October 21, 2014, 10:44:45 PM

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Messages - weixing

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16
Third Party Manufacturers / Re: Nikon's 2.300$ D750 said to best 5DIII
« on: October 02, 2014, 08:44:42 AM »
I just have to laugh at most in this thread...

The premise at hand... Comparing a new camera to a camera going on 3 years-old and stating that the new one is improved.

Really.  Shocker?

The fact that it has taken x number of years is the real testament...

But what do we know? 

We do know the 7D MK II is shipping shortly and by all accounts appears again to be the king of the crops.  While some may say its low light or DR are not up to snuff it is much improved over the 7D and the AF system, FPS and general features are tops.

We know that the D800 was a POS and a disappointment... So much so that they released the 810 just about a year later.  I would be pretty pissed if I picked a camera up a few months after release and it was already outdated/replaced in a year.  Talk about taking a HIT on your investment. 

We know Canon looks to have plans for a High MP, 1Dx II and 5D MK IV in the pipeline in the next 3 - 12 months and likely the 1DX MK is announced before end of the year and 5D IV early next year.  Looking the the Digic 6 processors and the buffer capability of the 7D MK II both of these couple see marked improvements in FPS, AF and better sensors. 

Keep comparing to the past, all of these comparisons are moot and passing... Lets see how the 750 compared to the 5D MK IV
Hi,
   I think it might be D799 (Nikon running out of numbers) vs Canon 5D IV  :P

   By the way, I think sales of D750 will not be good... because every Nikon user thinking may be Nikon will be releasing a new model in the next few months...  :P

   Have a nice day.

17
EOS Bodies / Re: Next Rebel Going EVF? [CR1]
« on: October 02, 2014, 08:35:11 AM »
Hi,
    If going pure EVF mean it'll be mirrorless... 2 possibilities:
    1) Replace by EOS M or design a slim rebel and use EF-M mount.
    2) Remain the similar size as current rebel, so can still use EF mount and also a larger capacity battery.

    I hope at least is 2 as EVF need a lot of power...

    Have a nice day.

18
Third Party Manufacturers / Re: Nikon's 2.300$ D750 said to best 5DIII
« on: September 30, 2014, 11:27:03 PM »
Hi,
   By the way, I just wonder is using carbon fibre for the front a good idea?? Carbon fibre is strong, but also will shatter under impact... I had seen quite a lot of drop camera and most of them the lens land first (especially with heavier lens) which mean the mount area of the camera will take quite a lot of impact... just wonder is the D750 front strong enough to withstand the force?? Will the carbon fibre front shatter?? I never see the front of any DSLR crack after a camera drop, so just wonder??  ::)

  Have a nice day.

19
Lenses / Re: What telephotos do we own?
« on: September 27, 2014, 11:22:12 PM »
Hi,
    I had both Canon EF 400mm F5.6L and Tamron 150-600mm.... I mainly use Tamron now and the Canon is my backup lens...

   Have a nice day.

20
Technical Support / Re: Downside Up?
« on: September 27, 2014, 11:18:01 PM »
Hi Folks.
I was out today doing some landscape shots with the camera upside down, came home and put them on the computer, clunky old laptop, where they were displayed inverted.
My question is why were they not displayed up the right way, I have rotation set to computer only on my 7D, shot raw only. Does this setting only affect JPEGs, does it only work for 90 degree rotation, i.e. portrait and cannot recognise an inverted camera?
I checked the software, Fast Stone Image Viewer, which was set to rotate according to exif data.
Is there a way to rotate the raw file, or is this not a good idea due to having to overwrite the original? Is there a way to get it to display upside up!

Thanks for your help.

Cheers, Graham.
Hi,
   Hmm... The question is why do you want to shoot with your camera upside down?? Both are in landscape orientation, so I wonder why you want to do that??

   Anyway, just rotate your image during post processing... you do post process your RAW file, right??

   Have a nice day.

Use the tripod center column reversed to get close to the ground.
Hi,
   Oh... didn't thought of that... :-[

   I don't think any software can rotate a Canon RAW file directly... you had just to rotate in the post...

   Have a nice day.

21
Photography Technique / Re: Noise in 5D III - Concern or my fault?
« on: September 27, 2014, 10:07:38 PM »
Hi,
   I suspect it's might be the "highlight tone priority" as this feature actually shoot in lower ISO and apply a tone curve which will preserves more highlight, but at the expense of increasing shadow noise.

  Have a nice day.

22
Technical Support / Re: Downside Up?
« on: September 27, 2014, 09:45:32 PM »
Hi Folks.
I was out today doing some landscape shots with the camera upside down, came home and put them on the computer, clunky old laptop, where they were displayed inverted.
My question is why were they not displayed up the right way, I have rotation set to computer only on my 7D, shot raw only. Does this setting only affect JPEGs, does it only work for 90 degree rotation, i.e. portrait and cannot recognise an inverted camera?
I checked the software, Fast Stone Image Viewer, which was set to rotate according to exif data.
Is there a way to rotate the raw file, or is this not a good idea due to having to overwrite the original? Is there a way to get it to display upside up!

Thanks for your help.

Cheers, Graham.
Hi,
   Hmm... The question is why do you want to shoot with your camera upside down?? Both are in landscape orientation, so I wonder why you want to do that??

   Anyway, just rotate your image during post processing... you do post process your RAW file, right??

   Have a nice day.

23
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.

24
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.

25
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.

26
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.

27
@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.

28
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.

29
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.

30
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.

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