October 31, 2014, 06:16:13 AM

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Messages - heptagon

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1
Lenses / Re: Why does a 2x TC lose 2 stops?
« on: October 29, 2014, 10:49:11 AM »
The reverse is also true: A 0.5x TC gains 2 stops.

Those are usually sold as speed boosters to use a full frame lens on a crop camera. If i recall correctly, some lens designs with a wide angle and a large aperture have such an element built in.

2
Lenses / Re: Review: PowerShot G7 X via DXOMark
« on: October 27, 2014, 02:59:15 AM »
Canon, do you hear us? We want a 50MP high DR Sony sensor in a 6DII body for 2500$. It doesn't need many focus points, it doesn't need the best low light performance, it doesn't need to be fast. We want many good pixels at ISO64 and an EF mount.

3
Joining the bandwagon: 6D first.

a) buy it with the 24-105 kit, to get a cheap and useful zoom, b) buy the tamron 24-70 f/2.8 VC to get a good versatile zoom for a reasonable price, or c) buy the canon 24-70 f/2.8 II if you want to go expensive.

The 7DII isn't even out yet and the focusing system ist the only big advantage.

4
Lenses / Re: Thoughts on Having a 35 and a 50 on Crop?
« on: October 11, 2014, 10:31:33 AM »
You're just shooting 50 and 85mm. Think of the conversion, not what says on the lens.

This is not true. You still need to consider actual focal length. Just because there's a crop factor it does not change the actual focal length of the lens. There's a big difference in distortion between 35mm on a crop and 50mm on full frame. The field of view will be similar but the 35mm is still a 35mm, regardless of the size of the sensor behind it.

These two configurations produce _exactly_ the same image (same distance to subject, same shutter speed):
Full frame: 56mm, f/3.2, ISO250
Crop: 35mm, f/2.0, ISO100

The advantage of full frame is you have lower ISO available, faster f-stops available and more field of view available.

The advantage of crop is you use the center part of the image, so you get better bokeh but less blur for a frame filling subject. You also get a longer reach and better edge sharpness. Additionally when using crop lenses, you have lower cost and weight.

Using a big sensor camera has only advantages once you get faster than about f/1.4-f/2 on the current model because faster lenses cannot be made easily. Instead it is easier to increase the sensor size and image circle and use a sharp f/2.8 lens on a medium format camera instead.

5
Canon General / Re: seeimpossible.usa.canon.com?
« on: October 07, 2014, 12:10:20 PM »
So, if I read this correctly, Canon have given up trying to compete with other manufacturers technology, and instead are going to focus on stories about how their customers "use" the products they make as a sales pitch?

Great. So we can expect smoke and mirrors but no substance.

It is like a fashion house deciding to focus not on being the cutting edge of fashion, but rather on how their customers were their garments in everyday use.

Where does Canon say that exactly? :o

You have to read what they don't say.

In the last years Canon never said they'd give us better low ISO performance (or that anyone buying their cameras cared).

Canon seems to be able to sell inferior technology at a premium price. I wouldn't be surprised if they start selling rebranded Nikon cameras with a EF mount and a firmware that provides Canon ergonomics.

6
After 25 pages this thread is starting to provide some useful information. How disappointing. :)

Can we go back to lifting shadows by five stops and arguing over banding?

With the 6D, the banding issues are basically gone. 5DIII shooters just use the wrong tool for the job and should get add a 6D to their kit.  ;)

7
Canon General / Re: seeimpossible.usa.canon.com?
« on: October 07, 2014, 10:30:45 AM »
With all respect, but this was the dumbest, silliest, least conceived action I have seen from Canon!
They see everybody complaining about missing DR, high MP or Mirrorless, they build up quite a lot of tension (look at this thread, 20 pages of speculations), everyone does expect a revolutionary product even more, but instead of bringing on a development announcement of the mythical 3D or the M3, what do they do?

With respect, anyone expecting a development announcement coming specifically from Canon USA was deluding themselves.

As for the complaining...people with issues should complain where it matters...  Hint: that's not here.  ::) 

Indeed, the way you complain is by not buying Canon products and that's why next April, I won't be spending money on Canon but on Sony. Hit them where it hurts: in the pocket. They won't listen to anything else.

While you're complaining, I'm sticking with Canon.  Which other system offers these options? —
8-15 fisheye zoom
17 tilt-shift
24 with IS
28 with IS
35 with IS
best 24-70/2.8
24-70/4 with IS and macro
23mm pancake
40mm pancake
50 1.2
85 1.2
200-400 with built-in 1.4X
flash with built-in radio
superb ergonomics
dual-pixel AF
12-14 fps
world's lightest DSLR

Sony A7R with Canon lens adapter.

8
Canon General / Re: seeimpossible.usa.canon.com?
« on: October 07, 2014, 03:53:44 AM »
< 10 mins - will the website crash with our optimism?

In which time zone are you?

I suppose the timer was meant for one of the USA time zones...

9
Canon General / Re: seeimpossible.usa.canon.com?
« on: October 07, 2014, 03:45:28 AM »
I've been taking screenshots of the page with the clock ticking down to use as a practical case of viral marketing to my students. Right at this minute I am not sure if it turned out to be the great example I thought it was!

They are just building up the hype a bit more - like a balloon just before it snaps.

10
Canon General / Re: seeimpossible.usa.canon.com?
« on: October 07, 2014, 03:30:35 AM »
"Times 0:00 "around the world beacuse if Timezones"

Says who?

11
Canon General / Re: seeimpossible.usa.canon.com?
« on: October 07, 2014, 03:25:08 AM »
Could it be that the page was just a test run and not really meant to be seen by us now? Maybe it's for a big announcement sometime in the near future (in 1-2 years).

12
Canon General / Re: seeimpossible.usa.canon.com?
« on: October 07, 2014, 03:11:11 AM »
Now we just need to wait for Japan to start working so they can flip the switch on the webserver... in 16 hours.

13
Would this sensor have the same noise that all of the FF owners are complaining about when they see the 7D2 samples?

Sure, and that would be the reason why Canon didn't upscale their crop sensors yet. Of course that's only at 100% magnification, and if you downsample and denoise to 20mp crop the ff sensor would still have a large edge - but color fidelity and postprocessing elasticity would still suffer.

I'd be more worried about diffraction as well. At f/11 it's already kicking in on the crop and f/16+ is barely usable at all.

True and this is a huge issue for macro, but aren't most people with ff sensors rather using smaller apertures than f11? The one problem I can imagine would be "infinite dof" landscape, but then there's focus stacking... how do d800/d810 owners deal with diffraction?

Diffraction is not as bad as it sounds. Since it's distributed evenly across the image it's easier to sharpen in postprocessing than a bad lens. There are a few examples around that show that with sharpening a f/16 image can look better than a f/8 image. Since diffraction has a soft onsetting i think that a sensor with a diffraction limit of f/5.6 can easily be used at f/11-f/16 without a high disadvantage after sharpening. And we're far away from diffraction limit at f/2.8 on full frame sensors. (Phone cameras are different though and they make good use of those tiny pixels they have.)

14
EOS Bodies - For Stills / Re: Long exposure questions on 5D MK3
« on: October 05, 2014, 09:48:10 AM »
To 3.:

The lens measures the movement of the lens and applies a counter-movement with a corrective optical element. This works well for medium-fast shake in the speed range of 1/10th-1/200th of a second. (Not sure if these are the actual frequencies where the IS works properly, it may be a bit more or less.) Ultra-slow and ultra-fast shake cannot be corrected by this method.

A problem is, that the measurement is error-prone especially in the slow-shake regime and it will move around the picture considerably in the order of seconds. (Just use 10x Zoom and push the Shutter button half-way to activate IS and see how the picture shifts around slowly.) Newer lenses switch off if they detect being mounted on a tripod - this may or may not work with your lens and tripod, so switch it off for long exposures.

You need a very sturdy tripod and a remote release and should use mirror lock-up to minimize camera shake.

15
EOS Bodies - For Stills / Re: Should i get the 7D MKII?
« on: October 02, 2014, 11:08:09 AM »
The 7D provides you with no improvement in image quality. Only focus and durability.

The 7DII provides you with only little improvement in image quality. Only focus and durability.

The 6D provides you with huge improvements in image quality. If you shoot night scenes the central focus point is good. You will need a better lens though but the quality improvement of full frame pays off.


Why would you need an advanced focusing system optimized for moving targets? The landscape or other static scenes are best focused in live view that all of these cameras provide.


I'd say get a good deal on the 6D and never look back. If you don't have many lenses, just start with the 24-105 f/4 IS kit-lens (good price) and add a fixed focal lens when you know what you need. In my experience the Tamron 24-70 f/2.8 VC provides you with a bit better image quality and a wider aperture (if you need that - shooting at f/8 most lenses do the job fine).

If you don't have it, add the 50mm f/1.8. It's good and wide and cheap.

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