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Topics - dilbert

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Third Party Manufacturers / What does Sigma do next?
« on: August 16, 2014, 04:14:10 AM »
In terms of optical performance, Sigma are smashing it out. The 35 and 50 Art lenses are amazing but their 24-105 zoom not so (or at least not much difference to Canon's.)

In doing a 14-24 and 24 lens, Sigma clearly see a golden opportunity to deliver new lenses into a market segment that is not very well served (wide and ultra wide angle).

If they can deliver a 24-70/f2, that will raise a few eyebrows but how heavy will it be, etc? And for a lens like that, AF problems will not be acceptable because that market is a lot about indoor shooting at weddings, etc, where if you don't nail it with the first shot then you haven't gotten the shot. So they'll need to be on top of their game for that one.

But that makes me wonder, what other parts of Canon's lens lineup is weak? Where would you go ir you were Sigma and looking to capture a waiting market?

85mm Art? Is there anyone with a Canon 85/1.2 or 85/1.8 that is unsatisfied with their lens?
100mm? Again, do you read about anyone bitching that their 100 is no good? Or 135? Or 200?

When it comes to zooms, it's a bit more interesting.

They have a 14-24/4.5-5.6 that will likely be replaced by the 14-24/4.
They have a 24-70/2.8 now but rumors are that a 24-70/2 will replace it.
The 150-500 is kind of in a league of its own.

But then there's a 24-70, 120-300, 120-400 and three 70-300s. None of which are particularly good (especially the 70-300s.) In that space, Canon has a 100-400 that is well north of $2000, a 70-300 consumer grade lens that isn't worth owning (even Tamron's is better) and a 70-300L somewhere between 1200 and 1500 (depending on rebates.)

Could Sigma do a 70-300 Art at or just under $1000?
Or maybe in the $700-$800 space that provides enough value for money over Tamron's lens?
What about a new version of the 120-400? With Canon due to replace that soon, waiting to see how Canon position that in terms or price vs optical performance is sensible.
I can't see them replacing the 120-300 unless they introduce another medium zoom that os X-120.

There's a hole in the market for a good performing telephoto zoom in the 70 (or 100) to 300 for full frame that delivers good optical performance across the frame and is sub-$1000 (although I suspect that it needs to be more a sub-$800 lens to lure away buyers from Canon's 70-300L.)

What else?
If you were Sigma, what part of Canon's (or Nikon's) lens lineup is weak and easily attacked?

So it would seem that Sony's hype around more DR from this new sensor has failed to deliver at DxO's testing labs.

... and I'm willing to trust DxO more than I am Sony.

Reviews / DxO reviews Sony A7s: king of low light photography?
« on: June 17, 2014, 05:51:25 PM »

DxO give it a low light score of 3702, which bests the 1DX (2786) and 6D (2340). Not unsurprising given the much lower MP of the sensor.

Is the A7s now the king of low light photography?

Landscape / Green Flash
« on: June 17, 2014, 10:40:40 AM »
Has anyone (else) here ever captured the green flash at sunset?

Lenses / When does the 16-35/f4L IS arrive?
« on: June 15, 2014, 12:20:38 AM »
Anyone have any suggested or predicted dates?

EOS Bodies / Can Canon deliver a FF sensor that is class leading?
« on: May 15, 2014, 11:02:45 AM »
Whilst we're going to have to wait a month to find out what the distortion is like on the 16-35/f4L, the MTF graphs and samples tend to suggest it is going to be a class leading lens. And how long have we had to wait for it?!

And if Canon can do that, can it finally deliver a FF sensor that is also class leading? By class leading, I'm referring to noise control and DR that is close to linear right through the ISO range and that matches or exceeds that of Sony sensors.

What's important about it being linear? At the moment Canon sensors have a DR function that is flat in the low ISO range as opposed to Sony's which is linear: below ISO 200 (or is it 400?) there is very little gain in DR from Canon sensors whereas Sony's deliver substantial gains the lower the ISO goes. I suspect that prior to Sony's sensors coming out, people thought that the "flat area" at the start of Canon's graphs looked good because there was no degradation. What people didn't realise is that there shouldn't be any flat spots, rather the DR (colour, noise, etc) response of the sensor should be close to having a linear relationship with ISO.

Reviews / reviews Sigma 50/f1.4 DG HSM Art
« on: April 20, 2014, 01:12:52 PM »
The latest 50mm is unusually large and expensive for its type; indeed its $950 / £850 price tag suggests Sigma is aiming at users who might otherwise choose the Nikon AF-S Nikkor 58mm F1.4G or Canon EF 50mm F1.2L USM. It bears a distinct family resemblance to the company's 35mm F1.4, but if anything is slightly larger, with a 100mm / 4" long barrel and 77mm filter thread. Its complex optical formula of 13 elements in 8 groups isn't based on a conventional double-Gauss design, like most 50mm primes are, but instead is of the retrofocal type.

... Camera used: Canon 5D Mark III

Software & Accessories / Google Camera App for Depth of Field
« on: April 20, 2014, 08:54:33 AM »
So it would seem that someone (Google!) has taken on the challenge of how do you make a camera phone with limited depth of field produce images that are like that with DSLRs:

Canon General / NAB 2014 and Canon
« on: April 08, 2014, 11:04:29 AM »
Have Canon made any announcements at the show this year?

Canon General / Warning Bells Sound
« on: February 27, 2014, 10:16:43 AM »
"Two US research companies have now published US retail sales numbers to their clients for January 2014. It does not look good for serious camera makers. Sales fell off significantly year-over-year, and steeply off from December. In fact, the steepest decline from Christmas sales I can remember."

EOS Bodies / Panasonic's view of the 7D successor
« on: February 12, 2014, 08:06:07 PM »

Sensor: APS-C, 20MP
ISO: 100-12800, 25600 (extended)
Shutter Life: 150,000
Silent shutter: Yes (slightly noisy)
AF system: PDAF, 19 area
AF detection range: -0.5 to 18 EV
Burst speed: 8fps
Recordable number: 15 (raw), 126 (jpeg)
Finger: OVF
Rear Monitor: 3.0" 1040K-dot LCD, static touch
WiFi/NFC: optional transmitter
Exterior Design: mag alloy body & splash/dust proof
Battery life: 850 images
Dimensions: 148.2 x 110.7 x 73.5
Weight (inc Battery): 910g

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