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Messages - weixing

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136
Hi,
Is it possible for a lens to focus fine (high keeper rate) on close objects and have a difficult time focusing on distant objects? User error plays a huge role when focusing on distant objects but my question is mechanical.  Could a lens be defective in this way? :-[
    It's depend on the temperature you shoot. If the weather is hot, the further the object, the worst it is... this is basically due to rising of hot air (air mass is consider a lens element and when air is not stable, it's act as a irregular lenses) which make the image of far object blur especially obvious if you use a large diameter, long focal length lens (like the 600mm F4).

   Have a nice day.

137
EOS Bodies / Re: EOS 7D Mark II, EOS 70D & 700D in 2013? [CR1]
« on: September 23, 2012, 11:52:41 AM »
Hi,
Does that mean there will be no 70D (am I reading this correctly), but there will be a 7D2 with the same shared sensor as a new 700D/T5i?

edit: cannot see Canon launching a 70D and 700D in the same season
   It's said 7DII, 70D & 700D... Will be very interesting if they launch 3 DSLR with the number 7 in one event (I doubt Canon will do that)... ha ha ha  8)

   Have a nice day.

138
EOS Bodies / Re: 46.1mp Canon DSLR Previewed at PhotoPlus 2012? [CR1]
« on: September 23, 2012, 01:45:09 AM »
Hi,
Watch out for Nikon crew, they're on a roll and they're not done yet.

D5100's 16MP * 1.5 * 1.5 = 36MP D800, and they have very similar base ISO performance

D3200's 24MP * 1.5 * 1.5 = 54MP D4x?, and would have very similar base ISO performance + all the extra goodness a high end body would add... and that's still over 1 EV better base ISO DR than Canon's current best-tested tho were waiting/hoping the 1Dx and 6D will fare better than the 5d3.

But if they're considering a FF version of the sensor tech used in current 18MP APS-C bodies...  Well... no thanks.
Go back to the drawing board, or better yet, the patent office and search for some better tech to license.
     May be Canon should just use the 120MP APS-H sensor (which are capable of delivering 9.5fps, but I doubt any current CF card can support it) they developed 2 years ago in their camera... ha ha ha  ;D

   Have a nice day.

139
EOS Bodies / Re: 46.1mp Canon DSLR Previewed at PhotoPlus 2012? [CR1]
« on: September 22, 2012, 11:58:20 PM »
Hi,
46.1mp Full Frame
5 FPS
ISO 100-12800
16bit
   16-bits?? Landscape shooter should be happy, but I can't imagine the file size... file size of 46.1MP at 16-bits should be around 92.2MB per RAW file. Surprise that still can maintain 5fps... must use the 1000x write speed card.

   Have a nice day.

140
EOS Bodies / Re: DxOMark Sensor Performance: Nikon vs. Canon
« on: September 22, 2012, 08:11:58 AM »
Hi,

   DxO said they test the sensor, but IMHO, they are actually testing the camera, because they test using the RAW file from the camera not the RAW data directly from the sensor. If the RAW file is not RAW data, then you are not testing the sensor, but how camera handle the image.

   Have a nice day.

141
EOS Bodies - For Stills / Re: A positive feedback for 6D
« on: September 19, 2012, 11:57:40 PM »
Hi,
   Look like 6D had a super center AF point.  ;D

   A lot people was wondering why 6D had only 11 AF and only the center is cross-type? I suspect it might due to design, current technology and cost limitation... may be to increase an AF point sensitive, it require a different design or take up more space in the AF sensor, so you might not have enough space to put in more AF points especially those cross type. What do you guy think? May be 6D was like 7D... a model to test out new technology in the real world before it went into their mainstream model.

   Have a nice day.

142
EOS Bodies / Re: DxOMark Sensor Performance: Nikon vs. Canon
« on: September 19, 2012, 09:16:38 PM »
Hi,
   IMHO, DxOMark is not testing the sensor, but the camera itself because they use the RAW file produce by the DSLR (they didn't remove the sensor from the body and test, right?) and if the RAW file produce by the camera is not the RAW data, then it's not testing the sensor and the sensor compare between brands is somehow not valid. I believe all RAW file is not RAW data and Nikon RAW file are well know for it.

   Anyway, I was wondering how do Nikon D800 and D600 get a dynamic range of more than 14EV when there is only 14-bit of data? Compress the dynamic range or non-linear data?

   Have a nice day.

143
Third Party Manufacturers / Re: D600 DXO is out!!!
« on: September 19, 2012, 09:01:21 PM »
Hi,
   From DxOMark result on D800 and now, D600, I was wondering how Nikon DSLR dynamic range able to get a 14.4EV for D800 and 14.2EV for D600 when they only had 14-bits?? Unless they somehow compress their data in certain part of the dynamic range or the data is non-linear?

   Have a nice day.

144
Hi,
   Conspiracy theory: Canon and Nikon plan to earn more money from us.
1) Canon come out better DSLR and lens than Nikon and flood the internet that Canon DSLR is way better than Nikon: Many dump their Nikon DSLR and lens and switch to Canon.

2) Then Nikon come out even better DSLR and lens than Canon and flood the internet that Nikon DSLR is way better than Canon: Many dump their Canon DSLR and lens (probably those who switch to Canon) and switch to Nikon.

3) Goto 1

   Both Canon and Nikon earns more $$$ from us... ha ha ha  :P ;D ;D
   
   Have a nice day.

145
EOS Bodies / Re: At what price point will you consider buying the Canon 6D?
« on: September 18, 2012, 01:23:48 PM »
Hi,
it depends a lot on the sensor performance.. a banding free low iso monster would be very welcome.

I doubt we would see that on the lowest-end camera of Canon's lineup.

I would buy the 6D for 1500$/€, assuming sensor and AF performance are at least decent. That would give me enough saving to buy a nice collection of FF glass, so next time I will have enough money to spend on the body alone.

If I have to buy a 2100$/€ camera (that therefore I must be happy to keep for a longer time), then I'm definitely buying the D600. Due to other expenses I'm planning my purchase for February 2013. Let's see how the situation will be then.
    I saw the Nikon D600 today... look like a D7000. Didn't have the time to play with it, but initial impression is the focusing speed seem a bit slow.

   Have a nice day.

146
EOS Bodies / Re: Canon EOS 6D Official Specs
« on: September 17, 2012, 05:10:21 AM »
Hi,
   A full frame 60D without flip screen... ha ha ha  :P

   One feature interest me: center point cross-type and sensitive to -3 EV.

   Since some report that 5D3 able to AF at F8 using 3rd party tele-extender and this 6D is a stop better than 5D3 at center point, so possible to AF at F11? If so, I might be interested to change my 60D to this... I only use the center point, so no problem with only center point is cross type.

   Have a nice day.


I never saw guys with 5D3 focusing at f8, if there is, probably a minority, correct me if I'm wrong though. And what makes you think that sensitive to -3EV means that the 6D will focus at f11? It's more of the AF module like the 1DsIII 1DIV can focus at f8, but 1Dx(it can with 856+kenko according to Author) and 5D3 cannot

    Some tested and work:
http://www.the-digital-picture.com/News/News-Post.aspx?News=3022

    So I still had some hope... Anyway, I'll and see... if can and reliable, than I might switch.

   Have a nice day.

147
EOS Bodies / Re: Canon EOS 6D Official Specs
« on: September 17, 2012, 05:01:33 AM »
Hi,
   A full frame 60D without flip screen... ha ha ha  :P

   One feature interest me: center point cross-type and sensitive to -3 EV.

   Since some report that 5D3 able to AF at F8 using 3rd party tele-extender and this 6D is a stop better than 5D3 at center point, so possible to AF at F11? If so, I might be interested to change my 60D to this... I only use the center point, so no problem with only center point is cross type.

   Have a nice day.

148
Lenses / Re: Gear for shooting Birds of Prey?
« on: September 17, 2012, 01:43:12 AM »
Hi,
I like my 400 f5.6L on the 7d. I can crop it in a bit if I need to.
    I'm using 400mm F5.6L (500mm and above are out of my $$$ reach) on a 60D for birding. I'm not sure about your country Birds of Prey, but in my country, they are very difficult to get close in the wild compare to other birds. For most of my shot, they seldom exceed 50% in my 60D frame, so after cropping, I'll get around 4MP. If I'm using a FF camera, it'll only be 2MP (I hope my maths is correct).

    So, IMHO, it's best for you to get a >= 500mm lens + 1.4x tele-extender for your 5D3 or get a 60D or 7D and a 400mm F5.6L (which is the cheapest option).

    Have a nice day.

149
Lenses / Re: 7D Crop Factoer Question
« on: September 16, 2012, 10:48:03 PM »
Hi,
The crop factor for Canon APS-C is 1.62, not 1.6.
    Not all Canon APS-C sensor had the same size, so it should be: ~1.6x   :P

   Have a nice day.

150
EOS Bodies / Re: Canon EOS 6D Official Specs
« on: September 16, 2012, 10:31:33 PM »
Hi,
    From spec, 11 AF point with multi-area AF... Hmm... look like a sub 7D AF... hopefully, it'll be all cross type AF point. Built-in GPS and Wireless... I think it'll be US$2K++

   Have a nice day.

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