September 21, 2014, 06:34:31 AM

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Messages - raptor3x

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1
Increase minimum shutter speed for Av mode to at least 1/2000 like the 1DX.  Preferably just copy the 7D2's Auto ISO behavior.

2
Reviews / Re: Tony Northrup - D810 vs. 5D Mk3
« on: September 20, 2014, 09:50:09 AM »
Oh, and yes: it's unfortunate the A7 seems perform worse than the A7R at high ISO (~1/3 EV worse?). Not sure what happened there. Lower effective QE b/c of on-sensor PDAF? If this weren't the case, the A7 would probably be the better camera b/c it has on-sensor PDAF that helps it track (noticeably better than the A7S/R, which just hunt back and forth while trying to track, potentially leading to completely OOF images in AF-C), and EFC which means you can actually use it with telephoto lenses.

In terms of SNR I think the difference between the two is quite small, but something about the quality of the A7 noise doesn't respond well to LR's noise reduction and so in practice the difference is at least a full stop, if not more.

Also, any more detail on how you can get close to base ISO DR when using high ISO on the D810?

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Reviews / Re: Tony Northrup - D810 vs. 5D Mk3
« on: September 19, 2014, 11:59:29 PM »

I can't speak specifically to the A7. I haven't edited any of it's files. I guess I assumed the A7 had similar quality to the A7s, which doesn't seem to be that bad. I'm not surprised, though. The A7 was the first of the A7 line, and I think Sony rushed it a bit. Hopefully they will get better with successive models...and hopefully, they will stop compressing the raws with a lossy algorithm. :P

I think it has to be something like that.  I bought an A7R when it was first released and the high ISO was surprisingly good when downsampled.  I was really surprised at how bad the A7 is at high ISO when I got mine, I expected it to be even better but that's not the case at all. Either that or I've got a bum copy.

4
Reviews / Re: Tony Northrup - D810 vs. 5D Mk3
« on: September 19, 2014, 11:50:49 PM »
I also wouldn't say Canon "trounces" anything at high ISO. High ISO is primarily limited by physics. Canon has a marginal benefit at high ISO vs. cameras that are now becoming "last" generation, like the D800. The Nikon D810 closes the gap with the 5D III a bit more, and starts to encroach on 1D X territory at really high ISO (I actually think the D810 offers more DR at ultra high ISO than the 5D III...on a normalized basis, the D810 gets 7.7 stops of DR at ISO 51200 to the 5D III's 5.7 stops).

The A7 has quite a nasty quality to the noise at high ISO.  I've had both an A7 and A7R as well as the 5D3 and while from a SNR ratio aspect I'd suspect there's not a huge difference, the A7 has a very poor quality to the noise that doesn't clean up with NR very well at all.  In practice I'd put the 5D3 ~1 2/3 stops ahead of the A7 and the A7R ~1- 1 1/3 stops ahead.

The only thing out there right now that is really "trouncing" any other camera at high ISO is the A7s. It actually enjoys a two-stop advantage over the 1D X at ISO 51200, bringing nearly 9 stops (8.8 to be exact) of DR at that level. At lower ISO's it actually normalizes out a bit with the 1D X...the A7s' true advantage is at the ultra high ISO settings, and it does a remarkably good job.

The A7S is certainly a very intersting camera.  I was really hoping that the D750 was going to be a D810 with the A7S sensor inside.  If they had done that I probably would have picked one up along with a 70-200VRII.  As for the D810 at 51200, I'm not sure which numbers you're looking at but I see it about equal to the 5D3 and ~2/3rd stop behind the 6D in dynamic range for the normalized print size on DXO.

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Reviews / Re: Tony Northrup - D810 vs. 5D Mk3
« on: September 19, 2014, 10:26:18 PM »
If you're going to complain about apples to oranges, at least compare Canon's best against Nikon's best.  At pixel level, the D810 has a 1.9EV advantage over the 6D and a 2.2 stop advantage when both are downsampled to 8MP.  The 6D has a 1 stop advantage at ISOs over 800 at a pixel level and 2/3 stop advantage when downsampled to 8MP.

OK, that's fair.

The D810 still has higher DR at higher ISOs if you use your camera in a smarter way though, so those DxO higher ISO DR values are meaningless to me.

Can you explain this further?  I shoot an A7 as well as Canon and in my experience the Canon trounces the A7 at high ISO.

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Reviews / Re: Tony Northrup - D810 vs. 5D Mk3
« on: September 19, 2014, 09:37:30 PM »
If you're going to complain about apples to oranges, at least compare Canon's best against Nikon's best.  At pixel level, the D810 has a 1.9EV advantage over the 6D and a 2.2 stop advantage when both are downsampled to 8MP.  The 6D has a 1 stop advantage at ISOs over 800 at a pixel level and 2/3 stop advantage when downsampled to 8MP.

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Reviews / Re: Tony Northrup - D810 vs. 5D Mk3
« on: September 19, 2014, 09:15:55 PM »
I find this resistance to improved technology incredibly strange...to the point where I simply don't believe it.
But that's actually fairly normal behaviour, culture changes in generational steps. In many areas of society you literally have to wait for the "old guard" to die off before new ideas can be taken seriously.[/b]

Can I ask...in the context of this discussion, how does going from ~12 to ~14 stops of DR, or going from 22 to 36 MP, represent 'new ideas' requiring the 'old guard' to die off before they're adopted?  If you're talking about the switch from film to digital, or from vinyl to CDs, that's fine...but those are paradigm shifts in technology.  To suggest that the differences between current Canon and SoNikon sensors are a paradigm shift is ludicrous.  Rather, those differences are minor, incremental improvements.  Real improvements, yes...but minor.

You and I both know the difference is actually 3 stops: 11EV vs 14EV. Add FPN to the Canon and the practical DR is even less.

Why are you down-playing the difference? It actually approaches an order of magnitude, if not more.

Who knew that 12.1 actually rounds down to 11?  We learn something every day.

8
Lenses / Re: The Sigma 35mm Art is Toasting Canon's?
« on: September 18, 2014, 02:06:41 PM »
And each type of photographer is making the right decision....for them.

Except for Tokina with their new 70-200, a.k.a. the flare machine.

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EOS Bodies / Re: A New EOS Pro Body With 46mp Next Month? [CR1]
« on: September 18, 2014, 11:24:31 AM »
Why? 

What is Nikon's top of the line body?  Is it the D4s or is it the 810?
Hint... The D4s is $6500 and the D810 is under $3K.

Nikon's top of line camera, as well as Canon's often have lower MP than their next-in-line - hence 18MP for the 1Dx and 22 MP for the 5D MK III

the 1Ds MK III was 21MP and the 1D MK IV was 16 MP, so Canon has the history in the 1D body of having a more all around and then a Studio / high MP model.  The 1Dx was sort of a change.

So sorry, from what the rumor is and what placement makes sense, if this is a high MP studio body then this is competing against the D4s and it would be 1Dx vs D4 and 1Dxs vs D4s

Something tells me Nikon fanboys don't like that comparison.

If you think a high MP low frame rate studio/landscape body is competing against a low MP high frame rate sports body just because they're priced similarly then I'm not sure what to say to you.  Does that mean that the 7D2 is competing against the A7R because the price is similar? Or that the 17 TS-E is competing against the 70-200VRII?

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Lenses / Re: The Sigma 35mm Art is Toasting Canon's?
« on: September 18, 2014, 11:03:26 AM »
I have the Sigma 35A, and can't stop singing it's praises. Maybe i was extremely lucky, but my sample hasn't got any problems focusing, with any AF point, on my 6D. Or maybe i'm not as picky as the average CR forums user. :D
Anyway, i was so positively impressed by the 35A that i was almost certain i would have got the Sigma 50A as well, but i must admit that it's getting a lot more "bad focus" reports from the user, and this scared me. It could be that on a 35mm long lens the DoF is higher, thus the focusing imperfections may pass undetected, contrary to the less forgiving longer focal length of the 50A.

My copy had pretty severe focus shift based on focusing distance.  In the past I would have gotten rid of it but with the Sigma USB dock + MagicLantern's DotTune I was able to get the lens dialed in so that it's as consistent in focus as my 24-70ii. 

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EOS Bodies / Re: A New EOS Pro Body With 46mp Next Month? [CR1]
« on: September 18, 2014, 10:33:06 AM »
I could see this.  Canon has been rumored to have a high MP out in the wild and this would make sense to me to be a Pro body studio / landscape camera.  I don't consider this competition to the 810, but rather squashes the D4s... you know... that is supposed to be Nikon's "flagship" camera.

I think it's a bit silly to compare this theoretical high MP Canon body to the D4s, completely different animals.  It's real competitors would be the D810, A7R, and the 645Z.

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EOS Bodies / Re: A New EOS Pro Body With 46mp Next Month? [CR1]
« on: September 17, 2014, 08:36:25 PM »
Its interesting that Fred Miranda posted that he trusts the OP more than the Rumor sites.  The poster is a long time FM member.

Probably because he called that the 7D2 would use a 70D like sensor and all the major improvements would be in the AF and FPS while CR was talking about Foveon sensors.

13
Sony's superteles are white, too.  I think when you make your lenses white it means "we're really super serious about photos, guys.  Super. Serious."  I'm gonna guess $8k intro price. 

The whiteish colour is not just for good looks. It prevents the lens from thermic expansion (e.g. from prolonged sunlight exposure), which would lead to misaligments in the barrel (even a few microns can make or break it). At least, that's what the Canon has been proclaiming for years...

Reduces thermal expansion, it can't prevent it.

14
Lenses / Re: EF11-24mm F4L listed on a Japanese site
« on: September 16, 2014, 01:33:11 PM »
Looks like fake. Front element from 14-24 Nikkor and the rest from 17-40.
Canon will never put a red ring on a hood, it will be on a body, even with integrated hood.

Definitely not a 17-40L body, closer in style to the 8-15L but not the same.  As for Canon never putting a red ring on the hood.


15
EOS Bodies / Re: Official: Canon EOS 7D Mark II
« on: September 15, 2014, 02:21:00 PM »

I reset the camera, and tried that, and it still did not work. Then, I just hit the AF mode button (the one on the back, which you press first, before pressing M-Fn to actually switch modes), and moved the joystick. That worked. So, in most AF modes, you can just move the joystick, and the selected AF point moves. But in all points mode, you have to first hit mode, then use the joystick to move the AF point? Seems very tedious...

But, it does seem to work...mostly. It does initially lock onto the subject under my selected point...but it jumps a lot. As I track, it doesn't seem to really STICK to the originally selected subject...which is kind of annoying. I am not using my 600mm lens, though, so maybe it will work better on that.

What are your tracking sensitivity and AF point switch values?

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