dennishancock

Lives in United States United States
Joined on Jan 24, 2004

Comments

Total: 54, showing: 1 – 20
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On article Flat metalenses now work with a range of colors (43 comments in total)
In reply to:

BobT3218: It's about time. Considering the sophistication of the rest of the modern camera, it makes no sense that the front end is still reliant on heavy chunks of glass that are in principle little different to those used by the Assyrians in 750BC. There has got to be a better way to bend light.

VR/AR near eye optics are made greatly more comfortable using flat, light-weight lenses implemented as Huygens metasurfaces. The 'old glass' approach is too bulky and heavy. That's one reason to use something else.

Link | Posted on Feb 11, 2017 at 00:00 UTC
On article Flat metalenses now work with a range of colors (43 comments in total)
In reply to:

BobT3218: It's about time. Considering the sophistication of the rest of the modern camera, it makes no sense that the front end is still reliant on heavy chunks of glass that are in principle little different to those used by the Assyrians in 750BC. There has got to be a better way to bend light.

There are four known ways to science to bend light: refraction, reflection, diffraction, and gravitation. The one reported here on Huygens metasurfaces relies on diffraction.

Link | Posted on Feb 9, 2017 at 20:34 UTC
In reply to:

(unknown member): How many people reading this think it means speed and not just depth of field?
On APS: "With an equivalent focal length of 136mm and an equivalent aperture of F2.2"
But feel free to expose as if it was f/2.2, you'll have every shot overexposed by more than a stop.

Also, If you choose an 85mm lens and 1/125 @ f/1.4 @ ISO100 on an FF camera you will get same photo as with an APS-C camera assuming: 1) you stand at the same object distance, 2) the illumination is the same, and 3) the pixel size of each sensor is the same, and 4) the metering functions work identically. The field of view will nominally by 1.5 times larger in x and y and the depth of field will be the same. When you want to know why this is true, read an optics book.

Link | Posted on Feb 9, 2017 at 17:57 UTC
In reply to:

(unknown member): How many people reading this think it means speed and not just depth of field?
On APS: "With an equivalent focal length of 136mm and an equivalent aperture of F2.2"
But feel free to expose as if it was f/2.2, you'll have every shot overexposed by more than a stop.

... and aperture by the way. How to end this display of optics ignorance by those who glibly state focal length is affected by sensor size? It may be so ingrained as to be hopeless except for those who truly want to know how things work.

Link | Posted on Feb 9, 2017 at 02:25 UTC
On article Readers' Choice Awards 2016: the winners (49 comments in total)

D500 looks great. But still holding out for the dual XQD card option.

Link | Posted on Jan 5, 2017 at 22:10 UTC as 6th comment
On article Our favorite gear, rewarded: DPReview Awards 2016 (271 comments in total)
In reply to:

EdnaBambrick: For the millionth time, there is no 1.5x focal length increase. Any gains from smaller sensors ONLY come from pixel size and pixel density.

https://www.dpreview.com/articles/8938321250/dpreview-products-of-the-year-2016?slide=25

"What the E-M1 II is for mirrorless ILCs, the D500 is for DSLRs. Although it lacks a really credible 4K video mode, the D500 is nevertheless an impressive all-rounder, combining some of the best elements of the flagship Nikon D5 with a (relatively) compact APS-C form factor, and a 1.5X focal length increase which is extremely handy for sports and wildlife photography."

For the truly clueless wanting the longest
focal length lens, buy a camera with a 1 pixel sensor. Yea. That will do it.

Link | Posted on Dec 26, 2016 at 16:02 UTC
On article Gear of the Year 2016 - Barney's choice: Nikon D500 (217 comments in total)

Great camera. Personally I'd like to see an option for dual XQD cards just like its big brother the D5. Fewer parts to carry around.

Link | Posted on Dec 19, 2016 at 22:29 UTC as 15th comment | 1 reply
On article Sigma releases price and availability for sd Quattro H (370 comments in total)

Does anyone know if Foveon has improved their low light level and color fidelity issues from earlier offerings?

Link | Posted on Dec 15, 2016 at 19:14 UTC as 23rd comment
On article LensRentals tests the Nikon 70-200mm F2.8 FL ED (111 comments in total)
In reply to:

livelong: disappointing price. For $3000 dollars I can buy a car.

Will it have focus breathing?

Link | Posted on Nov 23, 2016 at 01:26 UTC
In reply to:

evilmagicnut: As a measure to stem the tide of ever increasing prices can I lobby dpreview to stop coverage on lenses that exceed $2000 msrp?

Censorship!

Link | Posted on Oct 21, 2016 at 20:27 UTC
On article Under pressure: Canon vs. Nikon in a hydraulic press (286 comments in total)

Don't give these people the vote.

Link | Posted on Jul 7, 2016 at 20:22 UTC as 108th comment
On article Photographing fireworks: The basics and then some (57 comments in total)
In reply to:

sherman_levine: For my FZ1000, the ISO 100 / Raw / Bulb / F:8(the narrowest FZ1000 aperture) combination washes out too many of the brighter trails. I find that adding a 3-5 stop ND filter gives me much more latitude for color recovery

https://www.flickr.com/photos/32989985@N07/albums/72157655173515689

https://www.flickr.com/photos/32989985@N07/albums/72157646671694507

Sherm

Nice shots. And good to see properly exposed fireworks that capture color correctly.

Link | Posted on Jul 3, 2016 at 13:32 UTC
On article Back to the action: Nikon D500 Review (1139 comments in total)
In reply to:

Satyaa: The reviewers are clearly impressed!
Even when the negatives are mentioned, it doesn't sound anything like a complaint :)

The one negative point (in my opinion) that was not mentioned (or I did not notice) is two different card formats.

Given the build quality, processor + AF from top-of-the-line D5, and insane buffer, why is this categorized as 'semi-professional'?

By its design and capabilities, it should be categorized as professional, whatever its sensor size. And many 'semi-professionals' have complained about the difficulty of using banks as opposed to U1/U2/U3. That doesn't seem to bother the pros.

I am sure that this will become at least the second camera of all the sports/wildlife shooters, if not the primary for many. It does have significant size/weight/price advantage over D500, plus the ability under flickering lights.

A very good review.
Thanks.

I'm with you, Satyaa. The D500 needs to be sold with dual SD card slots or dual XQD card slots as an option like the D5. Why carry around a pocket full of different cards? Hope Nikon marketing is listening.

Link | Posted on May 25, 2016 at 23:13 UTC
On article Heavenly bodies: Nikon D810 & D810A field test (111 comments in total)

Nice job!

Link | Posted on May 11, 2016 at 17:47 UTC as 53rd comment
On article Making a splash: Nikon D500 real-world sample gallery (225 comments in total)

Nikon needs to offer the option of dual XQD cards or dual SD cards for the D500.

Link | Posted on May 3, 2016 at 20:27 UTC as 37th comment
In reply to:

dennishancock: Regardless, the D500 needs either the dual SD card or dual XQD card option.

Yes, both card slots with the same technology. Just like the D5.

Link | Posted on Apr 27, 2016 at 01:16 UTC

Regardless, the D500 needs either the dual SD card or dual XQD card option.

Link | Posted on Apr 26, 2016 at 22:41 UTC as 76th comment | 5 replies

I'm for the same card type option in both slots of the D500, just like the D5. This is the market speaking, Nikon.

Link | Posted on Mar 28, 2016 at 20:08 UTC as 35th comment | 1 reply

Love DxO.

Link | Posted on Mar 17, 2016 at 23:08 UTC as 3rd comment

Speaking of low dynamic range output displays reminds me of prints on paper.

Link | Posted on Mar 16, 2016 at 17:44 UTC as 45th comment
Total: 54, showing: 1 – 20
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