October 24, 2014, 04:45:06 PM

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Messages - Lee Jay

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241
EOS Bodies / Re: Canon EOS 7D Mark II Specifications Confirmed
« on: September 11, 2014, 10:42:56 AM »
Beyond a certain point, miniscule differences in sensors aren't going to sell cameras. But, 10 fps, 65 autofocus points, GPS, weather resistance, intervalometers, etc. will.

More than tiny differences are available.  The A7S sensor has a 1/3 stop advantage in QE and around 1 1/2 stops in read noise at high ISO.  That's not "miniscule".

242
EOS Bodies / Re: Canon EOS 7D Mark II Specifications Confirmed
« on: September 11, 2014, 10:00:52 AM »
What's with the bulge in front of the hot shoe, btw ??

I am pretty sure it is the GPS antenna

If they can put a GPS antenna on the outside, why not a WiFi antenna?  The frequencies aren't far apart.

243
Lenses / Re: The New EF 24-105mm f/3.5-5.6 IS STM
« on: September 11, 2014, 09:53:02 AM »
I wouldn't be surprised if Canon plans to release the 5DmkIV with an FF sensor that has DPAF.

If the 6D is a full-frame 60D, then wouldn't it stand to reason that a 6D replacement would be a full-frame 70D?  Maybe this is for that camera.

244
EOS Bodies / Re: Canon EOS 7D Mark II Specifications Confirmed
« on: September 11, 2014, 09:42:13 AM »
I still want to know how it will sync time between cameras without WiFi.

245
EOS Bodies / Re: Canon EOS 7D Mark II Specifications Confirmed
« on: September 11, 2014, 08:28:48 AM »
There could be details here.  I'll give an example.

In the 70D, you can switch to 3x crop mode in video, but only through a menu and when you do you lose dual pixel autofocus.  If this camera can smoothly shift between 1x and 3x while shooting and retain dual pixel focus that would be a substantial upgrade to me versus the 70D.

246
Slow AF can be a sports or action photography killer. I've been shooting at 1200mm f/8 more often these days for birds...but that's effectively killed off my ability to do BIF...I simply cannot focus on birds in flight anymore...the lens just hunts and even if the bird is dead on the center point, it usually cannot lock. That is in stark contrast to f/4, where lock is almost guaranteed.

I shoot 200+mph R/C airplanes with an f/5.6 lens (with a 2x TC) all the time, and it will track them.

247
EOS Bodies / Re: New Sensor Tech in EOS 7D Mark II [CR2]
« on: September 10, 2014, 04:08:55 PM »
I'm interested in high-ISO DR because I fight with that all the time.  The A7S sensor beats the 1DX (the best Canon has) by 1 stop at 12,800, 1 1/2 stops at 25,600 and 2 stops at 51,200.

248
EOS Bodies / Re: New Sensor Tech in EOS 7D Mark II [CR2]
« on: September 09, 2014, 06:07:19 PM »
You know, the A7S sensor numbers on sensorgen (http://sensorgen.info/SonyA7S.html) are quite a revelation.  Huge QE (67%), huge well capacity and almost no read noise at high ISO.  The read noise at low ISO isn't as good, but still better than anything Canon makes.

As far as sensor technology goes, there's your aim point, Canon.

249
EOS Bodies / Re: New Sensor Tech in EOS 7D Mark II [CR2]
« on: September 09, 2014, 03:01:41 PM »
Quote
These specs are largely identical with the spec list posted by CR, with a few differences. The source told me that:
•The EOS 7D Mark II sports a 20.2 MP sensor but it is not the same sensor as featured on the EOS 70D
•The AF has 65 points but only 32 are cross-type. Center point is dual cross. f/8 on center point
•The EOS 7D Mark II has a “pro build quality” (whatever this means in detail)
•Price in EU will be €1800 (that could mean $1,990 in the US)

http://www.canonwatch.com/another-mention-20mp-sensor-eos-7d-mark-ii/

We should know soon.   

I'm not sure I buy the 32 cross-type out of 65 total AF point spec.  Given the possible logical layouts of a 65-pt sensor, it's far more likely that a subset of cross-type points would be an odd number, not an even number.

Even if you count the center "dual cross" separately?

That's not how AF point count specs are listed, at least by Canon.

Yeah, but this is a third-hand rumor, probably translated multiple times from the original ancient Greek!

250
EOS Bodies / Re: New Sensor Tech in EOS 7D Mark II [CR2]
« on: September 09, 2014, 02:24:06 PM »
Quote
These specs are largely identical with the spec list posted by CR, with a few differences. The source told me that:
•The EOS 7D Mark II sports a 20.2 MP sensor but it is not the same sensor as featured on the EOS 70D
•The AF has 65 points but only 32 are cross-type. Center point is dual cross. f/8 on center point
•The EOS 7D Mark II has a “pro build quality” (whatever this means in detail)
•Price in EU will be €1800 (that could mean $1,990 in the US)

http://www.canonwatch.com/another-mention-20mp-sensor-eos-7d-mark-ii/

We should know soon.   

I'm not sure I buy the 32 cross-type out of 65 total AF point spec.  Given the possible logical layouts of a 65-pt sensor, it's far more likely that a subset of cross-type points would be an odd number, not an even number.

Even if you count the center "dual cross" separately?

251


I'd like to know the actual resolution of a lens regardless of body.

Hearty Amen.

Why? Academia? Don't get me wrong, there is nothing wrong in and of itself that I can see, but seeing as how we pay thousands of dollars for these lenses that we can't use without bodies I question any results relevance.

Convolution.

Ask yourself this question.  Why, when DPReview tests a body, do they use a quality prime at an optimal aperture, mounted to a heavy studio tripod, with careful focus bracketing and remote release?

The answer is, so that the lens so dramatically out-resolves the body that the results you get are almost entirely limited by the body itself.

Why do you want that?  So that you can estimate how the body will perform with other lenses.

Same thing with lenses.  How does the lens perform by itself?  You want to know that so you can estimate how it will perform with any body.

If you don't do that, you're left testing every possible lens/body combination and retesting every lens every time a new body is released.

Convolution allows you to avoid that.

1/R^2 = 1/Rs^2 + 1/Rl^2, where R is system resolution, Rs is sensor resolution, and Rl is lens resolution.

If you know Rs and Rl independently, you can find R.

252
The 100-400 + 2 x 1.4TCs doesn't look any better than the SX50, which costs less than 2 TCs

I hope you were kidding.  Your SX50 shot is noisy, over-sharpened, full of halos and artifacts, and full of CA.  Make sure you click on my shot to see it at full size.

253
EOS Bodies / Re: Are you planning to purchase a 7D2
« on: September 08, 2014, 10:04:20 AM »
i wonder if for most it would not better to buy a 7D and spend the rest for glass.

To me, that's not even the question.  It's whether or not the body build, performance and features are worth it over the 70D, not the 7D.  I don't use my camera to drive railroad spikes, so the body build isn't worth it to me.  The 70D feels good and solid, and has a lot of nice features that I could makes use of on occasion, including WiFi, tilt-swivel LCD (useful for video and when my camera is on my telescope), and the touch screen.

The 7D replacement announcement and follow-on testing will most likely dictate whether I buy it, or a 70D to replace my aging 20D.

254
In my experience the 100-400 is a dog with a TC,

This is a 100% crop from a 100-400L with two 1.4x TCs stacked on a T2i (18MP).


255
Wow!  Really F6.3 being marketed as a sports lens?  Maybe on the planet Venus.  Rarely is F6.3 enough to stop sports action.

Sometimes we play sports during the day, here on Earth.  Daytime is often about 7 stops brighter than nighttime under the lights.  So, unless you have a sports lens that's about 7 stops faster than f/6.3 I guess you can't shoot night sports.

I shot all day today at f/6.3, and I was getting around 1/1000th at ISO 200.  That was in leas than perfect weather.  Guess what?  1/1000th is often enough but where it isn't my camera does produce usable images at higher ISOs.

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