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Messages - epsiloneri

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331
If he was that bothered about IQ why isn't he shooting medium format, or even large format film?

I think he is! Considering he tried to improve the FF IQ by mounting a medium format lens  ;D

Damien Hurst is a UK modern artist producing modern art on a commercial scale at very high prices, a lot of it is very controversial, such as a cow cut in half and preserved in formaldehyde.

Ah, yes, I've heard of that one.

Composition? no need to bother with that when you can crop it when you get back, in fact the only thing a photographer needs to do is to press the shutter at the right time and make sure it's in focus, the back office can do the rest!

Yes, "f/8 and be there". But it depends on the kind of photography you do, and there's far more to composition than just the framing.

Using the pop music analogy, it's like finding that a singer is miming on stage & using auto tune in the studio because they can't really sing, people still buy the albums and go to the live performances, and people believe that their idol is an 'awesome singer'

Well, yeah, although possible, I wouldn't think that happens too often, in either profession...

Focus shift is where the point of focus changes on stepping down the aperture.

Ok thanks, I didn't think of that. It's weird though, since the light obtained by stepping down (in the pupil plane) is a subset of the wide open light. That must mean that the foci for the different pupil radii aren't aligned, blurring the image at wide open aperture.


332
I was about to get a Nikon D7000, but have heard a lot of complaints about dead pixels in video shooting.

Can't you return it if it has bad pixels? Or try it when you before you commit? I agree that the swivel screen is a great feature on the 60D, but if most of your friends have Nikon, I'd still go for the D7000 (so you can trade lenses with them  :) ). Currently the D7000 also seems to be the better deal, feature wise (compared to 60D).


333
This guy at least tried a more controlled comparision betw. the 85 lenses.

Thanks, that was better, though I found the following puzzling:

Quote
It is a harder lens to use, since it is manual focus only and exhibits focus shift at close focusing distances that needs to be compensated for.

I though that focus shift was the difference between the AF determined focus and the real focus. How can there be a focus shift on a MF lens? He must mean something different, any idea what?


334
How can I say this?  Well partly because I know a professor involved in optics

Would you care to elaborate? I know an MD, that doesn't make me an authority on heart failures  ;)

BTW have you ever seen any of his work? If not, how can you call him a poor workman.
When someone demonstrably is talking nonsense I think it's quite easy!  After all he's the one who's saying that the equipment is letting his photography down and it's not as good as it could be.

I think it's fair to say that you can talk nonsense and still be an awesome photographer. And technically, your photography can always be improved. So there's no contradiction.

There are plenty of very good photographers around, a lot of making a success comes not from some kind of superior ability, but from luck, contacts, being in the right place, etc. etc.

Yes, but it's not sufficient, you have to have some minimum talent. But I don't think that talent necessarily is as intimately connected to the ability to evaluate the equipment as you seem to believe.

Just like many other professions.  I wonder how many people could say hand on heart that Damien Hurst, or Tracey Emin are the absolute best living artists, and that there is no one in the UK / World as good?

I don't have a clue about who you're talking, but I see your point ("not necessarily the best get famous and credit" etc). My point, however, is that you can be an artist without being able to evaluate the microphone in a satisfactory way. You can even complain how quality of the microphone is limiting your work, and still be an awesome artist!



335
EOS Bodies / Re: New \ I wouldnt buy a 5D2 now
« on: October 25, 2010, 04:16:12 AM »
I wouldnt buy a 5D Mark II now. Why? Because Murphy´s law. If I bought one in less than six months there would be a 5D mark III out at the same price and 5D2 price would fall.

If that's really the case, please buy the 5D mark II a.s.a.p., for the greater good!

336
Thanks for the link. The one thing I take away from that comparison is that you don't have to understand optics in all its details to be an awesome photographer. I guess in the same way as you can be an excellent driver without knowing the intricacies of how your car works. But we already knew that.

337
EOS Bodies / Re: *UPDATE* 1Ds Mark IV Feature
« on: October 20, 2010, 03:57:52 PM »
If you bin on chip you cut the readout noise out of the problem.

If readout noise is indeed significant, then yes, it would be advantageous. But is it? Usually readout noise becomes important for very low S/N in an image, i.e. underexposed parts such as deep shadows, and limits the dynamic range available. I wonder at what exposure level the readout noise becomes comparable to the photon noise.

338
Lenses / Re: Is the EF-S 35mm f/1.8 coming?
« on: October 20, 2010, 03:34:11 PM »
Therefore, I don't expect to see new EF-S primes coming out - they'll release consumer-level zooms for the Rebel owners, and EF (mostly L) lenses for the 'everyone else' group.

Sadly, I think you're right. I hope you're wrong, though.

339
EOS Bodies / Re: decisions decisions!
« on: October 19, 2010, 08:07:33 PM »
I had the same decision to make when my little girl destroyed my 400D.

And, the build quality is definitely better on the 7D compared to the 400D  ;)

340
EOS Bodies / Re: decisions decisions!
« on: October 19, 2010, 08:04:25 PM »
But, as i said - in terms of the 40d i was satisfied with most things bar its ISO performance in low light, i found even at 800/1600 noise was a problem shooting low light, night time exposures, indoors without flash and concerts etc. i do shoot a wide variety of things, but night time, and concerts are two of my favourite subjects, as is shooting with natural light in general which often requires good iso performance.

If you shoot low light, then I definitely recommend a FF camera - not necessarily Canon. 5D2 (and 50D) has a problem with pattern noise that limits its dynamic range, which can be limiting in some cases. 7D is much better in that respect, and the hope is that Canon will have fixed it also for the 5D3 (I don't know about the 60D).

The main reason for going FF is the lens advantage. You will find an excellent EF 85/1.8 for little money, but there is no competing equivalent EF-S 50/1.1 for APS-C (nor will there probably be). Same thing goes for the whole focal range.

341
EOS Bodies / Re: *UPDATE* 1Ds Mark IV Feature
« on: October 19, 2010, 07:47:11 PM »
Actually noise performance could be improved non-trivially in a binned environment.  Basically you are working with 4 times the number of data sources, so the random variance because 1/4 as strong.  I'm definitely not using the right terminology right now (you'll have to forgive me, it's been a *very* long day at the office), but I did want to respond with a general direction of what I'm thinking.  I'll respond later tonight or tomorrow in more detail if you would like, but long story made very short, you have 4x the signal to 1x the noise in a 4:1 (2x2) bin.  That is significant.

I understand that binning increases the signal/noise per pixel, but my point is that the binning doesn't need to be in camera. You can later bin the full resolution raw image in software with the same noise improvement. But perhaps you were referring to some other advantage?

(the S/N will improve 2x for 2x2 binning: the signal increases 4x but the noise only 2x because of the tendency of random noise to "cancel out" when you add it up - that's why adding up 4 noisy pixels only gives twice the noise as a single pixel)

342
Lenses / Re: Is the EF-S 35mm f/1.8 coming?
« on: October 19, 2010, 07:36:41 PM »
What is the point to make new EF-S lens??? Would be much better to renew EF 35mm f/2

The point is that EF lenses are wasteful for crop cameras. EF-S can be made much smaller and cheaper. Just think of the G12 with its 28-140/2.8-4.5 lens and think how big it would be if the lens had to be EF compatible. More extreme, but same thing.

Currently, the only EF-S prime is the EF-S 60/2.8 macro. I'm sure high-quality EF-S primes in a small form factor would find its audience. Most dSLRs are not FF anyway.

343
EOS Bodies / Re: *UPDATE* 1Ds Mark IV Feature
« on: October 19, 2010, 07:04:01 PM »
This gives them room to improve the 5D line and a *key* feature to differentiate the 1Ds. Pixel binning would be huge is potential advantage for low-light and/or extreme high quality work.

Why is that? The only advantage I see with in-camera binning is size of files/speed (which is nice, but I don't see the huge potential). One might also save some readout noise, but I doubt that's significant in most situations.

344
Lenses / Re: Sigma 85 f/1.4 EX DG Available Soon
« on: October 17, 2010, 05:33:12 AM »
Because all FF lenses perform better on crop bodies which take advantage of the sweet spot

That's true, but the FF optical performance of the sigma is not much in question. Its border resolution is as good or better than the Canon EF 50mm f/1.2 USM L (which itself is not very good in the border resolution department; see photozone.de, or the review by dpreview.com). The problem with the sigma is its AF. And I cannot see how AF issues would be less on a crop body.

For equivalent framing to use of the lens on FF, the depth of field on the crop body would be deeper.  So, f tihere are AF issues, they would be masked on a crop body by the deeper DoF.

Hehe, I think we've covered this topic before. Actually, AF issues get worse, if anything, with crop. I'm not going through the crop vs. FF lens/image equivalence thing again, but will merely give you an example that will make you immediately understand why. Imagine you have a focus error with a FF camera, such that the de-focused resolution is 1/160 of the image width (0.6%). Then the equivalent image in a crop camera, would be to crop that exact FF image with a factor 1.6x. The AF error would now be 1/100 (1%) of the image size - which is clearly worse. Resolution in terms of resolved minimum angle would of course be the same (the crop image is, after all, the central part of the same image as the FF).

345
Lenses / Re: Sigma 85 f/1.4 EX DG Available Soon
« on: October 16, 2010, 12:19:42 PM »
Reasonable in what way?  Fair? here's a quote:
These were not even close-distance shots that are typically most challenging for shallow DOF lenses.

For my copy, AF works better for close distance shots, strangely enough. The AF actually only misbehave on distance shots (> a few meters).

I think that this lens would be better suited to a crop frame camera, I have sold the Canon f1.4 50mm in the hope of a replacement which I think will be a vain one as Canon haven't released a  non L FF prime in too many years.

Why do would the Sigma 50mm/1.4 be better on a crop?


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