Jim Kaye

Jim Kaye

Lives in United States United States
Joined on Jul 29, 2003

Comments

Total: 7, showing: 1 – 7
On Nikon releases ViewNX-i image browsing software article (102 comments in total)

Hangs for minutes with spinning beach ball on my MacBook Pro, 8 GB RAM, running Yosemite 10.10.2. After force close, same problem on trying to reopen it. Uninstalled it and put NX2 back -- Nikon has to do better than this.

Direct link | Posted on Mar 19, 2015 at 00:12 UTC as 20th comment | 1 reply
On Nikon D750 Review preview (1914 comments in total)
In reply to:

Jim Kaye: The description of the one-direction AF sensors as "horizontally sensitive" is a bit misleading. With the camera in landscape mode (as in the video posted in the review showing low-light focusing), a peripheral sensor fails to focus on a vertical line. Isn't this because it is actually "vertically sensitive" (meaning that it detects contrast along a vertical line)? Since a vertical white line on a black background doesn't present much contrast in this direction, the sensor doesn't see it. There is lots of horizontal contrast, though (black on the left of the vertical line, then the white line itself, then black again to the right of the line). By "horizontally sensitive" I imagine the reviewer means that the sensor "sees" horizontal (but not vertical) lines. But the sensor itself must be oriented vertically with the camera in this orientation, so I would call it "vertically sensitive." Or am I missing something?

Actually the detail (contrast) has to be along a vertical vector (shooting with the camera in landscape orientation, as described in the review), but yes, you're right, of course it doesn't have to be perfectly vertically oriented detail (I.e., if it's a line, the line doesn't have to be perfectly horizontal).

Direct link | Posted on Dec 25, 2014 at 05:42 UTC
On Nikon D750 Review preview (1914 comments in total)
In reply to:

Jim Kaye: The description of the one-direction AF sensors as "horizontally sensitive" is a bit misleading. With the camera in landscape mode (as in the video posted in the review showing low-light focusing), a peripheral sensor fails to focus on a vertical line. Isn't this because it is actually "vertically sensitive" (meaning that it detects contrast along a vertical line)? Since a vertical white line on a black background doesn't present much contrast in this direction, the sensor doesn't see it. There is lots of horizontal contrast, though (black on the left of the vertical line, then the white line itself, then black again to the right of the line). By "horizontally sensitive" I imagine the reviewer means that the sensor "sees" horizontal (but not vertical) lines. But the sensor itself must be oriented vertically with the camera in this orientation, so I would call it "vertically sensitive." Or am I missing something?

Thanks for the reply, Rishi! Yes, my post was wordy, but the ambiguity I was pointing out is really no more complicated than what arises when explaining, for example, "equivalent FL" on one sensor format vs another: to be clear, one has to use at least two words to express two concepts, e.g., a "50 mm lens on m4/3" is equivalent (in its angle of view) to a "100 mm lens on FX." Similarly (with the camera in landscape orientation) the peripheral D750 sensors are sensitive to "horizontal lines" or, equivalently, to "vertical contrast." Either "horizontal-line sensitive" or "vertical contrast sensitive" would be an adequate description. For gear heads the latter is probably preferable because it better describes the orientation of the physical AF sensor, but for photographers, I agree, your choicer is more descriptive since it relates more closely to what the simplest effective autofocus target looks like.

Excellent review overall, BTW -- thanks for all the effort!

Direct link | Posted on Dec 23, 2014 at 15:33 UTC
On Nikon D750 Review preview (1914 comments in total)

The description of the one-direction AF sensors as "horizontally sensitive" is a bit misleading. With the camera in landscape mode (as in the video posted in the review showing low-light focusing), a peripheral sensor fails to focus on a vertical line. Isn't this because it is actually "vertically sensitive" (meaning that it detects contrast along a vertical line)? Since a vertical white line on a black background doesn't present much contrast in this direction, the sensor doesn't see it. There is lots of horizontal contrast, though (black on the left of the vertical line, then the white line itself, then black again to the right of the line). By "horizontally sensitive" I imagine the reviewer means that the sensor "sees" horizontal (but not vertical) lines. But the sensor itself must be oriented vertically with the camera in this orientation, so I would call it "vertically sensitive." Or am I missing something?

Direct link | Posted on Dec 20, 2014 at 19:39 UTC as 356th comment | 6 replies
On Nikon D810: A sport photographer's impressions article (253 comments in total)
In reply to:

michael2011: "And yes, the D810 is waterproof."

I seriously doubt it. Is this Nikon's claim or just the author's opinion?

Thanks for an interesting and informative post, as well as your thoughtful responses to many of the comments and questions.

Direct link | Posted on Aug 13, 2014 at 14:36 UTC
On P1030193 photo in dpreview review samples's photo gallery (2 comments in total)

Awfully good detail and color for ISO 3200 and f/2 -- what a sweet little lens, and this sensor and JPEG engine look terrific.

Direct link | Posted on Oct 11, 2013 at 16:26 UTC as 2nd comment

Many dancers look remarkably tall, even when they aren't, because of the way they carry themselves.

If the assignment had been to create a photo doing everything possible to counteract this tendency, I would give this an A+.

1. Use a wide angle lens and shoot from above waist height to foreshorten the legs.

2. Point one leg toward the camera to make it disappear entirely.

3. Use the dancer's hand to hide her neck.

4. Have her lean forward (again, pointing toward the camera).

5. Put her head against the upper edge of the frame so it looks like she has nowhere to go and is getting crushed.

Direct link | Posted on Mar 11, 2013 at 16:32 UTC as 19th comment | 1 reply
Total: 7, showing: 1 – 7