December 20, 2014, 08:58:03 AM

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Messages - Lee Jay

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1
Lenses / Re: Quick Comparison: Canon's new 400mm Options
« on: December 19, 2014, 10:28:32 PM »
It's late, and I'm tired, so I don't entirely trust my results here.  However, if I'm right, this will explain these results.

The theoretical maximums, simply caused by diffraction, are 1555 lp/ph for f/5.6 and 2199 lp/ph for f/4.

So, the reason the 100-400L improved less is that there's less room to improve between the old one and the diffraction limit than there was for the old 400/4DO which has a higher diffraction limit due to its faster f-stop.

In fact, the result for the 100-400L II is just 1% less than what I'd calculate from a perfect f/5.6 lens behind an AA filter.  And that 1% number is based on a rule-of-thumb for the AA filter that itself is less accurate than 1%.

2
Lenses / Re: Quick Comparison: Canon's new 400mm Options
« on: December 19, 2014, 08:33:35 PM »
This one seems to focus more accurately and faster, have lower CA and flare, retain nearly full sharpness when the IS elements are not centered, have better handling, and have dramatically better IS.

Those are all solutions to the exact problems I had with the original (which I own at work).  The original has pretty good optical performance under ideal conditions.  This one is taken with the original with stacked 1.4x TCs on a Rebel T2i.



The new one will give people the ability to get slightly better resolution with lower CA and flare, and to get that performance far more often in the real world.  It also seems to take almost no hit at all from a 1.4x, which is pretty amazing.

I asked for it many times before, and now Canon has delivered the ultimate handheld reach system - the 7DII + 100-400L II + 1.4x TC III.

3
Lenses / Re: Quick Comparison: Canon's new 400mm Options
« on: December 19, 2014, 08:17:40 PM »
Check out photozone.de results! The new 100-400 II is killer! It actually handily beats the 70-300L and 70-200 2.8 IS II at 200mm!! And it's crazy good at 300mm too. And the 400mm is fine and big jump from the old version and, other than for edges, old slow prime!

For whatever reason, I find that photozone.de results have most often matched what I've personally seen.

As usual, PZ gets the numbers all wrong.

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=687&Camera=453&Sample=0&FLI=3&API=0&LensComp=972&CameraComp=453&SampleComp=0&FLIComp=2&APIComp=0

Here's an interesting one.  This is the 70-200/2.8L IS II + 2x TC III versus the new 100-400L IS II + 1.4x TC III both 1/3 of a stop down.  The 70-200+2x is sharper in the middle but softer on the edges.

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=687&Camera=453&Sample=0&FLI=5&API=3&LensComp=972&CameraComp=453&SampleComp=0&FLIComp=5&APIComp=3

4
Lenses / Re: Introducing the Canon EF 100-400 f/4.5-5.6L IS II
« on: December 19, 2014, 01:22:12 PM »

My 100-400 was very sharp.  I think a key criterion for the MkII will be performance with the 1.4xIII, given the availability of f/8 AF on multiple bodies including the 7DII.  The MkI didn't take a TC well.

Yeah, it did.  But the new one is quite a bit better, especially off-axis.

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=972&Camera=453&Sample=0&FLI=5&API=0&LensComp=113&CameraComp=453&SampleComp=0&FLIComp=8&APIComp=2

5
Lenses / Re: Introducing the Canon EF 100-400 f/4.5-5.6L IS II
« on: December 19, 2014, 09:24:09 AM »
I think apart from a rotating zoom (to which people seem to have mixed feelings) the usability with the TCs as confirmed by the MTFs, a reliable and more powerful IS, along with the much improved IQ is a sufficiently good reason for the widespread welcome this lens is getting.

Seems like the only thing missing is the much improved IQ.  Roger's initial, cursory tests over at the rental place indicate it's only around 4% sharper on average.  Of course there are other IQ considerations like flare, CA, distortion, contrast, color reproduction, etc., but 4% better sharpness isn't exactly a slam dunk.   ???

To be clear, I'm looking forward to getting this guy and I want to love the heck out of every aspect of it.  But 4% pales in comparison to the 40% improvement of the 400 DO II over its predecessor.

As I keep telling people, the old one was very good optically, but only under ideal conditions (IS off or stopped down a stop).  The new one seems to be massively better under regular high stress conditions (wide oopen with the IS in, and in resisting flare and CA.

6
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 18, 2014, 10:10:20 PM »

Yes tiny pixels = miserable ISO performance. 


Small sensors do, small pixels are helpful, not hurtful.

7
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 18, 2014, 09:44:38 PM »
remember folks..... we are talking about a FF camera with the same pixel size as the 7D2. It will have very similar IQ to the 7D2. It will have very similar ISO performance to the 7D2.

You can't have the megapixel count of tiny pixels and the performance of large pixels. You can have one or the other... or a compromise. You can't have both. The 6D, 5D3, and 1DX will be superior in low light.

That's why I think it will be a new series, not an update of an existing series.

You're off the rails.  Just making the sensor bigger - with the same sized pixels - will improve high ISO performance by 1 1/3 stops.

Oh, and in-general, smaller pixels perform better at all ISOs than larger ones.  The only exception is very extreme high-ISOs.
:)
I wonder how the sarcasm impaired will act?

Huh?

8
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 18, 2014, 09:24:18 PM »
remember folks..... we are talking about a FF camera with the same pixel size as the 7D2. It will have very similar IQ to the 7D2. It will have very similar ISO performance to the 7D2.

You can't have the megapixel count of tiny pixels and the performance of large pixels. You can have one or the other... or a compromise. You can't have both. The 6D, 5D3, and 1DX will be superior in low light.

That's why I think it will be a new series, not an update of an existing series.

You're off the rails.  Just making the sensor bigger - with the same sized pixels - will improve high ISO performance by 1 1/3 stops.

Oh, and in-general, smaller pixels perform better at all ISOs than larger ones.  The only exception is very extreme high-ISOs.

9
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 18, 2014, 09:57:05 AM »
Thank you very much for the links (especially the first two).

I have found the following interesting link:

http://www.canonwatch.com/eos-5d-mark-iii-hacked-anti-aliasing-filter-removed-more-sharpness/

Wow - what a horrid test.  They lighting is entirely different between the two shots.

10
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 18, 2014, 09:56:20 AM »
A question: Is it possible that the loss of sharpness by AA filter to be counteracted by the use of slightly increased sharpening? If that is so we can have the best of 2 worlds. Unless some very fine detail is lost completely at capture time...

You need a different type of sharpening to compensate for the roll off of the AA filter prior to the Nyquist limit.  But, yes, very little is actually lost that can't be recovered.  On the other hand, the aliasing from the lack of an AA filter cannot be removed in post processing.

11
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 18, 2014, 08:26:20 AM »
Some one earlier wrote:
No AA filter = not positive for anything but the company making the camera (AA filters are very expensive optical devices).  Removing it does not help image quality, and it does hurt image quality of still images.
[/quote]

Do you use cameras with and without the AA filters?  I shoot the D800, 5DIII, D800E, D810 and the D7100.  In ALL cases, for my most detailed landscape work at low ISO, the cameras without the AA filter produce superior IQ Images to ones that have the AA filter and I have the large prints (3 feet by 2 feet average size) to prove it.
[/quote]

I've seen tons of shots from AA-less cameras from owners who were showing them to me to prove their superior IQ.  The shots are always crunchy and covered top to bottom with artifacts.  Some people just don't see those artifacts while to others they are obvious and nasty.  Generally the first group is obsessed with sharpness.

I'm very sensitive to that crunchy artifact filled look, and absolute sharpness means very little to me.

12
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 17, 2014, 08:05:04 PM »
Enlighten us!  I'm always willing to learn something new, as long as it isn't arguing over word meanings.

His calculations assume there's no AA filter, no Bayer mask, and that the pixels are all infinitely small.  His limit calculator assumes (I think) MTF50 is a reasonable cutoff.  Most people would choose MTF9 or smaller.

13
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 17, 2014, 07:09:11 PM »
When does diffraction kick in on a 50mp 35mm sensor?! How would this be good for landscapes or studio shots where you stop down? Wouldn't scaling up a lower mp shot probably look the same?

http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm

Good read, thank you Mt. Spokane.  That's a level of nerdy I can cope with.

That site also has a nice intro to ND Grads section that I've used. 

- A

Just to warn you, some of the information on that page is misleading and/or wrong.

14
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 17, 2014, 05:58:54 PM »
the AA filter is pretty much obsolet unless you shoot fashion (lots of fine fabrics).

An f/2.8 lens is capable of proving diffraction-limited images to Bayer pixels that are less than 1 micron across.  The actual math works out that a diffraction-limited f/2.8 lens doesn't need an AA filter when your full-frame sensor is 1.5 gigapixels.

15
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 17, 2014, 04:16:03 PM »
In practical terms the a7r wipes the floor with any Canon sensor on the market today. This is from resolution and perceived point of view.

Well, it has more pixels so, duh?

Quote
My point was that if the a7R looks as good as it does next to my 6D resolution and sharpness-wise then it gets my money. I don't give a S___ about Nyquist–Shannon_sampling_theorem lol.

You should - it's the basis of the entire digital world.

Quote
Both the d810 and A7r and now the d750 have the AA blur removed, look clearer and sharper without moiree. That's where my money will go, Canon failing to match that benchmark.

And they're filled with jaggies, false detail, and false resolution.

A 50MP with an AA filter will wipe the floor with a 36MP with no AA filter, and that's the right way to do it - more pixels with proper sampling rather than fewer pixels with lousy sampling.

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