October 20, 2014, 07:15:09 PM

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Messages - weixing

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31
EOS Bodies / Re: Just for Jrista: 2014 Market Data
« on: September 26, 2014, 01:15:27 AM »
Hi,
    Look like every thread in CR will "evolve" to a DR thread somehow and sometime in the future...  :P

    Example of Evolution of DR thread: from "Market Data" thread to DR thread...  ;D

    Have a nice day.

32
EOS Bodies / Re: Official: Canon EOS 7D Mark II
« on: September 25, 2014, 10:03:21 AM »
Hi,
    I was browsing at YouTube and saw this interesting video on 7D2... the interesting part is not the 7D2:
http://www.youtube.com/watch?v=OAJBbrGs6JY

    Have a nice day.

33
EOS Bodies / Re: Official: Canon EOS 7D Mark II
« on: September 25, 2014, 09:10:11 AM »
Hi,
    Take a look at the 7D2 manual and realized that the intervalometer implementation of 7D2 is not that good... you cannot set the exposure time in the intervalometer and the function cannot work in bulb mode which mean that you cannot use the intervalometer for exposure longer than 30s. May be the programmer should take a look at their TC-80N3... or may be they did look at the TC-80N3, that's why they remove it (although I think they might just overlook it)...  ::) Hopefully (double finger cross), they'll fix this by moving the bulb timer (which is under the bulb mode) function into the intervalometer in the next firmware update.

   Have a nice day.

34
Site Information / Re: Canon Rumors Site & iOS 8 Issues
« on: September 25, 2014, 08:24:07 AM »
maybe your iphone is already in an iBendable state  ;D

http://www.dailymail.co.uk/sciencetech/article-2767465/On-bend-er-Just-days-iPhone-6-Plus-launched-come-reports-bends-leave-pocket-long.html

Hey, that's the new flexible screen technology!!  ;D

Are you sure?  I thought Apple use that technology on their 5S as well.
Hi,
   Apple will said that this is a special feature of the iPhone 6+... you can bend the iPhone 6+ to fit your face contour... ha ha ha  :P

   Have a nice day.

35
No reason to preorder "new" technology before all the bugs are worked out!
this isn't Nikon :P
Hi,
   I think Canon product are quite well tested... from 300D, 450D, 60D, 6D, G15 and SX50, I never send in my camera once due to camera issue and I think 7D2 won't be the first... finger cross... :P

   Have a nice day.

36
EOS Bodies - For Stills / Re: Posting about sensors and DR!
« on: September 25, 2014, 05:16:15 AM »
Buy whatever gear that fit their needs and move on. I heard enough about people keep telling they going to switch to Nikon and Sony for the better, still, none have done so.

Talk is cheap, be a man and do it.

Yup, talk is cheap:

...

I don't ever just buy before I give it a real good try. But I'm not just a bag full of words, either. :P I intend to get a solid handle on the state of Sony raw files (and the full range of the consequences of their lossy compression) before I bite the bullet, but even if I can't work the data like I can with a Nikon RAW, it should still be worlds better than Canon data.
Hi,
    Renting also not cheap... :o

    Anyway, I try out the A7R and A7S with metalbones, A7R focusing is really slow in low light and I don't like the heavy shutter... the A7s had better shutter feel and AF in low light is faster, but still not very consistent.

    Enjoy the camera...  ;D

    Have a nice day.

Yeah, I've heard about the shutter shock problem. Part of the reason I'm renting first. It's not all that bad, considering its some $2400 to buy the camera lone, let alone the adapter.

I'll try the A7s at some point, or whatever new cameras Sony releases next year. I particularly want to get a handle on the raw IQ, and the impact of compression. I want my RAW to be RAW...and I don't like the use of lossy compression for "raw" data. I'm hoping it isn't a huge deal, but I guess we'll see.
Hi,
   Anyway, I don't think I'll buy any expensive Sony product... the issue with Sony is their technical support... Not sure about your country Sony support, but my country Sony technical support is really bad... out of warranty (2 year old and out of warranty by 1 year) notebook screen crack, no parts... power adapter damage, no replacement available...   >:( Sony really need to improve their technical support...

   Have a nice day.

37
EOS Bodies - For Stills / Re: Posting about sensors and DR!
« on: September 25, 2014, 01:32:10 AM »
Buy whatever gear that fit their needs and move on. I heard enough about people keep telling they going to switch to Nikon and Sony for the better, still, none have done so.

Talk is cheap, be a man and do it.

Yup, talk is cheap:



I don't ever just buy before I give it a real good try. But I'm not just a bag full of words, either. :P I intend to get a solid handle on the state of Sony raw files (and the full range of the consequences of their lossy compression) before I bite the bullet, but even if I can't work the data like I can with a Nikon RAW, it should still be worlds better than Canon data.
Hi,
    Renting also not cheap... :o

    Anyway, I try out the A7R and A7S with metalbones, A7R focusing is really slow in low light and I don't like the heavy shutter... the A7s had better shutter feel and AF in low light is faster, but still not very consistent.

    Enjoy the camera...  ;D

    Have a nice day.

38
EOS Bodies - For Stills / Re: Posting about sensors and DR!
« on: September 24, 2014, 03:39:11 AM »
Hi,
   May be Canon can just design a single shot HDR mode... like HTP, but produce only 1 single "RAW" file for people who want more DR.  :P

   Have a nice day.

39
EOS Bodies - For Stills / Re: Posting about sensors and DR!
« on: September 24, 2014, 12:42:00 AM »
It used to be amusing, seems to have lost it's amusement factor of late, the snide personal attacks that abound, the "I'm smarter than anyone else" viewpoints, Human Nature at it's worse in almost any thread that mentions Canon Sensors/DR, the "how dare you have an opinion that differs to mine"damn pity but their you are.

I'de suggest feeding anyone that mentions DR/Canon Sensors to those meat eating Squirrels, in particular those that I've seen Sporgon post Images of, Scottish Squirrels seem to be extra "meaty", I guess that would mean though that I'm first in line, I mentioned the dreaded S & DR words twice in this Post alone, deserving of eternal damnation, at least.
Hi,
   If the DR debate keep carry on, "squirrel" might become to most used word or at least the most common animal name appear in CR... hopefully I'll not get "Canon Rumors" as the first entry when google "squirrel" in the future... ha ha ha  ;D ;D

   Have a nice day.

40
EOS Bodies / Re: Am I the only one excited about the new 7D mk2?
« on: September 24, 2014, 12:27:20 AM »
  After a little reading and reviewing the RAW files I have canceled my pre-order here in Thailand. I was caught up in the hype. hummm

Here is some good reading about the AF systems on EOS cameras if anyone is interested.
http://www.the-digital-picture.com/Photography-Tips/canon-eos-dslr-autofocus-explained.aspx
Hi,
    I just wonder what the expectation everyone had with 7D2... it's quite obvious that this camera is not IQ priority... the 7D2 is all about speed... speed to capture the moment.

   I sold my 6D once 7D2 is announce... 6D is an excellent camera with very good IQ, but since I use my camera mainly for birding, I had a problem with 6D: 6D don't focus well when subject is small and most birds are "small" especially for FF camera... even my old 60D focus better than 6D for birds. So basically:
1) 6D will give an excellent IQ, but high chance of out of focus image, Or
2) 7D2 had high chance of getting an in focus image, but there will be a lot more noise. 

   So my conclusion is to sell the 6D and get the 7D2 (since I can't afford 5D3 or 1Dx) because as noise reduction algorithm and computation power improve, the possibility of cleaning up a noisy image is higher than to make an out of focus image in focus.

   Have a nice day.

41
It's nice to hear that Canon Cinema EOS products are being used on such a "high" profile project. Couldn't resist ;-) Canon products are top notch and easy to use with probably the best "out of the box" picture quality, so no surprise they were selected by NASA.

However, as a filmmaker who frequents this site I can't just take a press release with that info as a substitute for much needed video spec bumps in the Cinema EOS and HDSLR video line.

I'll need a 4K-capable DSLR with high ISO that matches the Sony A7S or the Sony FS7 on specs and price to buy another Canon body.

No hate here, just love and wanting Canon to pull out the stops instead of worrying about cannibalizing themselves.
Hi,
    Hmm.... 4K seem to be getting popular just a year after Canon launch the 5D3, so if Canon maintain their release schedule of high-end DSLR and release the 5D4 and 1Dx2 with 4K in the next year or so, they may found themselves behind again when suddenly 6K become popular in a year later and everyone want 6K in their camera... I think Canon don't want to follow Sony way of releasing camera model after model in such a short period of time... So if Canon want to maintain their DSLR release schedule for the high-end body and be competitive, may be, just may be, the next generation Canon DSLR will skip the 4K and go straight to 6K or even 8K.

    Have a nice day.

42
Lenses / Re: Canon APS-C<Speedbooster<EF Lens. Possible?
« on: September 23, 2014, 10:33:24 PM »
Hi people!

I am sorry if this a stupid question but I have to ask in order to learn.

Is possible such a combination?: A Canon crop camera with a (I think not existing)speedbooster and any EF lens in order to gather the "extra" light the lens is providing and the sensor, due to its smaller surface, is not able to use. Would it improve APS-C sensor ISO performance?

Thanks in advance and sorry if it is a completly dumb question.
Hi,
    Speedbooster is basically a focal reducer. IMHO, it's had nothing to do with sensor size as long as the original lens produce an image circle that can cover the sensor, but focal reducer will usually reduce the distance where the image is focus on, so it's difficult (if possible) to maintain flange focal distance of any lens and mount of the same type. That's why speedbooster only appear for SLR lens to mirrorless mount, so speedbooster for EF lens to EF mount might not be possible, but speedbooster for EF lens to EF-M mount is possible.

    Have a nice day.

43
I hope I'm not high jacking this thread ... It's gone way too scientific for me to comprehend fully despite trawling tHrough the posts.

Would it be a reasonable conclusion to draw that at low ISO (100-400), the difference between the APS-C and the FF is negligible, thereby meaning that the reach benefit could be satisfactorily obtained at the low ISOs?

There is always a difference. It may only be negligible for those who don't care.

Thanks. What differences would be obvious and what would be the ones you would look for? Again, I'm talking only of low ISO.

Sharpness, contrast, aberrations.

Hmm ... so basically sharpness and contrast are the obvious ones and the aberrations would be the one you would look for. Thanks for this.

To my mind sharpness has been relative, depending more on the available light and the focusing. Why the FF should be sharper is something I've not really understood.

BTW, wouldn't the aberrations be caused by the lens instead of the camera body?

(Hint) Diffraction-limited optics = FF sharper, either because the pixels are larger or there is more of them.
Aberrations are caused by the lens. If a lens is producing (let's say) 3 pixel wide aberration on 20mp FF sensor, then the same lens will produce 5 pixels wide aberration on 20mp APS-C sensor just because those pixels are 1.6x smaller and denser. Simple math here.
Hi,
   IMHO, it's not a straight forward answer... yes, a crop sensor will "amplify" the lens aberrations, but if you are using a FF lens on a crop sensor especially a good FF lens, you might get better IQ as the lens usually perform better at the center area... Look at any MTF lens and you'll see a lot of lens start to degrade after the 15mm mark, but a crop sensor user can basically ignore anything after the 10mm on the MTF chart.

   Have a nice day.

44
EOS Bodies - For Stills / Re: POLL: What's more important, gps or wifi?
« on: September 23, 2014, 02:27:24 AM »
You missed another option:  Don't give a damn about either of them.

I have GPS in my Car and My phone why do I need another one in my camera.  What's next one in my shoes?

WiFi Not sure why I need that in a camera either.
Hi,
    Sometime, I also wonder this when I wear my watch... my phone got clock, my camera got clock, my GPS unit got clock and even my bluetooth earpiece also got clock, so why am I wearing the watch??? Ha ha ha ;D ;D ;D Hmm... May be the only reason I can think of why I wear my watch is that the battery life of my watch outlast all the above device as the watch had auto solar cell charging (basically will last as long as the watch is working), so if one day I forgot to charge all the above device, I still had my watch... ha ha ha

   Have a nice day.

45
EOS Bodies / Re: Am I the only one excited about the new 7D mk2?
« on: September 22, 2014, 12:17:14 PM »
I'm also a little bummed the AF system is not comparable to the 61pt system in terms of point sensitivity. It seems most of the points are only f/5.6 sensitive, which means there won't be any AF performance bonus at f/4 or f/2.8 (outside of the central point(s), at least.) I think the AF system will perform well, but for those who have f/4 or f/2.8 prime teles, I honestly don't think it will perform as well as the 61pt system. The 1D X also provides increased AF drive power, so it will still focus faster (not even the 5D III focuses as fast as the 1D X.)
Hi,
    Hmm... If I understand Canon AF technology correctly, all 65 points of 7D2 AF points are cross-type when using lens as narrow as f5.6 means that's it'll be cross type if you use a lens faster than or equal to f5.6. The center point will be dual cross points when use with lens faster or equal to f2.8.

    If you compare the 61 points AF use by 1Dx and 5D3, only 41 points out of 61 points are cross-type when use with lens faster than or equal to f5.6. Of course, it had 5 dual cross points at the center when use with lens faster or equal to f2.8 which is better than 7D2.

    Generally, all Canon lens (except some lens) without TC will enjoy the AF performance bonus of the cross-type for all the 65 AF points which is an improvement over the 61 points AF module, right??

   Have a nice day.

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