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Messages - weixing

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136
Lenses / Re: Bridge not sharp - why?
« on: March 12, 2013, 01:05:10 AM »
did you confirm that Mirror Lock was on? didnt see that in any of your replies. anyone else having issues like this in the future should understand that this is a likely cuplrit for camera shake at slow shutterspeeds on a tripod.

you also have to be careful of your own movement when making exposures like this. even if you are not physically touching the camera or tripod, walking around the camera position can cause vibration in the ground (depending on the surface you are on) and that can be transferred through the tripod and show up in exposures. this is not as likely outdoors but i have seen it happen on several occasions indoors when i or someone else walked by my rig during a long exposure.

Didn't use mirror lock. It might be helpful in some situations, but it wouldn't have caused this kind of motion blur.
   Err... Mirror lock-up is use to prevent this kind of blur... not create it. You should use mirror lock-up or live view when shooting at slow shutter speed.

   Have a nice day.

137
Lenses / Re: Bridge not sharp - why?
« on: March 11, 2013, 08:29:37 AM »
Hi,
   How heavy is your tripod? Make sure your tripod is steady and your setup is heavy enough... if you are using those carbon tripod, your setup might not be heavy enough to prevent the slight shake that cause by wind, people walking nearby & etc. You didn't see your camera shake, doesn't mean the camera didn't shake... at 1/20s, a slight shake during the exposure can cause your image to be blur. You can use the hook (a lot of modern tripod had that) below the tripod to hang something heavy to increase the weight of the setup.

   Best is to increase your ISO to get a higher shutter speed. If not, I recommend you to use live view to focus at the object using 10x, make sure everything is lock down and make sure you see that the image is perfectly still before you trigger the shot... also, try to be as still as possible when trigger the remote cable... don't laugh... during some macro shot, I can see the image shake a bit in live view when I move my feet a bit.

   Also, the blur might be cause by air turbulence which is very possible by looking at your image... the temperature different between the heated stone bridge and the cooler environment in the shadow might create some air turbulence which blur the image.

   Just my $0.02.

   Have a nice day.

138
EOS Bodies / Re: Will the 70d have a new sensor?
« on: March 09, 2013, 02:36:35 AM »
Hi,
   IMHO, 700D, 70D and 7DII will all using the same new sensor... build quality, focusing speed, frame rate and features available will differential the models. Release sequence will be 70D, 700D and 7DII.

   Have a nice day.

139
EOS Bodies / Re: Canon EOS 6D Firmware by June? [CR1]
« on: March 07, 2013, 09:37:50 AM »
Hi,
   I was expecting the 6D to have F8 AF at center AF point since the center AF point is the most sensitive AF point in all Canon DSLR, but it didn't when launch.... so 6D was out on my next camera list. If they include the F8 AF in the next firmware update, I might be interested now.

   Have a nice day.

140
EOS Bodies / Re: How do I set button to use only center AF point?
« on: March 03, 2013, 08:44:54 PM »
Hi,
   For setting <AF-ON> button, look for it under [C.Fn III: Operation/Others]->[5. Custom Controls]
   For selection of center point as AF, press the <SET> button... you can only change AF-point if you are using Creative Zone mode (Av, Tv, B & etc).

   For details, look up in the manual.

   Have a nice day.

141
Can I make a little objection?
You're talking about resolution, but what about the light sensitivity?
Is it right, that doubled MP would halve the amount of light every pixel gets to see?

Or is the increase of Megapixels always connected to a higher amplification per pixel? (Which would increase noise)

This is what I'm worried about talking about a 24MP APS-C Sensor.

Sorry for Offtopic!
Hi,
    IMHO, I'm not worry about a new 24MP APS-C sensor... I think it should perform better than the current 60D 18MP APS-C sensor.

    I got a Canon G15... a 1/1.7" (7.44mm x 5.58mm) 12MP (4000 x 3000) sensor and the result (noise performance) at ISO 1600 is not that far behind the 60D 18MPAPS-C sensor. If an APS-C sensor base on G15 pixel size, it would be a 90++MP APS-C sensor, so a new 24MP APS-C should not be that bad.

    The attached is the 100% crop shot using G15 and 60D using the below setting:
ISO 1600, 1/6s and F2.8, NR Standard (G15 NR at high ISO cannot turn off when shooting RAW). I process both using the same setting in DPP (faithful, sharpening all set to 0 and NR all set to 0) and export to PS in 16-bit TIFF. Then I crop both in PS, copy, paste and save as jpeg.

   Have a nice day.

142
Hi,
   Err... I don't think this is the same department that in-charge of the camera....

  Anyway, may be Canon use this technology to test their new camera handling... a virtual 7d2?? ha ha ha

  Have a nice day.

143
EOS Bodies / Re: Canon EOS 7D Mark II Spec List [CR2]
« on: February 20, 2013, 12:25:47 AM »
Hi,
What strikes me odd is if Canon makes this camera, it would mean their highest MP camera would be an APS-C format body, not full frame. That just doesn't sound logical, why would they do that? This camera would have a pixel density equal to a 61mp full frame camera, that is far beyond the resolving power of most lenses. I doubt this camera would really come anywhere close to the IQ of the 5DmkIII, that is just wishful thinking, at any ISO.
    This DSLR is not aim at user who image quality is their highest priority... get FF DSLR for that.

    Basically, "Image Quality, Performance & Built and Price"... choose 2 of them:
1) If you want image quality and better price, performance & built will not be good -> Canon 6D
2) If you want image quality and performance & built, price will be high -> Canon 1Dx.
3) If you want performance & built and better price, image quality will not be as good -> Canon 7D.

Anyway, base on my "eyeball" compare, 6D is 2 stop better than 7D in noise performance, so if this DSLR can have 1 stop better than current 7D, I'll be happy.

    Have a nice day.

144
Hi,
    Yes, learn to use the keywords and keyword hierarchies to organize your photo is the way to go. For example, my keyword hierarchies is something like the below:

- *NEW
- LOCATION
  - Country A
    - Location Name
- EVENT
  - Birding Trips
  - Birthday
  - Family Trips
- LANDSCAPE
- PEOPLE
  - Family
  - Friend
- WILDLIFE
  - Birds
    - Bird Family Name
      - Bird Name

   Every photo will have one or more keywords associate with it, so I can use the smart collection to find any photos or create virtual album quickly (for example, all  "Birding Trips" photo I took in "Country A"). Also, all photo that I just imported will have the "*New" tag, so I can use the smart collection to find all photo I haven't tag yet easily and take my time to tag them. Once finish tagging, I'll remove the "*New" tag from those photo.

   As you can see the keywords and keyword hierarchies are very powerful and how to organize it is basically depend on you.

   Have a nice day.

145
EOS Bodies / Re: EOS not good for NASA?
« on: February 13, 2013, 07:47:12 AM »
Hi,
Sorry if I ruined ur post but all I could see was that giant lenscap

    This is the HyperStar ( http://www.hyperstarimaging.com ) imaging configuration which made the 2350mm F10 telescope to a 540mm F2.3 imaging system.

    Have a nice day.

146
EOS Bodies / Re: EOS not good for NASA?
« on: February 13, 2013, 12:09:25 AM »
Hi,
But how does one explain some of the pictures taken from the space station with a 1200mm lens?

    May be they use a telescope...  ;D

    Anyway, they recent install a modified Celestron CPC 9.25" telescope with Canon 7D DSLR for the ISERV (International Space Station SERVIR Environmental Research and Visualization System) project.


(image source: http://www.nasa.gov/mission_pages/station/research/news/iserv.html )

   Have a nice day.

147

What's "100% crop" video?
Daniel

There is a mode on the 60D where you can shoot 640x480 video taken from the 640x480 pixels at the center of the sensor. It's VERY usefull for image stacking in astrophotography....
   Also very good for taking video clip of small birds or birds that are far away...

   Have a nice day.

148
Hi,
   For me, I'm not greedy:
   - Improve AF,
   - Improve low light AF
   - 1 stop improvement in noise over current 7D (but preserve all the noise information like all the current Canon DSLR)
   - 2nd SD card slot
   - 100% crop 1080p HD video
   - the rest can remain same as current 7D including price (hopefully)
   
   Have a nice day.

149
Canon General / Re: Cannon / Nikon Meme
« on: February 09, 2013, 12:40:51 AM »
Hi,
    Wrong colour scheme... it's should be WHITE with RED band... ha ha ha  :P

    Have a nice day.

150
Hi,
    I also shoot birds and using the 400mm F5.6L on 60D... can't afford anything longer or better than that, so IMHO, for budget birder, APS-C is still very attractive.

    Anyway, I plan to wait till May or June and look at the review of the 5D3 F8 implementation, if it's really good, reliable and AF not slow down by too much, I might change to 5D3... 400mm + 1.4x on 22MP FF DSLR will had very similar reach to 400mm on 18MP APS-C DSLR.

   Have a nice day.

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