August 04, 2015, 08:17:19 PM

Recent Posts

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61
FoCal reported EVs of ~15
EV of 15  ??? Just how much light is that:o
With two 400W floodlights (work lamps) I get barely EV 12, as I recall.
62
+1 for weather sealing

Also hope they make it for FE mount for Sony.
63
Lenses / Re: I used the Sigma 24-35 F2 over the weekend
« Last post by wockawocka on Today at 02:51:09 PM »
Thanks for the review. Interesting read. I am a bit puzzled though. I have been through a number of 35 and 50 Art lenses, with very inconsistent AF. I am currently on my third 50 Art copy, which I have not used enough to judge.

How can Sigma then suddenly deliver a zoom lens with AF that apparently outperform a couple of (classic) Canon L-primes?

My 50 art was great straight out of the box but yes there are reports of problems with it. So far my Sigma experience has been pretty good.
64
Nope.  Many computation problems are either impossible or very inefficient to do in parallel.  You also can't take your second point ("paying the same price") at the same time as "more processors of the same level or model".  Not only are you not going to get more processors for free, they require more space, more power, more connections, more everything.  It is not at all clear that more processors is the ideal approach.

A general purpose processor can, given enough time, pretty process anything. One very simple way to use parallel processing in a camera design is to use the processors as stages in a pipeline. eg the first shot uses the first free processor, while a second shot can start using another processor while the first is still in progress.

I do not know what architecture Canon use in the DIGICs, but I would not be surprised if it follows this model - not least because it is an architecture where adding more chips can be used to add more FPS or larger larger burst sizes.

However, the price you pay for this is power consumption (battery life), which rises linearly with the number of cores actively being driven.   

General purpose CPU cores are always less power efficient than dedicated circuitry, so an alternative is to add more specialised circuitry instead. This gives a better performance and power consumption, but is less flexible and harder to get right as it fixes the algorithms in hardware (not Canon seem keen to provide feature updates in firmware anyway).

In short there will be a balance between the number of cores and the dedicated logic, which will largely be driven by engineering, time and cost constraints. A large number of cores does not automatically mean a faster processor (but it certainly means a more power hungry one).

So instead of worrying about how it works, worry about how well it works and ignore the marketing hype...
65
EOS-M / Re: Pick 2: Your next most desired EF-M lenses
« Last post by rrcphoto on Today at 02:45:54 PM »
frankly i see primes as being idiotic.  if i want a small package the last thing I want to be doing is swapping between two or three primes with a mirrorless camera that exposes the sensor to dust, dirt,etc every time i swap a lens.

it certainly needs a 18-135 somewhat collapsible zoom, a macro and really some better ranging zooms such as a 18-200 but small (even if it has to go to 6.3).

66
Rusty,
That' s basically, the guns don't kill people, people kill people argument.
My answer is that idiots with guns kill people.  So let's try to keep guns out of the hands of idiots.
Licensing and registration should not be a problem for responsible gun owners. Sensible gun control legislation works, the UK response to Dunblane and the Australian response to Port Arthur have shown that.
More laws won't eliminate the problem,but they certainly reduce the problem.
67
EOS-M / Re: Canon EOS M3 Coming to North America? [CR2]
« Last post by rrcphoto on Today at 02:42:31 PM »
events where the sun is out and the LCD would be a disaster to view. Last thing I want to do is carry around a big magnetic loupe for a camera that is supposed to be portable. It really needs a built in EVF, even if at the expense of a smaller LCD rear screen.

never had to do that with the M, and certainly not the M3 with the EVF - and one of the cameras is full spectrum and only comes out in the brightest of light.
68
Canon EF 200-500mm f5.6 that works on a 6D with extenders - yes please ;-)
69
EOS-M / Re: Canon EOS M3 Coming to North America? [CR2]
« Last post by roxics on Today at 02:32:59 PM »

Most wouldn't know it's 'relaunched'.   Hopefully people here won't find the '3' confusing.  If you recall the film, The Madness of King George from the mid-90s, it was test-marketed as The Madness of King George III, because George III, played by Nigel Hawthorne, was the protagonist (he reigned during the American Revolution).  But the testing marketing indicated people would not go see the film because they hadn't seen the two previous installments in the film series (The Madness of King George I and The Madness of King George II).   We're not big on history here.   ;)

While it's a nice story, it's also not true. Look it up.

I've always thought the EOS M was cute. Especially in the stormtrooper white/black color and I'm not a big colored camera fan.  I've almost pulled the trigger a couple times at the >$300 price point. But even then I backed off because of the lack of lens selection and knowing that a camera like this I would mostly use out at fairs and events where the sun is out and the LCD would be a disaster to view. Last thing I want to do is carry around a big magnetic loupe for a camera that is supposed to be portable. It really needs a built in EVF, even if at the expense of a smaller LCD rear screen.
70
Regional Boards / Re: Switzerland
« Last post by neuroanatomist on Today at 02:27:53 PM »
Here are a couple of the iconic Chapel Bridge in Lucerne:

"Kapellbr├╝cke"

EOS 1D X, TS-E 24mm f/3.5L II, 30 s, f/5.6, ISO 100 (10-stop ND + CPL)


"Kapellbr├╝cke at Night"

EOS 1D X, EF 24-70mm f/2.8L II USM @ 50mm, 20 s, f/11, ISO 200
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