Cheng Bao

Lives in United States United States
Joined on Oct 3, 2003

Comments

Total: 336, showing: 1 – 20
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"The performance of the 1.48x (35mm equivalent) high-magnification"

typo I believe, it should be The performance of the 1.48x (0.76x in 35mm equivalent) high-magnification

Link | Posted on Sep 19, 2016 at 19:42 UTC as 68th comment | 1 reply
On article Lenovo Yoga Book features unique 'on-demand' keyboard (90 comments in total)

It is nice to have OS options for windows and android, it would be nicer if we can "dual boot", that we can choose OS from same device.

Link | Posted on Sep 2, 2016 at 17:28 UTC as 29th comment | 2 replies
On article Lenovo Yoga Book features unique 'on-demand' keyboard (90 comments in total)

pointless "feature"

If I want to draw something "on screen", why not directly draw them "on screen"?

Lenovo gives up physical keyboard's force feed back, retains bulky and weight and more cost as a physical keyboard to achieve a pointless goal?

Link | Posted on Sep 2, 2016 at 17:26 UTC as 30th comment
In reply to:

Cameracist: "5-axis electronic video stabilisation"
...how is that even possible? O.O

If you can do x+y by math, you can do yaw + roll + pitch.
If x is (1,1) to (2,1), (1000,1000) to (1001,1000),
Yaw is (1,1) to (2,1), (1000,1000) to (999,1000)
Roll is (1,1) to (2,0), (1000,1000) to (999,1001)
It is video IS , you have a lot of redundant pixels to deal with.

Link | Posted on Sep 2, 2016 at 03:38 UTC

" By positioning a contrast-detection AF sensor with superior focusing accuracy and a phase-matching AF sensor on the image sensor's surface,"
Very vague statement. It sounds like it is a revolutionary design that features 2 standalone AF sensors somehow at same place as imaging sensor.
Yet the Japanese site indicate this just ordinary on sensor pdaf pixels.

Link | Posted on Jun 9, 2016 at 13:05 UTC as 46th comment
On article Setting new standards: Nikon D5 Review (507 comments in total)
In reply to:

mr.izo: d5 look lik a fine camera, no doubt, but what is happening here:
http://shrani.si/f/h/q/2e6IIAEw/dr.jpg

nikon downgrading its famous dr latitude, while canon is significantly better?

Well, D3x was a flagship body, and have best DR at its age, and still better than most of canon body (maybe still better than 1D X II) with 13.7EV DXO measured DR.

Link | Posted on Jun 1, 2016 at 23:02 UTC
On article Setting new standards: Nikon D5 Review (507 comments in total)
In reply to:

mr.izo: d5 look lik a fine camera, no doubt, but what is happening here:
http://shrani.si/f/h/q/2e6IIAEw/dr.jpg

nikon downgrading its famous dr latitude, while canon is significantly better?

http://www.dpreview.com/reviews/image-comparison/fullscreen?attr144_0=nikon_d5&attr144_1=canon_eos1dxii&attr144_2=pentax_k1&attr144_3=nikon_d750&attr146_0=100_6&attr146_1=100_6&attr146_2=100_6&attr146_3=100_6&attr177_2=off&normalization=compare&widget=333&x=-0.7548638132295721&y=-0.5449885163068443

Link | Posted on Jun 1, 2016 at 20:11 UTC
On article Lens shootout: Sony RX10 III destroys the competition (488 comments in total)
In reply to:

CaPi: Uhm. Need a little help here:
I switch the comparsion tool to 400mm and choose the FZ1000 as comparsion partner: I get shown pictures in wich the SONY cant seem to show one straight (eg. window sill of a house) line as a straight line. Its all wavy and bent. Please verify. Should this be true the praise on the new camera should be ..
well you'd know what to do.

This one is more clear
http://www.dpreview.com/reviews/image-comparison/fullscreen?attr234_0=sony_dscrx10iii&attr234_1=panasonic_dmcfz1000&attr236_0=3&attr236_1=3&attr237_0=5&attr237_1=5&normalization=full&widget=359&x=0.3569571676157466&y=0.856808017231962

You can see, the scale of heat distortion is about same size of the bricks on the wall and the tiles on the roof.

While fz1000 failed to pick up the details of bricks and tiles, of course it failed to pick up heat distortions

Link | Posted on May 26, 2016 at 17:27 UTC
In reply to:

Richard Murdey: 'serious issues with the integrated circuit for image processing'

Unusually blunt and specific language for a company to use. Must have been pretty catastrophic.

But why? They use these ICs all the time, you'd think it was completely known quantity by now.

IC for image processing, isn't image processor, which nikon claimed its own?

Link | Posted on Apr 21, 2016 at 03:36 UTC
On article Huawei launches P9 and P9 Plus with Leica dual-camera (72 comments in total)

No red dot? No buy

Link | Posted on Apr 6, 2016 at 17:23 UTC as 21st comment | 1 reply

Why two name?
I didn't realize NA has number preference of 85 over 80

Link | Posted on Apr 5, 2016 at 15:35 UTC as 14th comment | 1 reply
On article Power Zoom: Panasonic Lumix DMC-ZS100/TZ100 Review (338 comments in total)
In reply to:

NJOceanView: The Test Scene shows a strong consistency in mage quality between this camera and the now rather ancient first generation Sony RX100. Meanwhile the RX100 (III), which is still one generation back, runs circles around this camera on the Test Scene comparison. So I'm not sure where the strong image quality ratings are coming from.

Note that I appreciate that the camera has significant additional value beyond the RX100 because of its zoom. But IQ to IQ, there's no comparison.

Well, given the relative compact package and relative longer zoom range, it is a calculated trade-off.

I am certain both cameras you mentioned will find their places.

Link | Posted on Apr 4, 2016 at 20:38 UTC
In reply to:

Becksvart: Re: AF wide open then stop down when taking shot, like A-mount AF lenses.

If i turn Live view effects off then my PZ 18-105 will AF wide open and stop down to selected aperture when focus is acquired. If on then it will stop down when I stop down the aperture and then AF half-open, or one or two stops from wide open anyways, and then stop down to the selected aperture when focus is acquired. This is the same with the 20/2,8.

Are more expensive FE lenses different?

Hi, please raise that issue direct to sony, I believe dpr has a direct channel to manufactures, right?

Link | Posted on Apr 1, 2016 at 23:43 UTC
In reply to:

rrccad: what's the 20 lenses?
I count 16..
is dpreview using sony "math" and counting teleconvertors and wide angle adapters as "lenses"?

http://www.sony.com/electronics/lenses/t/camera-lenses?cameramount=e-mount&sensor-lens=35mm-full-frame

16 lenses listed excluding TC

Link | Posted on Apr 1, 2016 at 23:37 UTC
In reply to:

rrccad: what's the 20 lenses?
I count 16..
is dpreview using sony "math" and counting teleconvertors and wide angle adapters as "lenses"?

Loxia don't count because there are not sony branded

Link | Posted on Apr 1, 2016 at 22:04 UTC
In reply to:

rrccad: what's the 20 lenses?
I count 16..
is dpreview using sony "math" and counting teleconvertors and wide angle adapters as "lenses"?

So 16 is correct math

Link | Posted on Apr 1, 2016 at 21:55 UTC
In reply to:

rrccad: what's the 20 lenses?
I count 16..
is dpreview using sony "math" and counting teleconvertors and wide angle adapters as "lenses"?

1. FE28-70
2. FE 24-70
3. FE 55 1.8
4. FE 35 2.8
5. FE 70-200/4
6. FE 16-35/4
7. FE 28-105
8. FE 28/2
9. SEL075UWC
10. SEL057FEC
11. FE 35/1.4
12 FE 90/2.8
13 FE 24-240
14 24-70/2.8
15 80/1.4
16 70-200/2.8
17 FE 50/.18
18 FE 70-300G
19 1.4x TC
20 2.0x TC

And yes, sony do count converters as lenses, as seen in their road maps

Link | Posted on Apr 1, 2016 at 21:49 UTC
In reply to:

SteB: I assume that the 0.49x magnification is a 35mm film (FF) equivalent, because 0.49X magnification on a 1 inch sensor would be super close. Is it a 35mm film equivalent magnification?

It is equivalent.

Link | Posted on Mar 30, 2016 at 20:51 UTC
In reply to:

G1Houston: Finally!.. Hopefully this is the beginning of SONY to build a set of affordable FE prime lenses that are good enough for the mass. There is already an affordable 28mm lens, so if SONY can make an affordable 85/1.8, we will then have an affordable 3-prime set that makes the whole A7 package small and relatively inexpensive. When that happens it will be the beginning for the SONY FE mount to begin to chip away from current dSLR FF offerings. Finally.

I have sony 85 f2.8 for only $350,
But if sony give me 85/1.8 for $500, which size and weight similar to c/n's offering, I will still take it over 85/2.8.
There are many time I dream I could have 1 stop faster shutter speed.

Upgrading AF performance will be big plus, since 85/2.8 is painfully slow.

Link | Posted on Mar 29, 2016 at 23:11 UTC
Total: 336, showing: 1 – 20
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