December 26, 2014, 01:32:46 AM

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Messages - weixing

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16
Canon General / Re: Canon USA Addresses the Gray Market
« on: December 17, 2014, 06:54:18 AM »
Hi,
    I'm not surprise and don't understand why people here upset about it. Canon had many offices and service centers in many country and all of them are local company that need $$ to operate, so why you expect the local Canon company to service your under warranty Canon product FOC when you live here but buy from another country?? It's simple, if you decided to buy a gray product, you also must accept the risk of not having a local warranty.

    Anyway, just be careful when buying a gray product as not all Canon product had the same specification... For example, Canon 6D(WG) had Wifi and GPS, but Canon 6D (N) do not.

    By the way, Canon product in USA are a lot cheaper than in my country, but I usually don't buy expensive products with electronics and motor in it without a local warranty.

    Have a nice day.

17
Canon General / Re: Sensor life
« on: December 15, 2014, 06:51:43 AM »
Hi,
Is there something like 'sensor hours' before it goes bad?
Why assume they will go bad?  Maybe we'll discover that sensors get better with age?  Perhaps in 100 years time artists will covet the sensors from the early 2000's for their colour shifts, dead pixels, CFA fading, sun damage, laser damage, accumulated background radiation exposure etc etc?  All of these should give each sensor a unique signature that sets it apart from the mainstream, making them very valuable.  In fact, I'm going to start stocking up now.
    Yes... better stock now. In 50 years time, the king of "Canography" will be 1D4 or may be 1DX.... ha ha ha  ;D

   Have a nice day.

18
EOS Bodies / Re: Using full frame lens on crop body cameras ?
« on: December 15, 2014, 06:42:49 AM »
Hi,
+1 to Joey.  That is probably the best explanation I've ever heard and also one of the most intelligent arguments I've seen on a forum in years.  I had actually believed that none sense about depth of field on crop bodies until now. Thanks
    Actually, it's not nonsense, it's just that most people assume that the image framing is the same (same field of view) when mentioning the depth of field on crop camera.... to get the same image framing (same field of view... eg. half body portrait on FF camera = half body portrait on crop camera), you need to be further away from the subject or use a shorter lens at the same distance... which will increase the depth of field.

   Have a nice day.

19
EOS Bodies / Re: Focus problems with the Canon 7DII?
« on: December 12, 2014, 06:44:44 AM »
Has anyone else had this happen, and if so, what did you do?

Interesting, because I would have expected the exact opposite: My single-point 6d/60d completely screw up in falling snow because with just one piece of information, the camera cannot decide if it's a subject or "gras/snow/... in front of subject" lock. I'd guess that with multi-af, the camera should be smarter, at least in theory.

The camera did nothing when you pushed the shutter.... no hunting and no shutter release... It took me a minute or two to realize what was happening... If I pointed it at the deer, nothing. If I pointed it at a nearby tree, it worked. It was as if you had a distance switch set to focus on close objects only. (there is no such switch on the 17-55) I swapped lenses out for a 70-200 and it did the exact same thing. I tried manual focus and the shutter would release, but absolutely dead in auto-focus mode when you pointed it at a more distant object....

I am going to have to re-read the AF system manual and see if the various setting have any impact.
Hi,
    My country don't snow, so can't test, but will rain very heavily... hmm... may be I'll test shooting the rain and see what happen (don't ask me to test the weather sealing of 7D2 because I'm not weather sealed... ha ha ha ) :P Anyway, there are so many possible condition out there that the camera AF will face, not surprise if there are certain condition that the testing procedure miss that will cause the AF system to be confuse.

    By the way, this guy 7D2 seem ok shooting in blizzard... http://www.foto-buzz.com/index.php?script=page&id=77&type=fotoskool

    Have a nice day.

20
EOS Bodies - For Stills / Re: 6D vs 7D mark II
« on: December 09, 2014, 03:44:34 AM »
Hi,
   IMHO, if you seldom shoot action and birds, get a 6D. No point trading IQ for fast frame rate and AF system if you don't need it most of the time.

   Have a nice day.

21
EOS Bodies / Re: Focus problems with the Canon 7DII?
« on: December 07, 2014, 01:08:39 PM »
Turning off MFA when shooting at a ruler seemed to correct focusing with very wide apertures on a non-moving subject.

So this morning, I went out to redo my servo sports test, with a different BRAND NEW Canon 7Dii, same lens 24-70 2.8 (which I know is working on my 5Diii).

More soft focusing.

Im upset about this, thats 2 Canon 7Dii Bodies in a row. Ill have access to two more later this week. Ive taken a couple thousand shots with 2 different 7Diis, about 90% or so are no good.

This is what it looks like:
Hi,
    Hmm... I'm not sure, but look like it's seem too out of focus to be an AFMA issue... just wonder how big the  error require to get this out of focus?? May be you should post the original jpeg with all the info intact (such as AF points) for us to take a look.

   By the way, what's your settings on the "AI Servo 1st image priority" and "AI Servo 2nd image priority"??

   Have a nice day.

22
Hi,
   Nice image, but no one said that low ISO DR is not importance... to some, it's importance, but to others, it might not as importance.

   Anyway, I though lights and shadows are importance in photography, but it's seem like the current trend is all lights and no shadows....

   Have a nice day.

23
EOS Bodies - For Stills / Re: 7d Mark ii not responding F00
« on: December 06, 2014, 05:05:09 AM »
Hi,
   My 7D2 had no problem so far with my EF 400mm F5.6L by itself, but will hang (sometime cannot power on) when use with the Kenko 1.4x Teleplus Pro 300 DGX. The interesting part is the Kenko 1.4x Teleplus Pro 300 DGX work with my Tamron 150-600mm on the 7D2... AF super unreliable, but at least it try to AF and don't hang...  :P

    Have a nice day.

24
EOS Bodies / Re: Petapixel: Canon Full Frame Mirrorless
« on: December 05, 2014, 07:42:24 PM »
No mistake.  There will be a complete transition. Ef-s is the dead end. ;-)

Ef-m = sole surviving aps-c mount
Ef = surviving mount for tele > 100mm
Ef-x = new, dominant mount for mirrorless ff < 100mm.

Advantage for canon: mirrorless ff buyers have to purchase body and new lenses. Bodies cheap, lenses expensive. See sony A7 series plus FE lenses.  ;-)
Hi,
    EF-S = low cost lens for crop camera.
    EF-M = lens for compact mirrorless camera.
    EF = main lens mount for all the rest.

    IMHO, Canon will maintain the EF mount as the main mount since they are still coming out new lens for EF mount. If Canon going to FF mirrorless, it'll still be an EF mount... if they want to come out with a small FF mirrorless, they can use EOS 100D (Rebel SL1 ) as a model for it.... small enough, but still can install a larger battery for the power hungry mirrorless camera.

    Have a nice day.

25
EOS Bodies / Re: Petapixel: Canon Full Frame Mirrorless
« on: December 03, 2014, 10:04:24 PM »
I'm probably in the minority by wanting a large mirrorless camera.  Canon has certainly said that the majority of buyers want smaller cameras, so there is every possibility that will prevail.
 
Canon did patent a new lens mount that may have been targeted at a mirrorless.
 
So, while I'd like a Mirrorless that used EF lenses native, its unlikely to actually happen.  Canon will come out with a new lens series, and a adaptor for EF lenses, then trickle out some of the new ones each year.
Hi,
   IMHO, if Canon going to replace some of their DSLR with mirrorless, they can just use EF mount:
1) All current lens will be compatible with it... don't need to spend $$ to create another new mount and new lens.
2) Handling and ergonomics - not everyone want a small camera due to handling. Also, with a small camera body, you can only put so much buttons and dials on it and ergonomics will suffer... a lots of people want fast operation... most don't want to go into the menu every time they want to change something and current Canon DSLR design had very good ergonomics.
3) If you want good IQ with high resolution image, large lens with large diameter lens element is needed and large lens don't go well with small camera body.
4) Mirrorless need more power than DSLR, if you decrease the camera size, battery life will suffer and also to drive the lens for faster AF, you need more power.

   Canon can just maintain 2 mirrorless lines:
1) DSLR size mirrorless - for people who don't mind or want a bigger camera body for better handling and ergonomics.
2) EOS M style small mirrorless - for those who want small camera.

   Anyway, Canon can just use one of their DSLR design... remove the mirror box and replace the prism with an EVF and they got a DSLR size mirrorless camera...  ;D

   By the way, I hope Canon can install a some sort of sensor curtain to cover the sensor when not in use (power off or during power saving mode) or during changing lens. An exposing sensor is not a good thing especially when changing lens in the field. Also, imaging a super telephoto lens on a mirrorless during transportation and accidentally point at the Sun... you'll end up a burning sensor.

   Have a nice day.

26
Third Party Manufacturers / Re: Samsung NX-1 Review
« on: December 02, 2014, 11:42:23 PM »
Well, I intend to try and rent an NX1 if LensRentals gets them. I don't think they currently rent Samsung gear. If not, I may simply buy one and try it out for 20 days, and return it if it has any major issues. I could probably rent a 7D II and buy a step wedge and provide some data for people to look at.


I've seen a couple reviews where the reviewers seemed to think the AF system performed quite well. I think it's fairly easy to cherry pick reviews (from the countless reviewers that are out there now) to demonstrate the opinion you want. I've stopped bothering with that myself, as it's never a winning situation...it doesn't resolve any clashing opinions, and the other side just ends up digging up some of the reviews that cater to their existing opinions to share.


I wish there was some kind of objective way to compare data from DPR. You can make subjective judgements based on what you think you see as far as comparing the images they provide in their little comparison tool. That has the same problem though...people don't see the same things. Both literally and figuratively...we all perceive things differently, but we also all have different screens with different calibrations, brightness and contrast settings, etc. Some people's screens reveal terrible aspects of my photography that make me feel like I want to barf, yet when I view the same image on my screen, it's fine. I have a high end, high quality, calibrated screen...they do not.


That's why I've tried to start measuring standard deviations, maximums and minimums, etc. with PixInsight. It's one of the very few ways I know of to produce objectively comparable data. So far, PixInsight is telling me that the NX1 image has a bit lower noise than the 7D II image. I'm not saying it's a world-shattering difference...but it seems to place the NX1 firmly between the 7D II and 5D III on the image quality scale. It's by no means an A7s competitor, nor even a 1D X competitor...and no one should have ever expected that. But as far as an APS-C getting closer to a 5D III full frame camera in IQ...I think the NX1 is currently the closest. (Based on the only objective data I've been able to get a hold of so far, anyway.)


If I ever do produce some step-wedge images for comparison between cameras, I have no doubt that there will be just as much subjectivity and controversy on what those images "tell" us as any other comparison image. For the same reasons that DPR's comparison tool and the diversity of camera reviews with wildly differing opinions produce nothing more than subjective opinions and controversial results.
    I think single-shot AF should be ok, but all review I had seen never seem to talk about servo AF.

By the way, is the bias level include in the NX-1 RAW image?? Or like Nikon, the bias level had been removed.

   Have a nice day.

27
Third Party Manufacturers / Re: Samsung NX-1 Review
« on: December 02, 2014, 11:57:28 AM »
I have often wondered why DSLRs don't do sort of a compromise mirror function where during high fps mode (think 7D Mark II 10 fps) the camera doesn't just lock the mirror up for the second or two it takes to fire off 10-20 frames and then drop the mirror back down.  Seems silly to slap the mirror up and down 10 times a second when the viewfinder is less useful.  But I also get it and understand that a good photographer by habit can see and notice things as the viewfinder "refreshes" even though it's only a fraction of a second between frames.


Because losing a whole second or more of viewfinder time means your very likely to misframe your subject or even clip part of it out of the frame when tracking something moving. You would be surprised at how much we can see change in a fraction of a second.


That's the same reason the real-time view of an OPTICAL viewfinder is so desirable...you really FEEL the lag in an EVF when tracking a subject with continuous shooting. Until the lag time gets into the microseconds range, I personally don't think I could use an EVF for action shooting. It's one of the big things I'm curious about regarding the NX1. They claim 5ms lag, which is low...but, it's not real time, and I wonder how much I'll be able to "feel" that lag.

Totally agree jrista, just like I typically agree with almost all of your posts.  I guess I'm a fan, LOL!  Note that I did mention being able to still see what's going on during the fps action of the mirror.  However, for those times when silence is top priority, it would be nice to have this in an easier way to implement than LiveView.

I think the mirrorless design, in some form, will eventually become a standard in the industry.  And until Canon or Nikon do it in a big way, it will continue to be a niche market.  The pros won't waste time with small little wanna-be systems that can't match the full ecosystem that Canon and Nikon have offered for decades.

But the little niche systems will pave the way so to speak and flesh out the bigger obstacles and failures.  I think this is what Canon and Nikon are waiting for.


Yeah, the niche systems are the guinea pig systems. :P Hopefully they will figure out the best way to solve these problems, and the big players will copy them.


There was talk about some kind of Hybrid EVF/OVF from Canon earlier in the year. Nothing ever seemed to come from that, unless Canon is calling the Transmissive-LCD updates in the 7D II to be a "hybrid EVF" (which would be a joke.) I really want to see some kind of convertible viewfinder. There are certainly uses for an EVF, such as the need for a silent shutter without the mirror slap sound, video recording, etc. There are also uses for an OVF, such as the action photography where lag can be extremely annoying at the very least, and image-killing at worse (the A7r I rented periodically seemed to build up major lag and stutter...I could never figure out why, but sometimes the frame rate would drop into the low teens, and the lag would jump to a second or so.)


EVFs have to perform exquisitely, with say 500┬Ás lag and no stutter ever, (and be ultra high resolution and high DR, like 8000ppi) before I would consider them as a truly viable replacement for an OVF during action shooting.

Totally agree jrista.  At some point, when does the cost of the EVF (and/or EVF/OVF) system start to cost more than the sensor itself?  Because the challenge is significant and as you say, the performance must be perfect and impressive to pull off replacing a good OVF.  In a crude way, the EVF is sort of a sensor in reverse and while the resolution doesn't need to match by any means, the performance, accuracy, sharpness and overall IQ + performance must go far beyond what we are currently seeing.
Hi,
    Current mirrorless camera work very well for most photography except sports and wildlife and IMHO, the 2 main obstacles for mirrorless camera are:
1) Servo AF - tracking of moving targets and I got a feeling that NX-1 isn't working very well as most "review" seem not too "eager" to comment on it.
2) Battery life - the EVF, imaging sensor and processor are working all the time when you put you look through your EVF and that drain a lots of power.

    By the way, most LCD have problem working properly under very cold temperature, so I think it'll be a problem for mirrorless camera to make the EVF work properly under this condition.... just wonder how they solve this problem for the EVF in those video camera when shooting in very cold temperature such as at the pole??

    Have a nice day.

28
Technical Support / Re: Optimal processing platform of still images
« on: December 02, 2014, 05:36:58 AM »
Hi,
    If availability (uptime) is importance to you, don't build your own system... get a branded system (such as HP) with upgrade warranty. It might be slightly more expensive, but it'll save you a lot of headache if your system is down.

   Have a nice day.

29
Lenses / Re: Review: Sensor Performance of the 7D Mark II
« on: December 02, 2014, 04:12:04 AM »
Quote
This review includes an analysis of noise, dynamic range, and full well capacity of a Canon 7D Mark II camera. The Canon 7D Mark II is the latest in the Canon (APS-C) 1.6-crop DSLR lineup. The performance is so exceptional it is a game changing camera in the Canon lineup.

When I read this at the very beginning of the review, I know I can only take it with a pinch of salt

I invite you to take a look here:

http://www.dpreview.com/previews/canon-eos-7d-mark-ii/10

Compare it to Nikon's D7100 (direct competitor from 2013)
Select Raw > ISO 100 > [Select chunk of words in the upper-middle frame]

See for yourself which camera/sensor captured more details.

"Game changing camera" in the Canon lineup. Yea right
Hi,
    Hmm... The D7100 image had better contrast, look sharper and got a bit more details (I think due to better contrast and a bit more resolution) in the fine print, but from my monitor, the fine print in the D7100 image got a lot more yellowish and blueish... is yellowish and blueish colouring in the fine print really exist in the actual scene?? IMHO, depreview should also provide an "actual reference image" for user to compare.

   By the way, we should remember that the 7D2 like the 70D is dual pixels, so it's actually a 40MP sensor in an APS-C size... with that in mind, I think the 7D2 IQ is very good... I just wonder how the IQ really look like at full 40MP... may be Canon should provide a mode (look like a new project for ML??) to output the full 40MP size image.

   Have a nice day.

30
Third Party Manufacturers / Re: Samsung NX-1 Review
« on: November 26, 2014, 07:09:01 AM »
Hi,
   After I read the manual, my impression is that the NX-1 is like a Powershot style, interchangeable lens camera... very "simple" AF system and not much customization available.

   Have a nice day.

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