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Messages - NormanBates

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406
Canon General / Re: So... Sony just dropped their Juggernaut!
« on: August 25, 2011, 03:50:30 AM »
canon's 50 Mbps codec is very lousy, it delivers worse images than many 24 Mbps codecs (the ones on actual videocameras), so my guess is that it will be a win for sony there

but that's not really the important part for video: is line skipping really gone?

dpreview has updated some info, in particular adding a 1080p60 sample from the A77 (direct download of the camera video file, I think) and a further explanation of what the swivel screen can do:
http://www.dpreview.com/previews/sonyslta77/page8.asp
not the best sample I could imagine, but quite useful
in particular, I don't see any aliasing/moire

407
Canon General / Re: A77 : Is it a true SLR? What's the mirror for?
« on: August 24, 2011, 12:47:22 PM »
So, if the A77 has a purely electronic viewfinder, what's the mirror there for?

Just for the AF system? And if so, why is it half-silvered and not fully-silvered?

Thanks,

Martin


I think it's just fot the AF system, and it has to be translucent because it doesn't get out of the way when taking pictures (or feeding an image to the live view LCD/EVF)

this means you lose 1/3 stop of light on the sensor; but it also means it's much more difficult for dust to get to your sensor (eventually, it will get there, and it will be more difficult to get rid of it, but that probably will take longer than the camera will stay with me; in the meantime, I'll be much less worried when changing lenses in a windy day in the countryside: the mirror is much easier to clean than the sensor)

edit: another nice thing about this translucent mirror tech: AF doesn't stop working while you're taking pictures, so this one shoots 12fps whith autofocus
as seen here: http://www.amazon.com/gp/mpd/permalink/mL6KZXE96MW1


now, about those "canon and nikon will bring out something similar soon" arguments...
what you're saying amounts to: "yes, those iphones and android thingys are great, but nokia surely is an amazing company, my last 4 phones were from them and they were great for their time; they surely will respond with similar specs" - or will they?
if at least canon and nikon showed us what they're working on, maybe, just maybe, I'd be tempted to wait for them; if they don't bring anything out, I just have to wait to see if this baby is just as good as it looks like

408
Canon General / Re: So... Sony just dropped their Juggernaut!
« on: August 24, 2011, 09:17:29 AM »
Exciting!
Really fascinating times are here already, thanks Sony... Can't wait for the market response, if only there will be some super wide angle lenses in reasonable sizes available for those.

I guess you're talking about the nex ones, and don't want to use an adapter
if not, the tokina 11-16 f/2.8 is made with a sony alpha mount!
http://www.bhphotovideo.com/c/product/687279-REG/Tokina_ATX116PRODXS_11_16mm_f_2_8_AT_X_116.html

409
Canon General / Re: So... Sony just dropped their Juggernaut!
« on: August 24, 2011, 06:09:28 AM »
one thing i don´t understand is people who always think about switching to a different brand when a new camera comes out.

i mean... you don´t have much from the canon system (bodys, lenses)?

no, I don't: I purposedly try to be as vendor-agnostic as I can

for example, this is my lens set: 18-55 kit lens, 35mm, 50mm, 90mm, 135mm, 180mm, 300mm
all those primes are leitz vintage lenses for the leica-R mount, and they will work on canon, nikon, sony alpha, sony nex, m43, you name it (except the 50mm which is M42 and doesn't work on nikon, and maybe sony alpha)

so I just have to sell a body with kit lens, battery grip, and two extra batteries, and burn $150 on a new set of lens mount adaptors

(you'll notice I'm lacking on the wide end of things; that's precisely because I didn't want to buy the tokina 11-16 and be stuck with a specific lens mount, so I'm delaying that purchase as much as I can, and it's looking like that strategy will pay off)

next: Nikon and Canon, bring out your best shots or be damned!!



edit: oh, and now that I'm at it...

there’s a bunch of very detailed previews at dpreview:
http://www.dpreview.com/previews/sonyslta77/
http://www.dpreview.com/previews/sonyslta65/
http://www.dpreview.com/previews/sonynex5n/

* the PAL versions don’t have 60p, 30p or 24p, just 50p and 25p
* the NTSC versions don’t have 25p or 30p, but 24p at 24 Mbps should look great
* the tilt screen seems more limited than the one in the canons (doesn't seem like it can be located on the left side of the camera?)

and also, this is a great EOSHD post on which lenses can work on an alpha mount; very useful:
http://www.eoshd.com/content/3661/do-your-lenses-adapt-to-the-sony-a77-a-mount

410
Lenses / Re: Lens for a big sun in the pictures
« on: August 21, 2011, 06:39:15 AM »
I think that picture by philHolland is absolutely awesome, precisely because you get to feel the distance thanks to the atmospheric optical phenomena

about those cheap 800mm mirror lenses: it's not just the bokeh that is problematic, they're just not sharp at all, you may get similar results cropping an image taken with a 300mm
http://techreport.com/forums/viewtopic.php?f=37&t=75031

411
Lenses / Re: Lens for a big sun in the pictures
« on: August 20, 2011, 10:00:02 AM »
You may find this information useful:

in full-frame camera shooting 3:2, the moon will occupy most of the height of a picture if you use a 2000mm lens
on APS-C, that translates into a 1250mm lens

so, on my APS-C camera, with my longest lens (300mm), the moon takes up around 1/4th to 1/5th of picture height

the sun is even smaller

oh, and by the way: not all mirror lenses are crap... but the good ones are really expensive
check this big boy!!:
http://cgi.ebay.es/Carl-Zeiss-Pentacon-Six-1-5-6-1000-mm-Prakticar-/230606968851?pt=DE_Foto_Camcorder_Objektive&hash=item35b13f1813
here you can get a sense of how shockingly big this lens is; those are medium format cameras and lenses (my 300mm is in the back row, second on the right; it is 25cm long, 10cm wide, and weights well over 2kg)
http://www.pentaconsix.com/1000mm.htm

412
EOS Bodies / Re: EOS Movie or Pro/Semi Vid Cam
« on: August 19, 2011, 09:43:17 AM »
the biggest problem with video from the 5DII is that the vision is just too flickery for broadcast video

I really don't know what you mean by that

if you're complaining about the strobing from the slow frame rate, this is where I was tought to love it:
http://www.macvideo.tv/camera-technology/interviews/index.cfm?articleId=3213230

if it is something canon-related (i.e. if you don't like 24p or 25p on canon DSLRs but like the GH2 at 24p too, not just at 50p) then I'm just puzzled: I've never noticed "flickering" from my 550D

still, although some of my footage has actually been broadcasted, I didn't get to see it (I was in a different country), so maybe I'm missing something due to the fact that I've always seen my footage on a PC screen (or similar: my living-room 52" TV lives connected to a PC)

413
Lenses / Re: wide angle lens
« on: August 19, 2011, 09:28:04 AM »
yes, the samyang 14mm f/2.8 has a lot more distortion than the canon 14mm f/2.8L, and it is some ugly distortion too
http://www.photozone.de/canon_eos_ff/541-canon14f28mk2ff?start=1
http://www.photozone.de/canon_eos_ff/532-samyang14f28eosff?start=1
but if price is an issue, that canon is a non-contender (plus: the samyang is waaaaay sharper)

in any case, that distortion is the reason I'm also considering the tokina 11-16: it works as a 16mm on full-frame, and at that focal length it is nearly distortion-free on APS-C:
http://www.photozone.de/canon-eos/533-samyang14f28eosapsc?start=1
http://www.photozone.de/canon-eos/666-tokina1116f28eos?start=1
no idea what will happen in the corners of the FF sensor (I've seen some pictures taken with it, but none of charts); and it is also more expensive than the samyang

plus:
* the tokina 11-16 works on a FF body, but you have to be careful because maybe it could hit/scratch the mirror
* some 11-16 love here:
http://photography-on-the.net/forum/showthread.php?t=857295&page=3

and I forgot: tokina also makes a 16-28 F/2.8 that is quite good too:
http://www.photozone.de/canon_eos_ff/595-tokina162828eosff?start=1
but it's more expensive, and shows some distortion on the wide end too


edit: oh, and BTW: I shoot video, so PT lens or similar software is not an option for me, but I LOVE the manual focus and iris rings on the samyang (actually I'd get the nikon version and a cheap adapter: you never know what the future holds)

414
EOS Bodies / Re: EOS Movie or Pro/Semi Vid Cam
« on: August 19, 2011, 04:40:05 AM »
I find the big sensor (as in "at least micro 4/3") an absolute must, so I wouldn't even consider those sonys you posted at the beginning

but for "sporting events, press conferences, interviews, places", maybe it doesn't matter so much; in fact, it may be even better: racking focus on a football match with a big sensor camera is not easy (then again, I have no idea but the dynamic range may be a lot smaller)

what I know is that, if your budget allows for it, those small-sensor sonys, the sony FS100 or the panasonic AF100, will all feel a hell of a lot more confortable than a DSLR: pro inputs, pro features, lots of easy-access buttons, better codec and much sharper image... and of course no moire/aliasing that may drive you nuts on a DSLR (specially if you want to shoot at 720p for the higher frame rate)

for my narrative filming hobby, I wouldn't even consider any of them (I get a sexy-enough image with my 550D, which was just a fraction of the price), but my needs are quite different

and that's where I wanted to come: you stated some very specific needs, ones that are quite different from those of most people around here; I see a sizeable headache and some tough decisions in your near future...

415
Lenses / Re: wide angle lens
« on: August 19, 2011, 04:21:34 AM »
no idea about your budget or how wide you want to go, but...

for myself, I'm considering:

* samyang 8mm f/3.5
* samyang 14mm f/2.8
* samyang 24mm f/1.4
* tokina 11-16 f/2.8 (works on full-frame at the 16mm end)
* canon 24mm f/2.8

416
Lenses / Re: Samyang 24 f/1.4 is coming
« on: August 17, 2011, 08:02:11 AM »
I've never actually used one, but from what I've read around the web I really like samyang lenses
(when they started coming out, I already had a nice set of vintage leitz primes; I'm lacking on the wide angle side of things, and I think I'll go samyang when the time comes to fill that gap)

for example, check out these tests: the samyang 85mm f/1.4 is much, much closer to the way more expensive canon 85mm f/1.2 or zeiss 85mm f/1.4 than to the canon 85mm f/1.8, specially in terms of bokeh, which is really important in a 85mm lens
http://www.photozone.de/canon_eos_ff/483-samyang_85_14_5d?start=1
http://www.photozone.de/canon_eos_ff/536-zeiss85f14eosff?start=1
http://www.photozone.de/canon_eos_ff/502-canon_85f12ff?start=1
http://www.photozone.de/canon_eos_ff/419-canon_85_18_5d?start=1

the samyang 8mm is the fisheye I want; for the 14mm I'm torn between the samyang and the tokina 11-16 (which can work as a 16mm on full-frame bodies); for 24mm I had my eyes on the canon 24mm f/2.8, but I'll have to consider this new samyang lens too

but first I have to wait and see what my next body will be...

(oh, and that's where another samyang advantage comes in: being fully manual, I can get a samyang lens for nikon mount and adapt it to canon, sony, m43, etc, whereas the tokina 11-16 or the canon 24mm would have to get sold if I switched to, say, nikon)

417
EOS Bodies / Re: Coming Tech & More [CR2]
« on: August 12, 2011, 12:09:51 PM »
About DR:
Here's what I'd do: add two new colors to the bayer pattern, white (clear) and black (nd), and move from the current RGGB to something like RGGBWWWKK with a 3x3 basic structure. This should deliver both clean shadows (thanks to W) and safe highlights (thanks to K)

About 720p:
It's a well documented fact that the 1080p video that Canon dslrs deliver comes from upsampling the image that results from the line skipping process, which is much closer to 720p than to 1080p (and that's definitely p, as in "not interlaced, otherwise I wouldn't even touch it")

418
EOS Bodies / Re: DSLR Video. Sony is about to kick Canon's you know what
« on: August 03, 2011, 02:53:35 PM »
my thoughts are just the opposite of what neuroanatomist seems to think: I will only listen to actions, promises and rumors won't do, and I'm a b1tch ready to jump in bed with any other manufacturer that gives me what I want at a reasonable price (that's why all my lenses are vintage, manual, with large focal flange distance, cheaply adaptable to nikon, canon, sony, m43, nearly anything)

the bits that are not addressed here are line skipping and color (general look)

if they can get very high ISO values without too much noise, they may be using proper subsampling (which smoothes noise out), which means much less aliasing/moire, and much better sharpness; this is the single biggest problem with my current canon 550D, and whoever solves it in a tight budget and without breaking anything else will get my money

the color thing is very important too: the general look (and lack of some features and frame rates) is what keeps me away from the GH2, even though it doesn't use line skipping; we won't know a thing about this until the camera is out and in the hands of very knowledgeable people

edit:
this seems to be more than just a rumor:
http://philipbloom.net/2011/08/03/sony-enters-the-video-dslr-revolution-finally-a-bit-late-but-not-too-late/

419
I totally checked the date: "it can't be april 1st, right?"

what a joke...

420
Lenses / Re: why????
« on: July 24, 2011, 11:39:53 AM »
given yields also fall exponentially with die size, my guess is a full-frame chip will always be about 3 times as expensive as an APS-C chip

I can't find the link, but i read very recently that a FF sensor actually costs 20x an APS-C sensor because of the yield and possibility of defects...


well, it depends on the yields

my guess was based on an assumtion of 90% yields on APS-C sensors, which would lead to a 71% yield on full-frame sensors

20x cost is what you get if yields are below 70% for APS-C, and thus below 10% for full-frame

initially that would sound too low to my ears, but maybe you're right: with such low yields, each full-frame chip would cost around $500 just for the chip (ten working chips out of a $5000 wafer), which would be outrageous for a PC processor (which is where my limited knowledge about yields and wafers comes from), but wouldn't be a huge problem on a $3K to $8K camera

and that would mean $30 per APS-C sensor (166 working chips out of a $5000 wafer), which sounds pretty reasonable, and tells me this format is not going away anytime soon

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