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Anonymous
Not a troll, but can someone explain to me:

Does a crop factor effectively increase the focal length of a lens?

Would I get the same picture on a 1.6x crop factor camera with 50mm lens as I would on a full frame camera with an 80mm lens?

According to this illustration, it does, so why would anyone want to buy a full frame camera if you could just buy shorter focal length lenses (which are cheaper anyway)?
>> Anonymous
im posting just so I can see my post for the week this thread will be on the first page.
>> Anonymous
>>156005
>Does a crop factor effectively increase the focal length of a lens?
Yes.
>so why would anyone want to buy a full frame camera if you could just buy shorter focal length lenses
Because it's more of a "problem" when concerning the wide end, not telephoto. You're right, turning a 50mm lens into a 75/80mm lens is not generally a problem you can't compensate for. However, turning a 15mm lens into a 24/28mm lens is much more of a problem, because you're going backwards on a non-linear scale.
>> Anonymous
To make the question simpler, I rarely shoot under 35mm, what's a better camera to own - 40D or 5D?
>> Anonymous
your partially correct in that they do give you longer focal lengths, however your incorrect in assuming wide focals are cheap.

have you even looked around for ef-s/DX super wides(i.e 10-22/1x-2x)? though when it comes to shorter "long" lenses above 300 then yes, shorter is cheaper.
but you also need to consider things like DOF, perspective, pixel density, and final image quality as your having to blow up your image to match that of the FF image in terms of size, and also in pixels as until the 40D/300D most aps sensors were less than the smallest 12mp FF sensor so to match you needed to interpolate the image which reduces quality...
theres a lot more too it than just focal length multiplying......
>> I||ICIT !!mknjFN/v/49
>>156014
forgot tripfag...

>>156013
depends, if you can afford a 5d, get it.
if not 40D will do.
but again, theres more to it than just the crop factor.
5d is a superior low light camera, has better DOF control and is of course FF.

40D prob has better?/newer AF same MP, though smaller pixels... and maybe smaller with higher FPS.
comes down to what you actually need it for.
>> Anonymous
>>156021
>though smaller pixels
What the FUCK are you talking about
>> Anonymous
I've heard a lot of negative rants about the 5D, like how there's no weather sealing and it only does up to 3FPS, plus it's a three year old camera. The 40D is new on the market and seems to have much more advanced features.

I do mostly people stuff, though I've been wanting to dab into nature and architecture photography ... just don't know if it's worth dropping an extra $1000 on what essentially is better ISO performance and full frame.
>> Anonymous
>Does a crop factor effectively increase the focal length of a lens?

NO! You get the same image out of a 50mm lens regardless of the size of the sensor. A smaller sensor just automatically crops out part of the image. You DO get a similar image coverage. However, angle relations in the image are the same for same focal length, regardless of the sensor.
Now, it is debatable how much a difference this really makes, but from a physics perspective, looking at the light waves and how they travel through the lens, 50 mm is 50 mm, period. How you read it is a different issue.
>> I||ICIT !!mknjFN/v/49
>>156025
what the FUCK are YOU talking about.

its simple maths:

12 million pixels on a 35MM sensor compared to 12 million pixels on an aps sensor.
how is it physically possible they can be the same size. even with the 40D's 10MP theyll still be smaller than the 5D's pixels.

lrn2math before you make absurd accusations
>> Anonymous
>>156037
No, you're an idiot because those aren't pixels, they're sensor spots. Pixels only start to exist when your image is written to your memory card. Learn your fucking terminology before opening your mouth.
>> ac !!VPzQAxYPAMA
>>156035
>However, angle relations in the image are the same for same focal length, regardless of the sensor
The perspective (which is what I assume you mean when you're talking about angle relations) is dependent on the distance from lens to subject. So while a 50mm lens is a 50mm lens regardless of the sensor it's on, when you're using a crop sensor, you move backwards when using a 50mm lens, so it acts like a 50x1.6=80mm lens in terms of perspective.

>>156046
>those aren't pixels, they're sensor spots. [...] Learn your fucking terminology
The term is "photosite", not "sensor spot". Glass houses, stones, etc.

Also: There's pretty much a 1:1 correspondence between photosites and pixels, so demanding that they be called photosites (or, you know, "sensor spots", wherever you got that from) is needlessly pedantic.
>> Anonymous
>>156053
finally someone who knows what they're talking about

sage for dumb thread, though
>> Anonymous
>>156074
Age