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Messages - weixing

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76
EOS Bodies / Re: Patent: Improved Cooling for DSLRs
« on: September 27, 2014, 09:41:08 PM »
The image still shows the mirror.  We'll know when their seriously considering mirrorless when it goes away.
I'm in the late 30. I have high hope in canon ff mirrorless will be ready on my retirement  ;D
Hi,
   Just shoot with live view and you got your "mirrorless" camera.  :P

   Have a nice day.

77
Hi,
   Most lens are not design for pin-point light source especially those wide angle lens, so if shoot at wide open and view at 100%, most likely you'll be disappointed... stopping down one or two stops might help.

   Below is a website that might help you:
http://www.astropix.com/HTML/I_ASTROP/LENSES.HTM

   Have a nice day.

78
You are right of course. But, this is a 25 000 iso shot not 2500 iso. Actually it should be 25600 iso, its the 'max' setting of the Eos6d before turning on the even higher so settings, which I haven't even looked at nor used!

Meh, I mis-read that because shooting with iso 25k is outside my imagination :-p ... but in that case, I can contribute another smarta** comment: The max. analog iso of the 6d is 3200 (5d3: 6400), so if you shoot raw you can simply use this and underexpose - otherwise you're again just reducing the dynamic range.
Hi,
   Hmm... Where did you get this info from??

   Have a nice day.

79
Technical Support / Re: Dynamic Range questions..
« on: September 27, 2014, 02:09:22 AM »
Hi,
   One think I don't understand is that how a camera can have more than 14 stops of DR when the camera only record in 14-bits... when you record in 14-bits, shouldn't mean that you should have a maximum of 14 stops and not more than that?? Or they don't record that data in a linear way??

   Have a nice day.

80
@zlatko: It's not about any of that. It's simply data. There are lots of debates that go on about DR. There aren't very many RAW files that people can download and play with themselves. That's all this is about. I'm not trying to push anything with this thread. I'm just trying to provide data. People make decisions. It's useful to have data to back up those decisions.

YES, this is an extreme example. It's not intended to be a totally realistic demonstration. All it is supposed to do is give people who may have questions about what it really means to have more DR the ability to see for themselves. To actually download RAW files that they can open up in their preferred editor, work with themselves, and...see what's what. If some people conclude that more DR does nothing for them, fine. I don't care.

I simply care about providing some concrete data. The DR debate is never going to end until the playing field is level. So it's going to rage on. At least I can provide something people can reference. That's all this is. I am hoping I'll have the opportunity of photographing some landscape scenes tomorrow to provide some more realistic and balanced examples than this. Personally, I'm impressed with how well the A7r holds up under a 5-stop push (especially given it's compression). I don't think that's a particularly common scenario...but the data held up very well, all things considered. For smaller prints, like an 8x10, it's entirely viable.

It won't be any surprise to me if most of the responses to this thread are like yours, this is a Canon community, so it makes sense that people will decry the value of having more DR, defend their preferred brand, and even get hostile. That seems to be the nature of this community (sadly). Well, so be it. There's the data. Shred it as you will.
Hi,
   IMHO, I think a lot of Canon users know that DR of Canon camera is not the best and know the importance of DR, but they also try to point out that there is a lot of aspect that make up of a good camera not just DR... there is no perfect camera out there, so there is always some compromise when choosing a camera or camera system.... may be many user just don't put DR high in their priority list... 

   Also, IMHO, many users here get annoyed not because they want to defend their preferred brand (in this case Canon), but the fact that some of you keep bring up the same thing again and again in thread that are not related to DR.

   Just my S$0.02 and enjoy your new toy... I mean camera...  :P

   Have a nice weekend.

81
Hi,
   IMHO, Canon will still R&D their own sensor especially the dual pixel sensor even if they currently buy sensor from Sony. Canon already show that they had the ability to design very sensitive sensor, very high resolution sensor and very large sensor, so I had no doubt that Canon had the ability to produce a competitive sensor, but unlike Sony, Canon don't had a division that sell sensor components, so it's all depend whether do they think that is it viable to do it.

   Have a nice day.

82
Landscape / Re: Deep Sky Astrophotography
« on: September 26, 2014, 08:57:20 AM »
Unmodded Canon 5D III, with 600mm f/4 L II lens. A big part of getting this kind of result is the software I use to process: PixInsight. Powerful, powerful tool.

I use an Atlas EQ-G tracking mount, along with a specific set of rings and dovetails to hold the lens onto the mount. I'll post some photos of my current setup in another thread, so those of you interested in getting started can get an idea of where I'm at, and what options there are at a lower cost.
Hi,
    Your sky must be very good to get that result...  :)

By the way, you said you previously use the Astronomik CLS filter, how to you solve the colour shift issue?? Last time I use the CLS filter as my area light pollution is very serious, but had big problem solving the colour shift issue...  :-[

    Have a nice day.

83
Landscape / Re: Deep Sky Astrophotography
« on: September 26, 2014, 03:59:01 AM »
Awesome shot Jon. Nice work.

Another fantabulous image!  ;)

Thanks, guys. :) Glad you like. One of my best so far. Data on that one was so good.

I'm trying a new technique. I used an Astronomik CLS filter most of the year, but it is making it really hard to get images quickly. I have so few clear nights, and I need to image for several nights to get enough subs to produce the kind of quality I got in the Elephant Trunk...that I'm trying to image without the CLS filter now. It results in more complex work in post, but...if you can work through it, you get stuff like this:



Compare that to my first two attempts at Pleiades from the original post of this thread. :D One thing I really do love about the 5D III? It's huge full frame...has a really wide field, which is just awesome for images like this.
Hi,
    I assume this is taken by 5D3... Did you mod your 5D3??

    Have a nice day.

84
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.

85
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.

86
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.

87
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.

88
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.

89
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.

90
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.

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