thatisme
Mar 29, 07:24 AM
robbieduncan is right-on with his explanation, you're making incorrect claims: focal lengths are independent of the size of the sensor, a 50 mm lens will be a 50 mm lens on a medium format body, a full frame analog body or an APS-C-sized dslr. What changes is the field of view, which is an angle. It is this angle which is different on the above-mentioned cameras. The reason why people write something to the effect `a 50 mm lens on a crop body is equivalent to 75~80 mm lens on a full frame body' is that we've gotten used to associating focal lengths on 35 mm bodies to FOVs. Sort of like Americans got used to measuring distances in miles rather than kilometers.
which is why I have not made the claim that 200mm on one lens is not equal to 200mm on the other (by actual measurements). What I have claimed is that the EFFECTIVE (perceived) focal length is different, when angle is taken into effect (the size of the sensor in relation to the size of the rear element).
YOU WILL GET DIFFERENT IMAGES IF YOU USE A 200mm EF Lens on a 7D (APS-C) and a 200mm EF-S lens on that same camera due to the FOVCF. on the EF lens, the 200mm assumes you are using the ENTIRE image circle of the lens, which you are not. You ARE using the ENTIRE image circle on the EF-S lens, which is a True 200mm for that camera. You have to use the ENTIRE image circle to get a true measure of the focal length. when you use only a portion of that image circle, you have to apply the FOVCF to get the EFFECTIVE focal length.
Your last 2 sentences actually prove my point for me. Everything in today's photography arsenal (at least in DSLR) is based on the old film standard of 35mm image recording space (or sensor size). It is you standard of measure. It has not changed with Digital. This is why we have conversion factors and have to talk of EFFECTIVE focal lengths.
which is why I have not made the claim that 200mm on one lens is not equal to 200mm on the other (by actual measurements). What I have claimed is that the EFFECTIVE (perceived) focal length is different, when angle is taken into effect (the size of the sensor in relation to the size of the rear element).
YOU WILL GET DIFFERENT IMAGES IF YOU USE A 200mm EF Lens on a 7D (APS-C) and a 200mm EF-S lens on that same camera due to the FOVCF. on the EF lens, the 200mm assumes you are using the ENTIRE image circle of the lens, which you are not. You ARE using the ENTIRE image circle on the EF-S lens, which is a True 200mm for that camera. You have to use the ENTIRE image circle to get a true measure of the focal length. when you use only a portion of that image circle, you have to apply the FOVCF to get the EFFECTIVE focal length.
Your last 2 sentences actually prove my point for me. Everything in today's photography arsenal (at least in DSLR) is based on the old film standard of 35mm image recording space (or sensor size). It is you standard of measure. It has not changed with Digital. This is why we have conversion factors and have to talk of EFFECTIVE focal lengths.
flopticalcube
Apr 12, 12:59 PM
Affirmative action has it's pitfalls. You should ask such organizations why they feel the need to segregate themselves along racial lines. Let's hope the day comes when such institutions are discarded.
SevenInchScrew
Jun 17, 08:38 PM
The Slim design isn't going to trickle down to the other models?
If I were to guess, it would be this single new model alone for the rest of this year, with the 2 older models slotting in as the "bargain" versions for the holiday season. Then next year, after the launch of Kinect has settled in, and the older models are pretty well phased out, they could introduce a wider range of models.
If I were to guess, it would be this single new model alone for the rest of this year, with the 2 older models slotting in as the "bargain" versions for the holiday season. Then next year, after the launch of Kinect has settled in, and the older models are pretty well phased out, they could introduce a wider range of models.
Eraserhead
Mar 17, 04:51 PM
No, both should just be civil offences.
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room237
Apr 1, 09:16 AM
It would be one thing if the app allowed you view the channels over 3G or other WiFi networks, but you have to be IN YOUR HOUSE. This is ridiculous. I've been considering getting rid of cable altogether, this brings me a lot closer.
~Shard~
Oct 26, 12:52 PM
Interesting, I didn't hear anything about this in the rumor mill. I'm not sure how it will fare, but competition is always a good thing...
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Benjy91
Apr 19, 11:38 AM
Already got Expose multi-tasking on my iPhone :)
BlizzardBomb
Jun 1, 09:51 AM
Some comments.
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updo hairstyles for long hair.
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easy updo hairstyles for short
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short hair updo? i have
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Eraserhead
Mar 26, 01:36 PM
Actually given people are still driving with the oil price rises oil use isn't that elastic...
I'm sure the British government gets far more per capita from 'gas tax' than the US does, probably more overall too.
I'm sure the British government gets far more per capita from 'gas tax' than the US does, probably more overall too.
TheXFactor
Apr 7, 07:39 AM
Wirelessly posted (iPhone : Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_6 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8E200 Safari/6533.18.5)
No.
http://dl.dropbox.com/u/10644330/MR_Image_Hotlinks/MR_screenshots/MR_screenshots_04_2011/Screen%20shot%202011-04-07%20at%202.31.52%20PM.png
Seriously, who wants to wade thru over 500 posts to find out there isn't one? Not I. There should be a sticky. No iPhone app.
No.
http://dl.dropbox.com/u/10644330/MR_Image_Hotlinks/MR_screenshots/MR_screenshots_04_2011/Screen%20shot%202011-04-07%20at%202.31.52%20PM.png
Seriously, who wants to wade thru over 500 posts to find out there isn't one? Not I. There should be a sticky. No iPhone app.
more...
erictheb
Nov 12, 12:47 AM
Trying Japanese (Shift JIS) this time
�ǂ߂�́H
sorry about this, but I've had trouble with Japanese text only getting thru intact to a portion of friends to whom I write. Haven't been able to come up with a determination of what the issue is (e.g., Yahoo, 10.4.x, Hotmail). And it's late and I'm avoiding doing work.
Again, sorry for the massively off-topic stuff here...I thank you for your patience (if you actually are patient about it).
EB
�ǂ߂�́H
sorry about this, but I've had trouble with Japanese text only getting thru intact to a portion of friends to whom I write. Haven't been able to come up with a determination of what the issue is (e.g., Yahoo, 10.4.x, Hotmail). And it's late and I'm avoiding doing work.
Again, sorry for the massively off-topic stuff here...I thank you for your patience (if you actually are patient about it).
EB
DotComName
Mar 28, 10:30 AM
super excited, tho a little bummed that we won't see an ios preview in April... :/ hopefully iOS 5 will bring multimedia and file cloud sync to iOS.
GO :apple:
GO :apple:
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WestonHarvey1
Feb 24, 12:44 AM
It's like the extreme right wing has invaded this board. I'd expect at least one defense of government regulations here.
Origin
Sep 19, 05:05 PM
i think we found our problem, this is stupid
to install windows i had to unplug my 2 raid drives, i jsut inserted the cp disk withot installing bootcamp (can't install on raid) and after 10 secs the win xp install started
after that i replugged the raid drives and i can now switch boot disks as with bootcamp... strange huh?
but now this update... i mean, the ycan't expect a speeduser to just throw away his raid and reinstall to a single disk.
and if this is not possible( raid update) the yshould clearly start stating this in their installation instructions and notes, not the small print or some hard to find support site to hide the issue
Okay, finally I CONFIRM that the software raid used by Mac OS X is NOT compatible with the EFI upgrades :( ... too bad.
Why ? Because i just finished to install a fresh copy of Mac OS X on my 400 Gig "DATA" drive made the upgrade with this distribution ... and it worked like a charm !
So ...
to install windows i had to unplug my 2 raid drives, i jsut inserted the cp disk withot installing bootcamp (can't install on raid) and after 10 secs the win xp install started
after that i replugged the raid drives and i can now switch boot disks as with bootcamp... strange huh?
but now this update... i mean, the ycan't expect a speeduser to just throw away his raid and reinstall to a single disk.
and if this is not possible( raid update) the yshould clearly start stating this in their installation instructions and notes, not the small print or some hard to find support site to hide the issue
Okay, finally I CONFIRM that the software raid used by Mac OS X is NOT compatible with the EFI upgrades :( ... too bad.
Why ? Because i just finished to install a fresh copy of Mac OS X on my 400 Gig "DATA" drive made the upgrade with this distribution ... and it worked like a charm !
So ...
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Spaceboy88
Apr 5, 09:08 AM
Have fun using those on a 3.5" or 4" screen.
I'm not saying they WILL do that on iPod, but they'd be more likely to do it than a touch-screen home button.
I don't think the gestures would be that bad anyway. I've been using 10.7 Lion for a week now and some of those 4-finger gestures work perfect on the trackpad which is almost the size of an iPod anyway.
I'm not saying they WILL do that on iPod, but they'd be more likely to do it than a touch-screen home button.
I don't think the gestures would be that bad anyway. I've been using 10.7 Lion for a week now and some of those 4-finger gestures work perfect on the trackpad which is almost the size of an iPod anyway.
onemoof
Sep 14, 10:16 PM
Apple must have a 5 GHz chip lying around somewhere. I bet Motorola has produced at least one or two by luck in some of their production runs. Apple should slap them into a Mac and sell it for $100,000 just to say Macs are the fastest. Some rich people would love to have the fastest Mac around.
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Eye4Desyn
Mar 28, 09:00 AM
Now if they will only announce iMac release dates. Otherwise, this is welcome news.
donlphi
Apr 2, 02:37 PM
Hey dork! Where's the flood?!
My first thoughts exactly... :D
I suppose he can wear what he wants.
My first thoughts exactly... :D
I suppose he can wear what he wants.
VulchR
Mar 25, 06:59 PM
...And the "until you've been there" argument is BS too. Do I need to first be a paedophile before denouncing paedophilia?
....
Wow. Your logic here is inescapable. What is it you're denouncing exactly?
....
Wow. Your logic here is inescapable. What is it you're denouncing exactly?
Polo5
Oct 6, 10:00 AM
Really? that would be interesting
wordoflife
Mar 24, 02:43 PM
$299 is a steal.
wordoflife
Apr 19, 10:28 PM
Certainly seems to be an early build because the latest 4.x updates have different looking bars.
SMM
Nov 16, 09:48 PM
After reading the MS Tech-Net Flash, I get weekly, and how my company will have to license Vista/Office neither will be purchased. It is now my mission to have a ~90% Apple environment (1200 plus users) by 2010. I have already introduced Mini's in place of thin clients. They are a huge hit. If Apple stays on course, they CAN make big inroads into corporate markets they have not had before. Vista....who cares.
Abstract
Jan 8, 06:15 PM
I'm getting a really intrusive Head and Shoulders ad banner at the top of the page. Whenever your mouse pointer hovers above the banner, the banner expands, and a video automatically starts playing. This can happen quite easily when you go to click on another browser tab in Firefox/Safari/Chrome/etc.
Anyone else getting annoyed?
Anyone else getting annoyed?
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