Technical Aspects of Photography

Pick this off the net. An interesting read especially for those contemplating to get a FF camera.

http://www.kenrockwell.com/tech/full-frame-advantage.htm#

just curious,

a lens that nvr states DX , means its FX ??

is it DX lens on FX camera = DX format ?

and FX lens on DX camera = DX format ... right ?

if you use a FX on a DX cam... there will be a crop factor...

if you use a DX on a FX cam... there will be a wide factor... LOLOL.

but the figures are the same... depends on how you multiply or divide.

I am not sure about the Nikon system .. But for canon .. The lenses are divided into EF and EF-S types .. The S in EF-S meaning short focus ..

In Canon Systems .. Only the XXD Series and XXXD Series allows the use of the EF-S due to their smaller crop factors .. 5D and SLRs does not support the EF-S series .. I believe the XD series works along the same lines too by not being able to support EF-S lenses..

ETC with a 40D, the crop factor would be 1.6x .. So when u use say a 50mm lens .. What u are getting would in fact be 50 * 1.6 = 80mm .. But if u use it on a 5D .. It would still be 50MM ..

Canon tries to come up with some EF-S lenses like 10-22 which you will not on the EF mount .. This is due to after compensating for the crop factor .. The lens would be equivalent with the EF 16-35 ..

This is merely my understanding .. If i am wrong.. Could someone correct me .. Thanks .. And Nikonist .. Do tell us more about the Nikon lens systems .. I am sure some of us would like to know more about it =)

[why crop factor?]

ok. basically nikon and canon works the same.

canon has EF and EF-S
nikon has FX and DX.

for nikon film camera, if you use a DX lens. number one thing you see is that you will have the vignetting at the corners of the frames.

FX lens are lenses that can be used in DX format cameras and your FF cameras. (eg. D3, D700, and the nikon film) and when the lens does not specify DX means the lens is a FX lens. and FX lenses are more expensive.

look at this link http://www.clubsnap.com/forums/showthread.php?t=292045 watever lens under the DX category are DX lenses.

for FF cameras, you can use a DX format lens. but the moment you mount it(for eg a D3 12.1megapixel cam) the megapixels drop to 5 megapixels. to remove the vignetting that you will see at the corners. so.. you are wasting your money.

5D do not support EFS lens because EFS lenses are digital lens. but nikon allows the usage. but the compromise in your megapixels.

why crop factor?
crop factor, is like the first picture you see from don's link. a real 35mm film is that size. but digital format(sensor smaller see lesser things) only see the red box. so.. thats why there is like a "zoom" thats why we multiply the focal length by 1.5 or 1.6 depending on camera's specs.
to make it sound simpler. for example the film picture you see is shot in say 18mm but if you multiply 18 by 1.5 you get 27. so thus. there is a "zoom in" despite using the same lens/ focal length.

advantage or disadvantage?
pros and cons! haha! cause for tele shooters, by using a upcoming d90,d80,d300,d40x,d60,d40,d200(all have crop factor 1.5) using a lens of 200mm gives you 300mm. so the outcome is actually 300mm on a film or FF camera. you save the money!*ka~ching!*
i wouldn't talk about disadvantages cause kenrockwell has already touched on it.

MORAL OF THE STORY
if you are actually someone who will see yourself holding a FF camera 5 to 8 years down this long long road. get a FF lens. else. you can stick to EF-S or DX lenses. their cheaper. =)
why do i see myself holding a FF camera in the future? cause technology will get better. the sensors will get cheaper so the body will get cheaper. soon. entry levels will have FF sensors. =) just my opinons. feel free to voice out your displeasure or questions

if you use a FX on a DX cam... there will be a crop factor...

if you use a DX on a FX cam... there will be a wide factor... LOLOL.

but the figures are the same... depends on how you multiply or divide.

PARAM! no such thing call wide factor! haha..

AHAHAH! wide factor XD

i made that one myself!  hmm...

maybe i shall get into canon and come up with the wide factor.. HAHAAHAH.

just kidding XD

Thanks for the enlightenment poosiang .. Learnt a fair bit about nikon .. Interesting system that's really gaining popularity..

i know ppl carry FF for wide angles , and DX for telephoto ...

haha okies thanks poosiang !! 

Actually, there's more to meet to the eyes when it comes to EF and EF-S lens.Not sure abt Nikkors' since im not a Nikon users.

Well, even if you have a APS-C dSLR(proper terms for 1.5/6 crop sensor), having a EF-S lens does not means it's "confirm must have" for it. Due to marketing tactics, EF-S lens are inferior to EF lens, with the exception of the 17-55 IS USM which still suffered and crippled mildly anyway.

You notice:
EF-S lens have poor built quality. This is evident in kit lens
EF-S lens have plastic mount, compared to metal for EF. *some of them do have, i.e 17-55 IS
EF-S lens does not have, and probably will never have a L designation. Above i have wrote that the 17-55 suffers from marketing tactic - this is where it suffers. Even though it have glass elements comparable to L( 2 UD element), it does NOT have L status.
Prior to EF-S, any EF lens with at least one UD element or Fluorite have the L status.
In addition build quality is poor and it's an extend-extract zoom which is not typical of L.
 As most professional users of L own Full Frame dSLRs, Canon does not see fit to have a EF-S L too.

Just my 2 cents of knowledge.

poor but its good enough to function

anyways, you ment 17-85 or 17-55? o.o

cuz kit lenses are 18-55 and 17-85. o.o

One of the main reason EF-S will never have L status would be due to the fact they cannot be use in the xD Series and Film SLRs .. Unlike the L Lenses which would fit xD Series, xxD Series and xxxD Series .. Oh ya.. and not forgetting the xxxxD Series cams ..

yeaa.. i think canon is like.. trying to have a cheap yet good range of lenses for normal photographers.. making 'em able to take good pics still.

http://news.cnet.com/8301-17938_105-9834860-1.html?tag=mncol;title

heres a little sth i happen to see. haha! enjoy.

An interesting article which touch on the topic we mentioned about lens incompatibility .. haha .. Canon and Nikon really do have a big difference in their market strategy ..