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Messages - weixing

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136
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.

137
EOS Bodies / Re: EOS not good for NASA?
« on: January 15, 2013, 08:01:39 PM »
Hi,
    I think they do use Canon EOS, but just not in space.

http://www.popphoto.com/gear/2011/07/how-does-nasa-get-nikon-d2xs-ready-to-go-to-space

    Anyway, this photo ( http://www.nasa.gov/images/content/565184main_jsc2011e040349_hires.jpg ) you mention is taken with a EOS 5D II (So they may be use Nikon to take photo of space and Canon to took photo on Earth?? ha ha ha :-P ). If you look at NASA image archive ( http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/multimedia/preflight/Image_Gallery_Collection_archive_38.html ), you'll see quite a lot of them taken with Canon EOS (5D II, 7D & ID4).

    Have a nice day.
   

138
Hi,
Good to hear the problem's solved.
This is now getting off topic, but I'd like some advice/comments please. I've never actually used LiveView in any real way. So here's what I need to know:
I want to go out and photograph star trails, you know the kind, several hundred shots stacked to make to final image. Now if I set my camera for 30second exposures, continuous shooting and lock my cable release, it'll obviously keep taking shots until a) I tell it not to or b) the battery runs out.
The question: If i use LiveView to focus and avoid all those nasty tremors and slaps, will the screen stay on all the time and drain my battery? Can I tell it not to stay on?
I'm shooting a 7D.
    What you should do is switch to manual focus, focus manually via life view and then turn off the LCD during actual shooting. You don't need life view or mirror lockup for long exposure, so off the LCD which will preserve battery power and reduce the heat generate by the LCD (improve noise performance).

As the 7D has a top display, so while taking the photo in live view, the rear screen will display nothing.

However, astro photographers normally uses stacking in combination with a motorised equatorial mount - that way each shot will be of the same bit of sky with no motion blur of the stars, and the stacking software puts the frames together to reduce noise and increase the detail of the stars.

Star trail photos are made with very long exposures - just put your camera in bulb mode for that type of shot.


    The ideal way of taking Star trail is to use a single long exposure via bulb mode, but using DSLR, we can take the digital way... by taking many part of the trail using shorter exposure and then combine them together to form a single trail... the different is not obvious if you plan it carefully, the lens is wide enough and you don't 100% pixel peek. The advantage of this method is that you can limit the noise and you still can take a long star trail if your sky is quite light polluted.

    Anyway, IMHO, 30s is still a bit too short for this type of shooting unless he don't have an external timer controller.

    Have a nice day.

139
Hi,
    On more advantage for live view over mirror lockup is that with mirror lockup, you can't prevent or limit motion blur cause by subject moment, but with live view, since you can see the subject (at 10x), you can took the shot at the moment when the subject is perfectly stationary... good for birding at low light without flash...  ;D

   Have a nice day.

140
Hi,
    IMHO, if you don't need very fast AF, the 70-200mm F2.8 IS II + 2xIII is a better option.

    Have a nice day.

141
EOS Bodies / Re: What will be the issue with the 6D
« on: November 24, 2012, 01:35:23 PM »
Hi,
Really, the only problems I have are 3 things. The wifi is small, and either won't work for long ranges, or will drain too mush battery. The gps will be like new apple maps, because, it's experimental. And lastly the buttons, the original 60d's buttons were horrible, so I'm a little upset they are throwing the 6d in a 60d body.
    I own a 60D and I actually prefer the 60D buttons (those beside the top LCD) compare to 7D buttons. One button, one function... clean and simple.  ;D

   Have a nice day.

142
EOS Bodies - For Stills / Re: 5D mark III or 7D and 5D mark II
« on: November 20, 2012, 12:38:30 PM »
Hi,
    I'm currently using a 400mm F5.6L and 60D for birds photography and I'm also consider changing to a FF (I'm thinking of 6D), so here is what I think at the moment.

     The advantage of FF is better image quality, better high ISO performance and better low light AF (both 5D3 and 6D had better low light AF than current crop sensor DSLR on paper), but the disadvantage is "lesser reach". Also, with a crop sensor, you are using the center "sweet spot" of the lens image circle, so your image is relatively sharper across the entire image compare using a FF.

    With a 1.4x TC on 5D3 or 6D (on paper, 6D had better low light AF at center AF point than 5D3, so hoping it'll get F8 AF), you get closer to the "reach" of a crop sensor, but with a 1.4x TC, your AF will be slower which is not good for birds photography... now, the question is how much slower?

    So I'm waiting for the 7DII specification to be out before I decide. Hopefully, the 7DII will have better low light AF and 1 to 2 stop better high ISO performance than current model... if not, I might change to a FF if F8 AF is not that slow.

    Just my $0.02.

    Have a nice day.

143
EOS Bodies - For Stills / Re: 5d2 vs 6d
« on: November 19, 2012, 06:46:41 AM »
Question - if you're going to be shooting at -0.5EV or lower then wouldn't you be using a tripod and or flash? Those low levels of light require long shutter speeds unless you use very high ISO? Correct? Why not use MF with live view? Is AF really necessary? Are you trying to capture candid shots of people?

Sure it would be awesome to use AF in low light but photographers have been capturing images for years without that ability.

I'm just curious.
Hi,
    For example, you want to capture the children blowing the candles in a birthday party with only the light from the candle or may be event or performance at the night where flash are not allow and light is low. With low light AF capability, the success rate will be a lot higher.

    IMHO, if the low light AF work as advertise and high ISO as good as the 5DIII (which I expect it will as it's had a large pixel size), I think this camera will sell very well... IMHO, a lot of people don't need that many AF points, just one super AF center point will be enough for many.

    Have a nice day.

144
Hi,
After all the rebates, it's 199 from B&H, I think I'd be insane to not get this as I cannot get calibrated to my only local lab as well as I'd like. I use Epson 3880's at school off and on with impeccable results but I don't always have access.

Hmmmmmmmm….
    Now most printer manufacturer don't sell printer, they sell ink... ha ha ha

    Have a nice day.

145
Hi,
   IMHO, once you have life view, video is just a software feature that can be easily add in... the additional hardware cost for the video is actually minimum (only mic). By removing video, you only save firmware space, but lost a huge advantage in marketing... unless they can come out with a feature that is desire by still photographers to replace the video feature. Hmm... may be an advanced RAW image processing module (like an embedded DPP or Photoshop plugin) with the space left by the video module in the firmware memory... better if the camera can have two type of firmware, one is with video and the other with the DPP plugin... let user decide ;D

    Anyway, once you included a feature, it's hard to remove without user complaints... look how many user complaint when Canon remove the micro adjustment feature from the xxD and I was one of them.

   Have a nice day.

146
EOS Bodies - For Stills / Re: 1Dx ISO100 high DR shadows SNR improvement
« on: November 14, 2012, 11:31:34 PM »
Hi,
    This method is commonly use in Astrophotography to reduce noise (mainly to reduce random noise) and improve image quality.

    By the way, Panasonic had this feature built-in in some of their compact camera. 

   Have a nice day.

147
I can confirm I am having the same issue. 

I am using a HP Z800 workstation (Just in case it matters - Dual Xeon's - X5570, 12GB ECC RAM, Quadro 5000, Intel 320 series SSD, Intel USB2.0).  My Z800 was running Win 7 Pro 64-bit with no issues.  I deleted the partition on my C Drive on my Z800, then formatted it, then clean installed Win 8 Pro 64-Bit.

The 5D Mark III is detected fine in Windows, no errors and listed correctly. 

I have tried setting the program as 'run as an administrator'. I have also tried running in all the Compatibility modes.  I have 9 USB ports on the Z800, I have tried all of them.  I have also tried running off a powered USB Hub.  None of these things helped, the issue is still there.

I believe this is likely to be an issue with the Canon software and we will need to wait for an update or new version from Canon.

Happy to be proved wrong of course :)
Hi.
   Since it's work on Windows 7 64-bits, but doesn't in Windows 8 64-bits, I think it's a Windows 8 issue. If I were you, I won't be the first to use any new OS... most OS always have issue during initial released.

   By the way, I run the Windows 8 Upgrade Assistant on my Computer and I was surprise to see that it's mark "Microsoft Visual Studio 2010 Professional " as not compatible. If "Microsoft Visual Studio 2010" is not compatible with Windows 8, I wonder how the software it's develop will be able to compatible with Windows 8??

   Have a nice day.

148
Lenses / Re: do image stabilisers decrease image quality?
« on: November 09, 2012, 09:22:04 AM »
Hi,
   For those who interested in Canon lenses, you can download the Canon lens book "EF LENS WORK III" from the below website:
http://www.canon-europe.com/Support/Documents/digital_slr_educational_tools/en/ef_lens_work_iii_en.asp

   This is the Sep 2006 edition, so no information on the latest Canon lens, but very interesting to read.

    Have a nice day.

149
Lenses / Re: do image stabilisers decrease image quality?
« on: November 08, 2012, 08:33:23 PM »
Hi,
    WOW! Still discussing on this... we must be very bore while waiting for new Rumors... ha ha ha   ;D I'm also very bore while waiting for "news" on 70D or/and 7D2...  :(

    Anyway, the OP questions about IS consist of 2 parts:
1) Does the IS action affect IQ?
    I agree with what Mr Bean mention below.
My feeling is that IS would affect IQ as the lens or lenses in the IS unit are moved off center, to negate movement of the photographer. This process of moving the lenses off axis in the optical path would have been "allowed" in the design, but it'll be a case of "....the lesser of 2 evils".

 2) Does the extra elements in IS affect IQ?
     This questions also consist of 2 parts:
     a) Does IS increase the elements in a lens?
         This is a very difficult question to answer since I'm not an optics designer, but base on the trend in the lens specification:
        Lens with IS had more elements than similar lens without IS. For example:
       - EF 70-200mm f/2.8L IS USM has 23 elements, but EF 70-200mm f/2.8L USM only had 18 elements.
       - EF 70-200mm f/4L IS USM has 20 elements, but EF 70-200mm f/4L USM only had 16 elements.
       
     b) If IS does require more element, does the extra element affect IQ?
     From the other thread, "Can a UV filter affect IQ (sharpness) on a lens?", most of poster agree that a filter does decrease IQ to a certain degree, but the decrease in IQ is negligible if the filter is a very good one. So if adding a filter does decrease the IQ, so does every element in the lens since a filter is also consider an optical element (even air in lens is also consider as an optical element).

     By the way, IMHO, using modern coating and manufacturing technology, the decrease in IQ cause by a few extra elements is very minimum, but you gain 3 to 4 stop of advantage with IS, so it's great to have IS as long as it's does not increase the price tag by a lot... ha ha ha  ;D

    Have a nice day.

PS: Where my 70D or/and 7D2 rumors!!  :(

150
Lenses / Re: do image stabilisers decrease image quality?
« on: November 07, 2012, 07:13:37 PM »
Hi,
    IMHO, every element added will decrease IQ by a bit, so a lens without IS will have slightly better IQ than lens with IS (when both lens are from the same generation and same grade) under perfect shooting condition. The decrease of IQ is minimum using modern coating and lens manufacturing technology, so the advantage of IS outweigh the decrease in IQ.

    So the question is: do you want some of your images to be very sharp (no IS) or most of your images to be sharp (with IS)? I think most of us would prefer the IS.

    Have a nice day.

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