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Messages - epsiloneri

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EOS Bodies / Re: Canon 5DmkIII
« on: October 26, 2010, 08:58:53 PM »
Imagine two people buy an acre of land, one of them builds a skyscraper on it, the other a garden shed, by the logic you're using you would view the two as exactly the same, simply because they each have an acre of land.
You don't know how large the pixel sites are, and as they grow larger they become closer to each other.

Imagine that the two sites have no fences, people from each site are free to pass into each others land, but it's further to go from the shed to the boundary.  Imagine a simple wire fence, everyone can see into the neighbouring plot and some are able to climb the fence into it.  Now imagine a huge concrete wall no one can see it, and no one can pass through.  This is isolation, and it's very important, because you can have small plots where little can pass through and cause noise.

Haha, flake... that was one of the most incomprehensible similes I've ever seen :-) And it had no cars in it. But I agree that larger pixels don't necessarily translate to higher S/N. What mostly matters is the number of photons captured. Whether you capture them on one or four pixels doesn't matter. The exception would be in the very low S/N domain, where the noise becomes read-out dominated. Also, since the well capacity scales closely to the area of a pixel (not volume!), the dynamic range does not change much with pixel size either (the well capacity will be smaller for smaller pixels, but that is exactly made up by there being more of those pixels for an equal area).

EOS Bodies / Re: Canon 5DmkIII
« on: October 26, 2010, 08:46:43 PM »
I currently own a 40D (and I do love it), but my (lucky) girlfriend owns a Nikon D3, and aside from it being a full 35mm sensor, I just think the images that are shot on that seem so much sharper, more in focus, something.

That is most likely due to the lenses she has, aside from the FF advantage. Lenses are usually more important than detectors in producing a sharp image. I also assume you compared images obtained from both cameras by the same photographer, because image quality problems can also be due to what's behind the camera (I'm not saying it is in your case).

EOS Bodies / Re: T2i Replacement?
« on: October 26, 2010, 07:36:32 PM »
But it came out way back in February, and I was wondering if a replacement of it is going to come out anytime soon, because I would rather wait for it.

Waaaay back in February? Not even 10 months old and already worried about its replacement? Ah, kids today...  ;)

It results from spherical aberration - more details HERE and HERE.  Focus shift is generally worse in lenses with intentionally undercorrected spherical aberration, like the 50mm f/1.2L where some sharpness is sacrificed to produce better bokeh.

Thanks, that is a good write-up (and I found some other interesting posts on the toothwalker site). I had no idea manufacturers were deliberately under correcting aberrations to improve the bokeh.

Lenses / Re: Is the EF-S 35mm f/1.8 coming?
« on: October 25, 2010, 07:53:31 AM »
I see your point about f/1.8 v f/1.4, but is 30mm not closer to standard than 35mm?  30x1.6=48, 35x1.6=56.

If you go by the definition that the focal length for a normal lens should equal the diagonal, then the APS-C would have a normal lens at 27.3 mm (and the FF at 43.3 mm; 50 mm was chosen as a "standard" out of manufacturing convenience in the early 20th century)). But yes, 50mm on FF is obviously more similar to 30mm @ APS-C, but anything 25-36mm can be considered normal on the APS-C... the practice is rather arbitrary.

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.

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).

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

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

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?

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!

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!

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.

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.

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.

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  ;)

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.

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