January 25, 2015, 09:18:22 AM

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Messages - Lee Jay

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1
EOS Bodies / Re: 50mp Cameras Coming in March [CR1]
« on: January 24, 2015, 11:24:27 PM »
But APS-C have more advantages than the spurious pixel density which has been illustrated time and time again to be largely meaningless in real world shooting of same generation sensors.

Other way around.  It's virtually always to be proven to be real and about what the math would lead one to expect.

2
EOS Bodies / Re: 50mp Cameras Coming in March [CR1]
« on: January 24, 2015, 11:03:17 PM »
I didn't miss your point, I ignored it. [/quote]

Even worse.

Quote
How do you shoot with a lens 1 1/3 stop faster on your crop camera if you are shooting on your ff camera with a 1.2, or a 1.4?

You can't.  That's the biggest reason I own a full-frame camera.  It's capable of shooting in areas outside the performance envelope of the crop camera.

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How about if you are shooting 2.8 zooms all around? What if you are going big with a 300/400 f2.8 on the ff, or a longer f4?

If you use a longer f/4 (say, 500/4), then a 300/2.8 on crop will pretty much do the same thing.

Quote
There are an awful lot of people here who did exactly what I laid out, owned a crop camera and then got a ff one and hardly touched the crop camera again afterwards, virtually every one of them will say they see the difference in their images, if you can't in yours then that is up to you.

I can - it's a stop, same as I can see the difference between f/4.5 and f/2.8.

3
EOS Bodies / Re: 50mp Cameras Coming in March [CR1]
« on: January 24, 2015, 10:38:38 PM »
The real competitor for this camera will not be other full frame cameras, but the Pentax 645Z

Not really. Anybody that has owned a crop camera then moved to a ff camera and then left the crop camera to gather dust knows the intrinsic difference that sensor size makes, well that happens again going to medium format digital, throw in the lack of AA filters on medium format and the differences become even bigger.

In the same way that crop  can't ever deliver what ff can (though I am not saying crop cameras are not very good and have several key advantages over ff cameras in specific situations), ff will never be able to deliver what medium format digital can. The point at what each sensor size becomes 'good enough' for each individual is an entirely personal call.

I use a crop camera and a full-frame camera side-by-side all the time.  I just usually use a lens on the crop camera that's one stop faster than the lens on the full-frame camera allowing me to use one stop lower ISO on the crop camera.  The resulting images are virtually indistinguishable from each other.

I don't care what your opinion of the differences are, or are not, as I very clearly said.

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The point at what each sensor size becomes 'good enough' for each individual is an entirely personal call.

You missed the point.  The differences are removed if the smaller sensor shoots at a lower ISO.

A full-frame sensor is like a faster lens.  The difference between 1.6-crop and full-frame is 1 1/3 stops.

4
EOS Bodies / Re: 50mp Cameras Coming in March [CR1]
« on: January 24, 2015, 10:29:10 PM »
The real competitor for this camera will not be other full frame cameras, but the Pentax 645Z

Not really. Anybody that has owned a crop camera then moved to a ff camera and then left the crop camera to gather dust knows the intrinsic difference that sensor size makes, well that happens again going to medium format digital, throw in the lack of AA filters on medium format and the differences become even bigger.

In the same way that crop  can't ever deliver what ff can (though I am not saying crop cameras are not very good and have several key advantages over ff cameras in specific situations), ff will never be able to deliver what medium format digital can. The point at what each sensor size becomes 'good enough' for each individual is an entirely personal call.

I use a crop camera and a full-frame camera side-by-side all the time.  I just usually use a lens on the crop camera that's one stop faster than the lens on the full-frame camera allowing me to use one stop lower ISO on the crop camera.  The resulting images are virtually indistinguishable from each other.

5
EOS Bodies / Re: 50mp Cameras Coming in March [CR1]
« on: January 24, 2015, 05:08:06 PM »
If it is the same as the quality of the 7D mark II then I will pass on it.

For my purposes I need clean pictures...

I don't believe pixel density is the reason the 5DIII produces cleaner images at a stop higher ISO than the 7DII. It's about the fact that the full frame sensor gathers so much more light.

You are correct.

In fact, the 7DII's sensor is better than the 5DIII sensor.  It's just under 1 stop behind, but the size difference should make it 1 1/3 stops behind.  Scale that sensor up and it will automatically be 1 1/3 stops better.

6
EOS Bodies / Re: 50mp Cameras Coming in March [CR1]
« on: January 24, 2015, 04:26:05 PM »
Thanks all for filter explanation. I understand the concept of an anti-aliasing filter now. Still a bit puzzled about the low pass filter. Several have said the low pass filter is an anti-aliasing filter - but if it passes low frequencies and not high ones, how does that help - and why doesn't it mess with the colour balance of the image?

AA filter = low pass filter.  In fact, they're often called OLPF (Optical Low Pass Filter).

The corner frequency is set somewhere near the nyquist frequency.  The idea is to filter out the spacial frequencies those the sensor can capture.

7
EOS Bodies / Re: 50mp Cameras Coming in March [CR1]
« on: January 24, 2015, 01:42:37 PM »
So by the sounds of things, don’t expect anything high megapixel related at CP+ in Japan next month.

So, what will be at CP+?

8
EOS Bodies / Re: 50mp Cameras Coming in March [CR1]
« on: January 24, 2015, 01:41:10 PM »
Will this be the first time Canon comes with two versions? I so doubt this….

Fourth time - 20D/20Da, 60D/60Da, 6D/6Dn are the first three.

9
I just hope they stopped using sqlite as the database manager for Lightroom.

That has prevented the use of a central network drive based lightroom catalog that you could be accessed from any machine in your local network.
Which has been a really big flaw if you have multiple people who are all trying to work on a large image bank.

NB: Coming out with a native Linux version would be a bonus, but not holding breath for that one.

Since SQLite is the basis of the entire LR catalog system, I wouldn't hold my breath on that one either.

10
EOS Bodies / Re: Global Shutter Coming to Canon DSLRs? [CR1]
« on: January 23, 2015, 08:25:50 PM »
CFast is based on Serial ATA which is not being developed past the current 6Gbit/s. Read for yourself at http://serialata.org http://www.compactflash.org

16Gbps SATA:
http://en.wikipedia.org/wiki/Serial_ATA#SATA_revision_3.2_.2816_Gbit.2Fs.2C_1969_MB.2Fs.29
http://en.wikipedia.org/wiki/SATA_Express

It's not 16Gbps SATA, it's 16Gbps SATA Express. Which is different. SATA Express is essentially SATA software stack on top of electrical PCI-Express. (So different connector, etc, etc) Would of course be great with a 16Gbit/s SATA Express host that can also take CFast 2.0 cards, but so far there is no evidence that is happening. I have no idea if that's even possible as there are limited number of connector pins one can fit inside a camera. (They make dual host connectors for PCs that can take both types.)

Should also mention that SATA Express is largely viewed as a transitional standard. So far it has rather few takers, and a lot of companies are looking to bypass SATA Express all together and jump to the next thing. So it doesn't appear at this point that SATA Express will gain the widespread adoption and support that SATA has.

So, IMHO CFast 2.0 appears to be the last iteration of that memory card standard. With whatever that means for widespread adoption, residual value and support. If that is not the case, and CFast 3.0 that is backwards compatible with CFast 2.0 cards is in the works, the players who support that should publish a future roadmap ASAP!

There is of course something to be said about what works here and now! Even if it isn't upgradeable in the same way we have become accustomed to with CF cards. :)

Yes, SATA Express is the follow-on to SATA, and XQD is the follow-on to CFAST.

http://en.wikipedia.org/wiki/XQD_card

Successors aren't always backward compatible.

12
EOS Bodies / Re: Global Shutter Coming to Canon DSLRs? [CR1]
« on: January 23, 2015, 01:08:48 PM »
I have the xt1 and regularly use the electronic shutter. I don't quite understand the science behind the differences between an electronic shutter and a global shutter. But I do know that they are not the same.

One is for both curtains (start and end of the exposure), electronic is for just one.

13
EOS Bodies / Re: Global Shutter Coming to Canon DSLRs? [CR1]
« on: January 23, 2015, 10:25:57 AM »
Obviously you're going to run into limitations, well before 1/1000.  I find (unscientifically), my flashes at full power seem to be somewhere around 1/200 - 1/300 range.  So there's limits of what you could do.  Many flashes might be down to 1/4 power by 1/1000...  but it's still better than HSS.

I did a moderately careful test of a 580EX.  It's flash power tails off, obviously, but most of the light is emitted in about 1/800th-1/1000th at 1:1.  That's why I think faster than 1/1000th has very limited usefulness, at least with that flash.

And I'm not knocking the difference between 1/250th or so and 1/1000th!  That's still two stops of ambient light quenching and motion freezing.  I'm just questioning the usefulness of going to 1/4000th or 1/8000th.  You're going to start quenching the flash power too, just in a different way than HSS does it.

14
EOS Bodies / Re: Purchase 5DIII now, or wait for 5DIV?
« on: January 23, 2015, 09:48:50 AM »
As for waiting, why?

There are two reasons for me:

The 5D3 has a pretty high level of fixed pattern noise at high ISO.  The 7DII seems to solve this.  I'd like to see them solve it on full-frame too since fixed-pattern noise is really hard to remove, and pretty distracting to me.

I want to use this camera for video as well as stills and the dual-pixel focusing system on the 70D and 7DII are pretty game-changing in that area.  Again, I'd like a full-frame version of the same technology.

Since Canon obviously has the technology to solve both "problems" (since both are solved on the 7DII) I'm looking forward to the 6D and 5DIII replacements before I purchase a new full-frame camera.

15
EOS Bodies / Re: Global Shutter Coming to Canon DSLRs? [CR1]
« on: January 22, 2015, 11:29:07 PM »
I'd like to hear why people want a very fast sync speed.  I know quite a lot about this topic and can see direct applications for sync speeds up to about 1/1000th, but at that point applications get a lot more limited.

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