December 21, 2014, 03:49:06 AM

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Messages - heptagon

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Reviews / Re: Bryan Carnathan has completed his review of the 7D Mark II
« on: November 24, 2014, 03:32:47 AM »
Looking at the noise comparison above ISO3200, the 7DII clearly is a little bit better than the 70D. - I suppose this is about as good as we get with Bayer pattern silicon sensors. It is not possible to make large gains.

Reduce read noise? At high ISO, the Canon sensors are already close to the limit.
Improve Quantum efficiency of the subpixel? Yes, but not with current silicon.
Use multicolor subpixels? This hasn't worked out well, so far, with silicon.

In that light, even the tiny gains, that Canon could achieve, are great.

Current sensors throw away a lot of light. Color filters block out a lot of light from the other colors. Green is the most important channel but only half the pixels detect green. That would be almost one stop improvement if every pixel was green.

I would expect 1-2 stops improvement when the sensor manufacturers move on to utilize new materials to build Layered sensors with multiple colors (possibly more than RGB) and 90% quantum efficiency throughout the spectral range.

Lenses / Re: Preorder: Canon EF 100-400mm f/4.5-5.6L IS II
« on: November 13, 2014, 12:14:40 PM »
Well, it seems to be a really really nice lens. But I won't preorder. I will wait for the first batch to get out so that the quality control fixes the early bugs. Then I'll wait some more because the price might come down a little bit. Then I'll wait even longer because I don't _really_ need this lens. Then I'd consider which camera to use with this lens. It should presumably be a crop camera. That camera would be the 7DII. Buying one without the other is pretty pointless in my case. This bumps up the price considerably. So I'll wait even more until the "fun" account bursts with money unless it gets drained by some other toy. But then, finally, I'll buy it and it will be nice.

Lenses / Re: First Image of the EF 100-400 f/4.5-5.6L IS II Lens
« on: November 07, 2014, 05:44:50 PM »
I'd be interested to see a comparison when these are out.

100-400L II at 400mm and f/5.6 upresed 50% compared to Tamron 150-600 at 600mm and f/6.3.
100-400L II + 1.4x TC III at 560mm and f/8 compared to Tamron 150-600 at 600mm and f/8.

My prediction as that both would be a near tie, except the Canon will have less CA and faster focusing on the first test.

my prediction is that the first comparison would put the tamron far ahead for total detail, 200mm is an insane amount to make up for, the tamron would have to pale even compared to a coke bottle for that to be true

now in the second case maybe it would be about a tie???? who knows or even better?

Results are mixed, see for yourself:

The Tamron loses a lot of quality from 500mm to 600mm.

EOS Bodies / Re: Canon 7Dii vs Nikon D750 Dynamic Range Test
« on: November 02, 2014, 12:48:30 PM »
Thanks for your post. A comparison with the 70D would be nice everything points towards that they have the same sensor.

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.

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.

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.

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.

Canon General / Re:
« 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.

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.  ;)

Canon General / Re:
« 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.

Canon General / Re:
« 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...

Canon General / Re:
« 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.

Canon General / Re:
« on: October 07, 2014, 03:30:35 AM »
"Times 0:00 "around the world beacuse if Timezones"

Says who?

Canon General / Re:
« 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).

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