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Messages - weixing

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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.
    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.

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.
    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.

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.
    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.

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.
   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.

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.
    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.

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.)
    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.

Lenses / Re: Do you keep all your boxes?
« on: September 21, 2014, 10:47:06 PM »
    Yes... I keep all my original packaging and invoice or receipt. There are some reasons why people prefer buying used item that had the Original packaging and IMHO, the most important reason is to reduce the risk of buying a stolen camera or lens. When the seller had the original boxes, it's less likely that the camera or lens is a stolen item... some buyer will request a copy of the original invoice or receipt for proof of purchase.

   Have a nice day.

The Samsung does 420MP/Sec.

The Samsung is also saving 12-bit files during continuous shooting vs. the full 14-bits in single shot mode.

So what?

You keep telling us that DR (and by extension 12bits vs 14bits) isn't important except to a small number of people so therefore this difference that you've highlighted is also relatively unimportant. Or do you wish to become one of your own DRones and insist that the extra bit-depth and thus DR is all of a sudden important?
   IMHO, when I buy a camera that have 14-bits RAW, I expect to have 14-bits RAW also when shooting at 15fps, so I'll be very mad if I buy this camera and found this to be true especially the Samsung specification didn't even specified that it's 12-bits RAW when shooting at 15fps...

  So now the question is: Does the Samsung NX1 really shoot 15fps only at 12-bits RAW?? If yes and they didn't mentioned it, I think Samsung going to be in big problem when buyer find out because shooting at 15fps was the "WOW" feature and one of the selling point that Samsung keep mention it!

  Have a nice day.

EOS Bodies - For Stills / Re: POLL: What's more important, gps or wifi?
« on: September 21, 2014, 08:46:22 AM »
    It's good to have, but ok if don't have. But I'll prefer a reliable GPS over a wifi.

    The 6D had both wifi and GPS, but the GPS take very long to get a lock on the GPS, so I use a Garmin eTrex 30 to produce a gpx file for tagging. So I hope the 7D2 GPS implementation is better and more reliable than 6D... Also, happy that 7D2 had a digital compass... may be Canon can add a map function in the camera... ha ha ha

    Have a nice day.


EOS Bodies / Re: 7DII vs Samsung NX1
« on: September 17, 2014, 01:53:22 PM »
28.2 Megapixel sensor with capability of shooting 15 frames per second. Faster than 1 DX. Is it fastest image sensor up to date?

Let's wait, if it means 15fps in RAW. It may be only 15fps in JPEG, add a small buffer to it and it only look good on paper. If it's truly 28MPix at 15fps in RAW, then I'll have to find my jaw under the table - that would be an amazing feat indeed.

Wait a minute !! Did you also see that the bit depth of this camera falls back from 14 bit to 12 bit only in continuous mode.  Is that what we would like to see ??
    There are a lot of promo video for this camera in youtube and 15fps is one of the selling point for this camera. When they said 15fps, most people will assume that it's at full resolution at full bit depth. Not even a fine print in their website indicate this...

    IMHO, if this is true, they better mention this in their camera specification as this is really bad for Samsung reputation and not a good move when you start going into a new market... just imagine what the customer will feel if they found this out after they brought this camera with the 300mm f2.8...  :o

   Hmm... just wonder is this camera 4K UHD video is in colour or black and white... ha ha ha  :P

   Have a nice day.

PS: 14-bits to 12-bits mean approx. to "saving" 7MB of data per frame.

   I think Samsung are able to come out with good camera hardware, but can't said the same thing about their software... just take a look at their pre-android smartphone.... good phone hardware, but the phone software really can't make it... even now, their software still can't make it.

   Anyway, a good camera not only need to have good specification, but also the software (firmware) must be stable and reliable... my confidence is not very high base on their past record...

   Have a nice day.


    Is the camera too small or the lens too big??  :o

    Anyway, no distance scale and seem like the tripod collar is not removable...

     Just wonder how much does it cost???

     Have a nice day.


EOS Bodies / Re: Official: Canon EOS 7D Mark II
« on: September 15, 2014, 09:40:18 PM »
    Not sure anyone posted already, but here is the some 7D2 sample images (JPEG only) and video.

    Have a nice day.

EOS Bodies / Re: Official: Canon EOS 7D Mark II
« on: September 15, 2014, 11:29:26 AM »
   Dpreview indictae that "It features 65 AF points spread across a significant portion of the frame, with especially wide horizontal coverage. All of these AF points are cross-type (when using lenses with a maximum aperture of f/5.6 or faster), with the center AF point capable of high-precision, dual cross-type focusing with wider aperture (f/2.8 and faster) lenses.". So all 65AF point is cross type when using a F5.6 or faster lens... that's sound good.

  Look like I'm getting one...

  Have a nice day.

    Hope they don't follow Sony... launch many camera model every year, but forget to launch any lens... especially those affordable by normal people.

    Have a nice day.

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