Cheng Bao

Cheng Bao

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

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Total: 67, showing: 1 – 20
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On Very flashy: Ricoh unveils Pentax K-S1 DSLR article (145 comments in total)
In reply to:

Ozyxy: I like the Sv and TAv modes, why can't Canon, Nikon and Sony have these modes as well?
K-S1 is so flashy it will be difficult to use it for street photography where we take pictures of people without their consent... at night they'll see the LEDs. However, I find it difficult to use a DSLR at night as I can't see the buttons, so these LEDs might help...

TAv is just auto ISO on M mode, I think nikon has it at least as early as D3, before pentax put TAv mode.

Direct link | Posted on Aug 28, 2014 at 03:05 UTC
On Sony announces Alpha a5100 compact mirrorless camera article (106 comments in total)

"Additionally, with the power of the BIONZ X processor, the camera is able to read, process and output data from all of the sensor’s pixels during video recording, ensuring that it produces the highest quality video possible by eliminating aliasing, moiré and false color artifacts."

I was positive I read this paragraph on this page. Now the paragraph is removed.

However, this paragraph is still on sony's official website http://blog.sony.com/press/sony-debuts-ultra-compact-%CE%B15100-interchangeable-lens-camera-with-impressive-autofocus/

what's going on?

Direct link | Posted on Aug 18, 2014 at 19:35 UTC as 8th comment | 1 reply
On Ricoh expands Q series with Pentax Q-S1 article (352 comments in total)

Very smart move.

Imagine a lady who has dozens of dresses or suits, she need dozens of difference color of her camera to match her dress, then the sales of pentax Q will be tenfold.

Direct link | Posted on Aug 4, 2014 at 23:09 UTC as 73rd comment | 1 reply
On Canon India teases 'something big' coming soon article (150 comments in total)

Canon India already revealed the puzzle

https://www.facebook.com/canonindia/photos/p.798948450135433/798948450135433/?type=1&theater
they reply this on their own something BIG teaser

Direct link | Posted on Aug 1, 2014 at 16:41 UTC as 9th comment | 2 replies
On Canon India teases 'something big' coming soon article (150 comments in total)

So, this is something BIG from canon

"Canon Announces New imagePROGRAF Large Format Printers"
http://www.canonrumors.com/2014/07/canon-announces-new-imageprograf-large-format-printers/

Direct link | Posted on Aug 1, 2014 at 15:33 UTC as 12th comment
On Canon India teases 'something big' coming soon article (150 comments in total)

Who still remember Fujifilm france teaser of
"Announcement of the launch of a vast operation never heard-of in the photography world" back to June 2014?

Direct link | Posted on Jul 31, 2014 at 18:53 UTC as 69th comment

I notice some photos are deliberated dial down exposure for 1.xx stop, then pushed up in acr by 1.xx stop, why?

Direct link | Posted on Jul 30, 2014 at 17:06 UTC as 12th comment | 4 replies

404 page not found if I clicked the link

Direct link | Posted on Jul 30, 2014 at 16:48 UTC as 13th comment | 2 replies
On Nikon 1 V3 First Impressions Review preview (624 comments in total)
In reply to:

Lucas_: It's yet an interesting camera, but I guess it'll need further development to cope with the competition later generation technology, mainly in IQ ( Nikon should just buy the Sony 1" sensor ). Price is definitely another big issue.

@Sonyshine, but aptina sensors itself don't have OSPDAF
https://www.aptina.com/products/image_sensors/ar1411hs/
https://www.aptina.com/products/dslr/ar1011hs/
That means PDAF pixel could be customized.

Another example, EM-1 use a sensor based on panasonic MN34230, which has OSPDAF as revealed by chipworks,
however, MN34230 itself don't have any PDAF pixels
http://www.semicon.panasonic.co.jp/ds4/MN34230PL_E.pdf

Direct link | Posted on Jul 16, 2014 at 15:44 UTC
On Nikon 1 V3 First Impressions Review preview (624 comments in total)
In reply to:

Lucas_: It's yet an interesting camera, but I guess it'll need further development to cope with the competition later generation technology, mainly in IQ ( Nikon should just buy the Sony 1" sensor ). Price is definitely another big issue.

Nor does aptina version has pdaf as shown on its website.
I believe ospdaf can be customized on sensors.

The big different of sony sensor aptina sensor is readout speed, although Sony sensor is capable to out put whole sensor area at 20fps, however, high speed af may need higher fps for certain area. Previous aptina sensor has 700M bps output ability for single lane, while Sony one has only 576M. That could make difference on af speed.

Let's see how fast fz1000 can focus.

Direct link | Posted on Jul 16, 2014 at 15:01 UTC
On Nikon 1 V3 First Impressions Review preview (624 comments in total)
In reply to:

thomasw333: Nice looking camera, but the V series should have the EVF built in. And that chart that they show in the beginning of the review just makes the Sony A6000 seem like the best to me. But if you like Nikon, I thought the J3 had good IQ so this V3 should be better and a decent camera.

Native nex lense is so so, however, if the critics is coming from nikon 1 camp, hmm...

standard zoom, check
3x 70-200 range zoom check
7x 28-300 range zoom check
wide angle zoom, nex has 15-27mm, 1 got only 18-35
nex has standard zoom start at 24mm, 1 got only 27mm

for fixed focal lense
sony has 24, 35, 40, 45, 50, 75, 85
while 1 only have 28, 50, 85
further more, nex has much larger equivalent aperture, with only exception is 32/1.2, which has F3.2 EA, the counter part 55/1.8, which is F2.7 EA.

The only lense that sony lack of native support is 70-300mm, but consider the size/weight/price, sony 70-300G for full frame has same size/weight/price, although it is not E native.

Direct link | Posted on Jul 15, 2014 at 23:52 UTC
On Nikon 1 V3 First Impressions Review preview (624 comments in total)

page 11, no primary camera is selected in studio comparison tools.
And the reason is v3 is not in drop down list

Direct link | Posted on Jul 15, 2014 at 22:39 UTC as 158th comment | 1 reply
On Ricoh announces Pentax XG-1 superzoom article (195 comments in total)

The interesting part is this camera's brand name.

Ricoh has dropped pentax brand on its fixed-lense digicam line, updates of old pentax wg line all bear ricoh name now.

Now this one use pentax brand again.

Direct link | Posted on Jul 15, 2014 at 16:12 UTC as 19th comment | 3 replies
On What is equivalence and why should I care? article (2004 comments in total)
In reply to:

Erick L: Total light on sensor affecting noise doesn't make sense to me. Don't smaller sensors appear more noisy simply because the image needs to be enlarged more, noise included?

Seems to me that saying a FF sensor has less noise because it gathers more light is akin to saying a telephoto lens "compresses perspective".

Well, you need to "enlarge" value of a single pixel on small DC is "equivalent" with you can "concentrate" value of a single pixel of a full frame sensor, because you get more light on a single pixel on FF than small DC. Same theory, different approach to tell it. However, by "total light" way, you can unify all means of equivalent by a single formula - equivalent focus length to determine field of view, equivalent aperture for depth of view and noise performance (with sqrt())

Direct link | Posted on Jul 14, 2014 at 17:15 UTC
On What is equivalence and why should I care? article (2004 comments in total)
In reply to:

Louschro: What is the advantage of using a camera with a larger sensor? You can take any (!) equivalent picture, that a camera with a smaller sensor can take. But additionally there is the potential to take (non equivalent) pictures with less DOF and less noise, which cameras with smaller sensor can't take. You have decide: Is this potential so important for you, that you would accept the burden to always carry the larger and heavier system?

Very often larger sensors have more resolution. How does it affect equivalence? In this case the equivalence of noise is not given. Instead the pictures will have more noise due to the smaller pixels.

You can use canon 5D and 50/1.2 lense for extreme low light or very shallow DOF. To achieve similar effect on m43, you need 100/0.6 lense, last time I check, m43 doesn't offer that option and certainly won't be cheap either if they do. That's the advantage of larger format.

Direct link | Posted on Jul 11, 2014 at 23:58 UTC
On What is equivalence and why should I care? article (2004 comments in total)
In reply to:

DrummerCT: What are the theoretical limits as to how "good" digital cameras can become? For the sake of discussion, assume sensor sizes as referred to in the article, nothing larger than FF. What I'm getting at is, in the next 20-25 years, will we have sensors/lenses/ISO/electronics etc. that can produce images beyond our ability to see noise and other aberrations in non-cropped forms. Same question, I suppose, would apply to display and print technologies.

In the world of audio recording, we're pretty close to having reached such prowess in the recording process, i.e., noise is hard to perceive in non-compressed, high sampling rate recordings (not there yet with playback).

@Mike FL

Yes, you can see noise from your naked eyes if you are really want to find them.

I did this experiment before, in a very dark room, with very little available light, and when your eyes are accustomed to the darkness, try to look at darker area in the darkness, you will see the noise from your naked eyes. Normally if there is something interesting in the scene, our brain will focus on the interesting part, you won't notice the noise. You can see the noise only when you are looking for it.

Interestingly, the noise I saw is more like electronic noise from a CCD or CMOS, they are colored as red,blue, green. I believe that's because our eyes has 3 types of cells to detect each type of light

Direct link | Posted on Jul 11, 2014 at 19:08 UTC
In reply to:

Reality Check: As interesting as this sounds (especially to those of the recent digital age, and some Sony engineers apparently) this is just OLD technology/concept revisited...
We tried this back in the film days (in concept) for the very same reasons - smaller/simpler/cheaper lenses with better performance across the image frame, etc..
What was determined back then (as is being 'discovered' today) is the very limited beneficial uses provided. Wide angle lenses, due the intrinsic field curvature of the elements used in their design, are almost the only area of benefit. Just about anything longer than ~50mm would itself have to be -redesigned- in order to project effectively, which would of course exponentially consume any cost savings of simpler/cheaper wide angle lenses.
Sony has provided theoretical information to suggest greater sensor performance, noting signal noise reduction etc, but nothing that could not be accomplished by putting R&D towards 'fewer' 'larger' and 'better' photosites..

You can trace the idea of airplane way back to Greek Mythology, that's doesn't mean Wright Bro or modern jet flights are just OLD concept revisited.

Some innovation are easily to formulate from mind, but it is very hard to turn it to reality given technology limits.

Unlike film, solid cmos/ccd sensors are very hard to bend, so it takes great courage and money to invest that direction.

Direct link | Posted on Jul 10, 2014 at 22:35 UTC
On What is equivalence and why should I care? article (2004 comments in total)
In reply to:

nerd2: One observation is that designing the truly equivalent lenses for smaller format (for example, AF 35mm 1.0 for APS that's equivalent to 50/1.4 for FF) won't be THAT hard, at least for mirrorless cameras, contrary to claims.

See, nikkor 50mm 1.4G weighs 278gr, has 8 optical elements, costs around $400. We now have $100 generic focal reducers which adds ~100gr of glasses at the back of the lens to convert it into 36mm f1.0 lens - then WHY don't manufacturers just put them together and sell a well calibrated, AF-capable 36mm f1.0 lens with 400gr weight at $600?

Or, Sigma and Tamron already have enough information to make AF lens with IS/VR for all mounts. Why don't they release a 'quality' focal reducer that has full AF and IS/VR capability?

"Or, Sigma and Tamron already have enough information to make AF lens with IS/VR for all mounts. Why don't they release a 'quality' focal reducer that has full AF and IS/VR capability?"

Because they want to sell lenses. If they make a quality focal reducer, the obvious consequence for them is they would sell less lenses, because the owner of focal reducer will more likely to continue to use old lenses instead of buying new native designed ones for smaller format.

Direct link | Posted on Jul 10, 2014 at 17:14 UTC
On What is equivalence and why should I care? article (2004 comments in total)
In reply to:

forpetessake: There has been more than 1000 comments so far. What can be learned from them?

1) Many people don't read, at least don't engage their minds while reading, but nevertheless they are quick to reply. They don't read the replies to their replies either, or unable to comprehend them, because they keep repeating the same fallacies again and again.
2) Many people have difficulty understanding simple laws of physics and elementary school arithmetic. It's really shameful state of affairs. Blame expensive government schools for that.
3) the previous 2 problems are exacerbated by a "choice-supportive bias" (http://en.wikipedia.org/wiki/Choice-supportive_bias). Notice that most (if not all) of the objections are coming from the people with small sensors (m4/3, 1").

Now, the really ugly thing is that most of those people are your average voters. I shudder thinking people with such cognitive faculties go to the voting booths.

@forpetessake for point 3)
Ironically, if you present them the comparison between m43, 1" with 1/1.7", they can master the fact more quickly that between m43 and FF

Direct link | Posted on Jul 9, 2014 at 23:42 UTC
On Olympus takes Pen E-PL6 beyond Asia article (76 comments in total)

So, why delay pl6 for more than one year outside Asia?
because rest of the world don't care about latest models, it is safe to dump left over pl5 to them?

Direct link | Posted on Jul 9, 2014 at 19:54 UTC as 15th comment | 1 reply
Total: 67, showing: 1 – 20
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