collection (392 comments in total)
In reply to:

Miike Dougherty: Does anyone know of a substitute plugin for Vivesa 2?

Unfortunately, no. I LOVE Viveza.

Link | Posted on May 31, 2017 at 09:17 UTC
On article The DJI Spark is a $500 HD mini drone (96 comments in total)
In reply to:

Mike Davis: Interesting specs:

"Despite its small footprint, Spark can fly up to 50 kph, offers a 100 m range (when controlled by a smart device) and has a 16 min flight time."

At 50 kph, it would fly beyond its 100 m WiFi range in 7.2 seconds, but will likely consume a good portion of its maximum range, just accelerating to its maximum speed from a hover.

Update: If you started from a hover at the edge of its 100 m range, you could fly it across your position to a point on the opposite side of a 200 m circle. Now I'm thinking it might actually be capable of 50 kph, in that scenario.

Thanks for the info, guys.

Link | Posted on May 31, 2017 at 09:15 UTC
In reply to:

Mike Davis: With this device I can turn my Sony a6000 into an iPhone camera with a good sensor and interchangeable lenses, but... There goes the challenge AND fun of making creative and technical decisions myself. In other words, I will no longer be a photographer.

Given the comments found on the "Most popular (15)" tab, your use of the phrase "you all" is appropriate.

Link | Posted on May 31, 2017 at 09:14 UTC
On article The DJI Spark is a $500 HD mini drone (96 comments in total)

Interesting specs:

"Despite its small footprint, Spark can fly up to 50 kph, offers a 100 m range (when controlled by a smart device) and has a 16 min flight time."

At 50 kph, it would fly beyond its 100 m WiFi range in 7.2 seconds, but will likely consume a good portion of its maximum range, just accelerating to its maximum speed from a hover.

Update: If you started from a hover at the edge of its 100 m range, you could fly it across your position to a point on the opposite side of a 200 m circle. Now I'm thinking it might actually be capable of 50 kph, in that scenario.

Link | Posted on May 28, 2017 at 13:58 UTC as 4th comment | 4 replies

With this device I can turn my Sony a6000 into an iPhone camera with a good sensor and interchangeable lenses, but... There goes the challenge AND fun of making creative and technical decisions myself. In other words, I will no longer be a photographer.

Link | Posted on May 28, 2017 at 13:35 UTC as 26th comment | 4 replies
In reply to:

Peter von Reichenberg: GFX 50 + Zeiss Otus trio? Killing set.

And besides, a passerby who sees you shooting with an MF body will be much more impressed than with a FF DSLR. Who cares what lens is mounted as long as it's big? Swag wins the day.
/sarc/

Link | Posted on May 25, 2017 at 19:20 UTC
On article A Taste of New York is a stunning Big Apple time-lapse (89 comments in total)

This is immensely entertaining. The sound effects are superb! Anyone who has only heard it with their craptop speakers should have another go with at least a cheap pair of headphones.

Link | Posted on May 21, 2017 at 10:11 UTC as 11th comment
On photo August Bronze in the Tilt Shift challenge (1 comment in total)

Hi PanoMax,

There's no accounting for my poor taste (relative to the rest of the world), but I find your "traditional" use of Tilt/Shift to be wonderfully refreshing among the 19 out of 20 submissions for this challenge that pursued the trendy but oh so gimmicky "miniature effect."

Considering that 14 submissions bested your image in garnering votes, I am no doubt aligned with a minority in considering your image to be the very best of this competition.

Thanks for reminding everyone that movements are good for more than the tiresome "miniature effect" - and doing it with an 8x10 view camera, no less.

Link | Posted on May 15, 2017 at 01:43 UTC as 1st comment
In reply to:

Josh Leavitt: I'm terrified to think about how much the lenses will cost that can sharply resolve 150MP across their full aperture range. Pretty awesome nonetheless, though.

@mosc Excellent - your hunch matches my math, exactly.

100 MP (11545x8659 pixels) from a 44x33mm sensor gives us a pixel density of 262.4 pixels/mm, which translates to a maximum f-Number of f/8.0 to prevent diffraction from inhibiting a desired print resolution of 5 lp/mm at the enlargement factor had when resizing the image to 360 ppi without cropping or resampling. (Reduce your desired print resolution by a factor of two, to 2.5 lp/mm. and you can shoot at f/16.)

150 MP (14140x10605 pixels) from a 55x41mm sensor gives us a pixel density of 257.7 pixels/mm, which translates to a maximum f-Number of f/8.1 to prevent diffraction from inhibiting a desired print resolution of 5 lp/mm at the enlargement factor had when resizing the image to 360 ppi without cropping or resampling. (Reduce your desired print resolution by a factor of two, to 2.5 lp/mm. and you can shoot at f/16.2.)

Link | Posted on Apr 3, 2017 at 21:22 UTC
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