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Messages - dr croubie

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Lenses / Re: 70-200 F2.8L IS Mk1 or 70-300mm f/4-5.6L IS
« on: June 26, 2011, 10:05:38 PM »
...the new IS system is just plain silly how well it works...

i'll second that.
i just spent 18 hours in Singapore's Changi Airport between flights, between the orchid gardens and the butterfly house i filled an 8GB CF card and then some.
lighting wasn't that good, trying to keep ISO as low as possible, i was handholding the 70-300L at 300mm f/5.6 1/15s exposures with the IS on and getting a decent keeper-rate (and that's with the lack of sleep and coffee inbuilt). some i got sharp on a 1/5s to 1/10s, but not a good keeper rate...

EOS Bodies / Re: What do you want from the 5D mk III
« on: June 24, 2011, 03:01:05 AM »
Another question... everybody likes the damn video amateur capabillity of the 5d2 but nobody ask for a start/stop video record remote control (lanc in videocameras) having the 5d2 only the rear "set" trigger not very comfortable and even a really annoying way of capturing video. The actual cable releases (TC/RC 80n3  & such) only shot the shutter, then still images but no video! There start being developed some USB devices but not Canon made...

actually, i'm another person who's surprised that there isn't one.
set your camera up on a tripod, frame, focus, wait for the action, press the start button... ah damn, now the camera's shaking from pressing start...

EOS Bodies / Re: Camera lets you refocus after photo is taken
« on: June 23, 2011, 05:21:30 PM »
Just one doubt. Playing with the example, it seems that you are able to focus on a single spot, everywhere you want, but will it be possible to focus the whole range?

you can probably create a few different '2d' or 'traditional' photos from all the data, then layer them together as easily as you can take multiple-focus shots with a normal camera and layer them today.

surely the software would be easily enough manipulatable to 'fake' a narrow aperture or high DOF (without the diffraction) though...?

Lenses / Re: 70-200 F2.8L IS Mk1 or 70-300mm f/4-5.6L IS
« on: June 23, 2011, 05:14:15 PM »
Better - by two f/stops.  Basically, it all comes down to aperture.  An f/2.8 lens will deliver more OOF blur than an f/5.6 lens.  Yes, there are other factors that affect DoF, but they cancel each other out (e.g. a longer focal length gives you more DoF, but to get the same framing as the shorter lens you must be further away from the subject, and that gives you less DoF in exact proportion to the increasing focal length).

My EF 70-200mm f/2.8L IS II works very well as a portrait lens.

Well yeah, i know faster = more oof blur, i just meant i've never had any first-hand experience between the two.

it's just easier finding a good background sometimes. anyway, i've put a few more pics in the 70-300L lens gallery, shows a nice background even for the slowness...

Canon EF Zoom Lenses / Re: Canon EF 70-300 f/4-5.6L IS
« on: June 23, 2011, 05:03:36 PM »
woo, thanks for the bird tip. suppose one day i'll be back to get more shots of them, look out for more shots from me of aussie birds in a week or two...

anyway, another shot from that day, to show the bokeh. Taken in a forest with some hoverflies near a leaf in sunlight, the background was all darkness with a bit of sunlight poking through the leaves behind. (the good focussing on the fly was just luck, all the rest of the shots were oof or moving or both)
7D, ISO250, 1/320s, 300mm, f5.6 (wide open). camera jpeg, no processing, just shrunk to 1200*800, and a 100% crop...

and for the hell of it, a 100% crop of the next shot, from the far top left corner of the (APS-C) frame. not going to win any awards for composition, but just to give you an idea of how the bokeh goes ever so slightly non-circular near the corner, still, i like it...

Lenses / Re: 70-200 F2.8L IS Mk1 or 70-300mm f/4-5.6L IS
« on: June 23, 2011, 02:40:41 PM »
Sorry, I'm striking my other comments because I didn't realize this discussion was about the new 70-300L. I wondered why everybody was raving about the consumer 70-300 non L. It's just an okay lens. I've seen other photogs with the 70-300L and thought it produced really nice output. On par with other L lenses. I still think you'll miss those two stops, though. Wonder how much bigger the 70-300mm would be if made into a straight f4 throughout the range.

yeah, i owned the 70-300 nonL, took me 6 months to get sick of it (or 2 months to get sick of it, 6 months to convince my sis to buy it) then bought the 70-300L. it's just plain amazing IQ compared, i reckon the IS is better too. (i've got a few images uploaded in the image gallery if anyone's interested).

a 70-300L f4 (even 100-300 f4 to pair with the 24-105 f4?) would be amazing, but probably bigger than the 70-200 f2.8 IS ii and at least as expensive.

i've never had a fast lens bar the niftyfifty, a 90mm f2.8 and a 250mm f3.5 soviet Medium Format lenses (both kinda softish open), so i can't really comment on how much better an f/2.8 200 does for a nice blurry background compared to a bit slower though...

Lenses / Re: 70-200 F2.8L IS Mk1 or 70-300mm f/4-5.6L IS
« on: June 23, 2011, 11:11:14 AM »
70-300L owner and loving it...

besides the 'main use' comparison (ie, wide open at f/2.8 for faster shots in lower light vs the extra 100mm for extra reach), think about: (from here
70-300L is 1050g, 70-200 2.8v1 is 1470. (that's nearly 50% more weight)
70-200 comes new with a free tripod ring (does your 2nd hand one? it will add even more weight though, to 1670g)
70-300 is 15cm long (20cm zoomed in), 70-200 is 20cm long all the time (does it fit in your bag or will you need a new one?)
70-300 takes 67mm filters (cheaper), 70-200 takes 77mm (or do you already own one size?)
70-300 focusses closer, better MM (70-200 has better MM with 25mm tubes though).

and 70-200 f2.8 will focus on any body with 1.4x or 2x extenders (to 280mm f4 and 400mm f5.6), do you own either already? 70-300 won't fit either canon-brand extender without smashing glass. apparently some of the Kenkos fit, which i intend to buy one day, but then they lose waterproofing ability.

the 70-200 f2.8v1 plus 1.4x TCv2 (f4 and f5.6@280mm) looks a lot softer than the 70-300 (f5.6@300mm) here

i took a lot of time deciding between the 70-300L and the 70-200 f4 IS, the 300 won just the tiny bit better IQ, lots more contrast, and the extra cost (and hassle) of extenders (i really did want the extra reach). so convenience is also a factor if you are going to want more than 200mm, even occasionally...

Lenses / Re: 300mm f4.0L IS discontinued?
« on: June 22, 2011, 02:57:13 PM »
in stock
in stock

I really hope it's not discontinued. i nearly bought it instead of my 70-300L (which was €50 more than the €1300 300f4). The only comparable then is the 300 f2.8, well over 3x the price (€4500). or the 300 f2.8 ii, (€6500)

ouch, if that's discontinued, then the 400 f5.6 is the last Big White Prime under €4500.

does this mean canon have so much confidence in their zooms that they're getting rid of everything that comes close? the 70-300L is as good res as the 300f4 wide open, but the prime gets 1 stop more light.

maybe if there's a 100-400L replacement, or even when the 200-400 1.4x f4 comes out, maybe they'll kill off the 400 f5.6 too...

EOS Bodies / Re: BUY 5d MkII now or WAIT for 5d MkIII????
« on: June 22, 2011, 02:44:05 PM »
Does that explain why Canon has released a new Rebel/xxxD camera every year, like clockwork, for the past several years?  With the exception of the most recent release, each has featured a new sensor.  Each has received the latest advancements (e.g. wireless flash control in the T3i/600D).

maybe it's the shops i look at, but they seem to keep lots of old models in stock a lot longer. my local shop has the 500/550/600 all in stock, it even marks the 500 and 550 bodies as "popular", the 600 as "new".
(but it only has the 1100, not 1000, 60 not 50, and no 1ds3 anymore.)

anyway, releasing new models every year in the xxxD line makes much better marketing sense, noone's really going to upgrade with less than a 150-difference i reckon (ie, 400D or 450D-600D makes upgrade sense, 500d-600d makes less sense), so it really doesn't matter if they repeat the sensor or whatever in a few models.

and throwing the latest sensor into the xxxD lines doesn't cannibalise much from the higher lines, even from the xxD (except those who bought the 550d before the 60d came out, like my sister). i'd be guessing that people going the 60d want a bit better quality, and the 550/600d are generally beginners not wanting to invest too much (or those who don't have the cash for 60d anyway).
the manufacturing benefits of just throwing in the latest sensor are huge, one piece for a lot of products, with no extra r&d costs, the marketing benefits of a low-cost 18mp camera far outweigh the tiny loss they'll make from potential 60d-buyers...

EOS Bodies / Re: The Land of Crazy or.... ? [CR1]
« on: June 22, 2011, 02:27:01 PM »
Can't seem to buy a 5DII here in Holland right now. Big Media Markt store in The Hague didn't even have a place holder for the 5DII on their DSLR display when I was in there last Thursday... and been out of stock for a while now it seems.

tried 2 stops the other side of centraal on tram 2/6.
... ok, just checked their website, 5d2 ook op. is claiming 5-10 werkdagen, somehow i doubt it...

EOS Bodies / Re: The Land of Crazy or.... ? [CR1]
« on: June 22, 2011, 01:25:23 PM »
It's certainly the case that Canon do historically wait until the oppositition have shown their hand before producing their trump card.

case in point, D3s announced Oct 14. 1Dmk4 announced Oct 20.

But the D3X is only just over 2 1/2 years old, the 1Ds3 is pushing 4 years. Do we have to wait for the D4(x) before a new 1ds4?

and the 5D2 came out 2-3 months after the D700, do we have to wait until nikon replaces that (whatever number it is in their randomly-generated sequence) before we see a 5D3?

EOS Bodies / Re: BUY 5d MkII now or WAIT for 5d MkIII????
« on: June 22, 2011, 04:39:01 AM »
But, what do you mean by a "better long shot"? More reach for the 1.6x with 18 megapixels? That's understandable.

Basically, take any lens (although it makes more sense with a long/telephoto). put it on the 7D, take a shot.
put the same lens on a 5d2, take the same shot at the same iso/f/shutter.
crop the edges off the 5d2 shot so that they have the same framing.
increase the resolution of the 5d2 shot to the 18MP of the 7d shot, and compare.
the 7D has better IQ (i'm sure i've seen this tested, but can't find it right now).

note: *not* the same test as this one, that's testing a lens+body combination to get the exact same shot. my test above is a "you already own a lens, what body is better?" question...

EOS Bodies / Re: BUY 5d MkII now or WAIT for 5d MkIII????
« on: June 22, 2011, 03:01:47 AM »
Image quality + file size + DOF  + low-light performance (simply amazing) .  :)

Image quality + file size + DOF  + low-light performance + FF - 8fps - €700 - AF - 60fps video - pixel density (i think it's been proven a 7d takes a better long shot than the same lens on a 5d, cropped and up-ressed).

all depends on where your priorities lie. the extra €700 in that equation swung it for me, or i'd have gone a 5d2...

Anyone see a downside to this?

if the charger and battery circuitry are both designed properly, there should be absolutely no problem with leaving the battery constantly on the charger...

... but:
i wouldn't, a) because you can never fully protect against power surges. maybe the once every few year spike when it all goes wrong, it could easily arc over the internals of the charger and blow the battery (but then, you'd lose your pc, microwave, tv in that case too, if it happened).
b) charger constantly plugged in draws some power. constantly drawing some power produces some heat. some heat reduces lifetime of battery. maybe not by much, but it's nonzero. (and if any greenie comes past as says you should always remove everything from the wall socket to save carbon emissions, yes, that's true. or you could run your car for 2 seconds less each day, saves more carbon).
c) not relevant to you, but i've only got one battery. if it's not in the camera it's on the charger. if it's on the charger it's not on the camera. if it's not in the camera it's not taking photos. not taking photos makes me sad...

EOS Bodies / Re: Will Canon Withdraw from the Megapixel War?
« on: June 21, 2011, 03:07:32 PM »
So diffraction is a problem now? Is it an indication that lens design might be falling behind sensor design? Well, lens engineer go solve it... Is this a limitation with laws of Physics? Did they not say that microprocessor will face an inevitable limit with laws of Physics at xx nm and there is no way to go beyond? ... well, we are well into 20nm territory now and going strong....

Well Diffraction is a slight problem now, and will only become more so with more (especially denser) megapixels, that's a law of physics. Moore's "law" was never a law, it was an observation made in the '70s and just happens to have held reasonably well since. Limitations at whatever-nm process were just based on the current knowledge, and the engineers managed to overcome the problems with new discoveries.
Diffraction is different, there's no way to change the relationship between DLA and pixel size, no matter what lens/sensor designers do.

But whether it's enough of a problem is the other thing.
Canon's 120 MP APS-H sensor has a DLA of f/4.  Ouch.

So there's still a good margin of MP to go before we really hit the limits, good to know. And as said, it's just going to reduce where the sweet-spot lies.
Put X lens on a 7D, you get so many lppmm at wide open, you get more at f/5.6. Put the same lens on 1Dsmk6 and you get more lppmm at wide open, but you get *less* than that at f/5.6. Changing the shape of the MTF charts is not such a bad thing, as long as you know how to use it.
In the end, the line "the lens sharpens up as you stop down" will disappear, at a few hundred MP every lens will be sharpest wide-open and will reduce with aperture size.

What it will be the worst problem for is bad lenses. Take the Sigma 20mm f/1.8. its resolution starts low, and does get better with higher f-number, peaking at f/8 (or higher, f/8 is the end of the graph). Put that lens on a sensor with a DLA of something closer to f/4 or so and the MTF will peak at f/4 or even lower, the lens will be worse at f/8 than at f/4 for the same higher mp sensor.
So in a way it means lens designers will have to become better, they won't get the benefit of a 'sweet-spot' as mentioned.

But some other ideas I like. Like the 'split sensor in 3' to do some in-camera combining for HDR, one other idea I had is an automatic 'focus on 3 different lengths for 3 shots and combine'. OK, so people do it manually now, and it only works for static/landscapes, auto-incamera would be nice though...

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