September 02, 2014, 12:26:55 AM

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Messages - weixing

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76
Hi,
    Wow!! Excellent shot!!



Fabulous! I suppose you used flash for these as well?

No flash, just 135L + 5D3 and shoot a lot
Started with 85L but that was just hilarious :).

Fun stuff I noticed when looking at the result was that with 6fps the birds still would be able to leave the frame entirely between 2 burst shots.
    May be you are just too close... ha ha ha  ;D :P

    Have a nice day.


   

77
Third Party Manufacturers / Re: Best Nikon DF Review! By Fstoppers.
« on: January 26, 2014, 08:34:58 PM »
Hi,
    If Canon coming out a retro DSLR, hope they don't just only go for the look.

    Anyway, I thought the Powershot G15/G16 already have the retro camera looks and are very usable ergonomics... may be Canon should just use the PowerShot G15/G16 design and make a interchangeable lens version... may be on the next EOS M.

    Have a nice day.

78
EOS Bodies / Re: EOS Camera with MF Peaking??
« on: January 25, 2014, 01:09:43 PM »
I assume they were referring to the Cinema EOS cameras - the EOS C100, EOS C300, and EOS C500 offer focus peaking, zebra bars, etc.

Also allow me to preempt Marsu42 and state that Magic Lantern adds focus peaking to EOS still cameras for which the ML firmware is available.   ;)
Hi,
    Oh... I thought there is some settings that I miss out...

    Thanks and have a nice day.

79
There are two diff. markets, Pro and everyday shooter. The Pro will cont. with DSLR and wonderful L lenses.

Not true. Many professional photographers are using mirrorless systems.

IMHO, don't need to worry for Canon... they already had the technology to come out a good mirrorless camera anytime...

IMHO, I don't think so. Both Canon and Nikon have been in the SLR game so long that they have millions tied into research and development that has not yet paid for itself. The insistence by Canon to slap IS into basically any new lens is proof of this assumption. This also means that they have been spending a lot of dinero on perfecting this technology, instead of simply binning it in favour of new ideas.

I do not believe Canon and Nikon are "past their prime" ...

As far as the "enthusiast" segment goes, yes, both Canon and Nikon are past it. I agree with you that both companies are severely missing out on a very lucrative market.

... so I think CaNikon are just biding their time.

Personally, I have my eye on either the Olympus E-M10 or the Fujifilm X-T1 for my non-super-telephoto stuff ... as neither Canon nor Nikon has anything to compete with these cameras. Once I've bought into either (non-Canon) system, I also won't be contributing to Canon's profit for a time.
Hi,
    There is no need to research in mirrorless camera for Canon or Nikon. When you shoot in live view, you are actually using a "mirrorless" camera already... just without EVF. With dual pixel AF, Canon had all the technology to make a reasonable fast mirrorless camera anytime...

    Actually, I would prefer them to make a hybrid system... put an EVF behind the prism, so you had a setting that enable the EVF to turn on when the mirror is up and you can lock the mirror in up position if you prefer to use the EVF, but I guess if this going to happen, it'll happen to the 1D series... not a camera I can afford... ha ha ha.

   Have a nice day.

80
EOS Bodies / EOS Camera with MF Peaking??
« on: January 23, 2014, 11:56:45 AM »
Hi,
   Do anyone of you know is there any EOS camera that had MF (Manual Focusing) peaking??

    I was reading the DIGIC 6 image processor page and in the MF peaking section, it's mentioned that "with MF Peaking, a concept inherited from EOS cameras", so I just wonder which EOS camera had it?? My 60D and 6D don't have it.

   Have a nice day.

81
Hi,
    IMHO, don't need to worry for Canon... they already had the technology to come out a good mirrorless camera anytime... the big question is when?? If you ask me, my guess is this year or next year you'll see a higher end mirrorless camera from Canon.

    Anyway, mirrorless camera is not for everyone especially for wildlife photographer when many of them like to use their super telephoto lens as a scope...  ;D Battery will use up very fast on a mirrorless camera if use this way.

   Have a nice day.

82
Does anyone think Canon is reading this stuff because I am baffled as to why they would cut shot the DR and cheat on RAW's with fast lenses.
Hi,
    IMHO, commercial product don't push their product to the limit... they usually hold back to ensure reliability... it's just like computer when you can overclock the processor on your custom made PC to the limit, but most major brand PC manufacturer won't overclock the same processor on their PC to that limit.

    Have a nice day.

83
Hi,
    Thanks for the review... Look like I'm going to order one to replace my EF400mm F5.6L once it's available in my country.  ;D

    Have a nice day.


84
Helpful, but the two things I really wanted to know weren't answered:  How effective the VC is while panning, and how much it improves at 600mm when you stop down to f/7.1 and f/8.

http://translate.google.com/translate?hl=en&sl=auto&tl=en&u=http%3A%2F%2Fqicai.fengniao.com%2F425%2F4259287_all.html

Whatever that is, it triggered AVG for a web-based exploit.


What does the chart represent? sharpness?

If I understand it correctly, it's your typical Imatest result like on Photozone. The ordinate is LW/PH.

I can't tell if it's center and edges, or center and corners, or center and average. But they go on pretty close, so it doesn't really matter. It's just good :)

I think they used a 5D MK III. As an approximation based on other available imatest data, 600mm f/8 is very, very close to the 100-400 L at 400mm f/5.6. Only very slightly worse, if you consider the error margin.
I see ... thanks
Hi,
   The dark blue is horizontal resolution and the light blue is vertical resolution base on the test chart (red box scale area).

   Have a nice day.

85
EOS Bodies / Re: Will Canon Answer the D4s? [CR2]
« on: January 18, 2014, 10:21:47 PM »
Jrista, without quoting that long post...do you honestly think it's possible for a DSLR to have its sensor cooled to -80 C?  How would that be done in a DSLR?

Active cooling is actually done quite frequently today with high end astrophotography cameras. They use dual stage peltier (TE/TEC, or ThermoElectric) cooling. Peltiers are very thin electronic heat pumps, being simply an array of N and P type silicon sandwiched between two ceramic plates (one "cold" plate and one "hot" plate, heat is pumped from the cold side to the hot side). It would be easy to fit a peltier into existing DSLR bodies without anyone being the wiser (with the exception of increased heat output, as the peltier generates it's own heat along with drawing out heat from whatever is attached to it's cold side.) Now, with most astrophoto cameras, the delta-T they aim for is around 50°C. On an average night, the temperatures drop to somewhere around -10° to -20°, however the really high end ones can cool much more effectively with delta-T over 60°. On a cold night, CCD temp with a really good astrocam can get to below -75°. Most cooled astrocams also employ low noise fans to actively cool a heat sink or heat pipe attached to the hot side of the upper peltier and actively exhaust heat...something similar could be done with a DSLR.

Professional scientific grade CCD cameras used in professional astrophotography, microscopy, etc. use much more significant measures to cool. Professional scientific grade CCD cameras are usually cooled to at least -80°C. In some cases, temperatures are pushed below -125°C, and I've even heard of some scientific grade equipment operating in superconducting conditions at nearly absolute zero (however once you move past -80°C, the cost of maintaining temperature becomes excessively prohibitive.)

In the case of a DSLR, at some point I see some kind of peltier based cooling becoming necessary. At some point, we are going to exhaust the material options, when we've employed things like black silicon, color splitting in favor of color filtration arrays, and maybe even some kind of layered photodiode approach to increase maximum charge capacity per pixel. To continue improving (and at that point, low ISO will be about as good as it can get, so all the improvements will have to occur at the high ISO end), without reducing megapixel count, we will need to reduce dark current noise in the electronics themselves. The most effective way to reduce dark current once CDS is employed is to cool the sensor.

Even for a relatively cheap $2000 astrocam with dual-stage peltier cooling, average dark current drops from around 5e- to 0.02e-, and better ones can be had for $4000 to $10,000 where dark current drops to as little as 0.01e- to 0.008e-. At 0.01e-, you release one electron worth of noise for every 100 electrons released by photons. Today, average read noise at high ISO is around 3e- or so, so cooling could gain us a fair amount of real-world high ISO sensitivity. Even at medium ISO settings, where dark current can still be as high as 5-10e-, could benefit from cooling. Extreme cooling could even be an option to reduce ISO 100 noise as well, albeit at a power cost.

On the notion of power consumption, that would certainly be a hurdle to overcome. Power cells would have to be far more efficient, and certainly hold more capacity, than even the most capable camera batteries of today. I suspect some kind of fuel cell technology would need to be employed to make extreme peltier cooling a reality for high ISO shooters. Fuel cell tech has come a long way recently, and I suspect at some point camera manufacturers will probably switch to them anyway. Thermoelectric cooling could be a user-selectable option as well, and the peltier could be activated automatically on demand if it is enabled so that it does not constantly draw power.
Hi,
   There had been quite a few DSLR out there with active cooling modification, the result was very good with very low noise, but it's quite bulky. Also, with active cooling, you will have condensation issue unless you sealed your DSLR and dry the air inside like adding an dehumidifiers.

   Have a nice day.

86
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: January 17, 2014, 12:33:38 PM »
I had the pleasure of trying one out and using it this afternoon, - it's in the UK shops folks! LCE pricing it at £1170. It was about the same size roughly as my old Canon 100-400 L lens, the weight was much as I expected it to be, - considerable heavier than my current 400 f5.6L, but not a problem, I hand-held it on a 7D to take a number of shots, it felt nicely balanced and the IS worked well. It focused very swiftly without hunting despite fading light. In short, I want one! But here's the dilemma. I've been told that if I use it on a F/F body the images might be soft at the edges. Someone else said there could be distortion at the edges of the images used on a F/F. Both advised that being an independent brand it might be better to use it on a crop body, despite perhaps, a lower IQ and/or more noise from a cropped sensor. Even more disappointing was the advice to go for the proprietary brand equivalent-range lens on a crop body rather than risk the Tamron, - and this from a sales rep. who was going to be selling it! Whilst I could happily accept the advice to go for the crop body, (if I was really to gain from that, - greater reach but more noise or lower ISO ceiling as against possible soft edges or distortion using a F/F body), being advised that the manufacturers' own lens would be a better bet in respect of IQ (at double the cost) deflated me somewhat, given the hype been given to this lens, and the affordable price. And the sales reps. advising me hadn't tried it for themselves of course. Indeed they might not have personally tried similar long lenses on both crop and F/F bodies to be able to justify their contention. Would be interested in other's ideas on this, before I commit!
Nice shop to avoid....
The lens could be soft at the edges.... unlike the 100-400 which is renowned for a razor-sharp image across the entire view.... NOT!
They say the lens works better on a crop body?!?!?!?!? That would definitely be a first for Tamron if it were true...
Use an equivalent range zoom lens????? Did they say who makes one? How come nobody else knows of an equivalent lens?
And all this from people who have not tried the lens.... WOW!!!!!
Nice shop to avoid!
Hi,
   Of course this lens work better on a crop body... eqv. 240-960mm with AF...  :P

   Anyway, base on the limited online review, I expected this lens will have vignetting at 600mm wide open on FF (I suspect this is the case when they announce that the lens include an image processing software) and I also don't expect it to be sharp at the corner at 600mm on FF also... at this price, I can live with that as long as image quality and AF is good at 600mm...

   Probably will get this lens to replace my 400mm F5.6L + 1.4x TC for birding.

   Have a nice day.

87
EOS Bodies / Re: Hybrid Viewfinder Coming To Canon DSLRs? [CR1]
« on: January 16, 2014, 02:29:12 AM »

It's a Bower. I think it's the same generic brand as Rokinon/Samyang.

It may not be the Bower TC that causes the IQ loss. I mean, it will cause some, but the 100-400 sucks even with the EF 1.4x III (which it doesn't even function properly with), and while it functions properly with the much-loved Kenko Teleplus Pro 300 GDX 1.4x TC, the IQ still sucks (a little bit more than the Canon 1.4x, but the differences aren't huge.) I think it's just that the old 100-400mm lens design was built in the film era, at the early dawn of the digital era, and the bar for quality wasn't as high back then. It is most definitely a softish camera at f/5.6 and f/6.3, and only really starts to sharpen up by f/7.1 and f/8. With a TC, you would be at f/11, which imposes a significant hit on either shutter speed (which increases softness from camera shake) or ISO (which packs on the noise, especially on a 7D).

It is possible that your $80 Bower TC is just fine, and that it just doesn't pair well with 100-400 (because, well, NO TC pairs well with that lens. :D )
There's probably something to do with the age of the 100-400 and its dislike of TCs, but I've tried the Bower TC on my old 28-135, and the TC definitely degraded the sharpness there too.  Maybe I got a bad copy.  I imagine the Kenko brand is a tad better than Bower.  I hear the Bower/Rokinon/Samyang conglomerate makes fairly good lenses, so maybe they just don't make good teleconverters.  It's probably very difficult to optimize a teleconverter for a bunch of very different lenses.

The Kenko is decent, but it is definitely not as good as the Canon TCs. It allows just barely visible improvements when attached vs. when not attached. Subjects are definitely larger in the frame, but you don't get the same kind of increase in overall detail as with a Canon TC.

Something else I've noticed with the Kenko TC...boke circles look TERRIBLE. They have this funky warped star effect which just looks rather bad, so I don't really use it much anymore. It's great though, for people who want f/8 AF on camera bodies, like the 7D, that don't normally support it (so the boke issue just doesn't matter in those cases). It does allow f/8 AF, and in good light, even the 100-400 will focus automatically, albeit slowly.

If you have a good lens, and a body that supports AF at the smaller apertures, get a Canon TC. No question they offer better quality. If you have a body that does not support f/8 AF and you need it (probably best with the 400/5.6 L prime), the Kenko is the best bet. (Actually, the Kenko MC4 seems to produce better IQ overall than the Kenko Pro 300 DGX, so I actually recommend getting that one...I simply couldn't find one for sale when I bought mine.)
Hi,
    I use the Kenko Pro 300 DGX 1.4x (blue dot version) on my 400mm F5.6L and 6D all the time and the bokeh look normal to me... focusing speed is only slightly slower. Anyway, bokeh is cause by the aperture blades, right? So the quality of the bokeh should be determine by the lens design.

   Have a nice day.

88
Lenses / Re: Get a 300mm or 600mm? Oh the agony...
« on: January 12, 2014, 09:40:36 PM »
I do have 1 question, does anyone have a Moon shot with the 600mm by it's self and a Moon shot with the 600 and 2X? I can use this in a way to gauge my reach. I would love to do some Moon shots and there is a full moon comming up on the 16th of Jan. I will be using my 70-200 with a 2X this time around to give me an idea on how much more reach I want to achive.
Hi,
    Hmm... Full Moon at high magnification don't look nice... the surface contrast is very low during Full Moon, so the image will look flat.

   Have a nice day.

89
But they have no right to sell that many cameras until they increase DR. This is just madness, did no-one tell the rest of the world that Canon is using horrible old tech?

Ahem.

It's cool to see mass automation actually being implemented, hopefully more industries move in this direction.
Hi,
    May be the rest of the world don't actually see the different?? May be the improvement is not as big as we thought?? May be there are other features in Canon camera that are more important and better than other brand?? May be they just don't believe those who doing the testing... just like NASA said that they send human to Moon with pictures and videos, but there are still a lot of people don't think so...

   Have a nice day.

90
Hi,
   Good for all as long as the Japanese government don't do anything stupid again to provoke one of the world largest market...

   Have a nice day.

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