The focal lengths stated on lenses are all based on 35mm film conversion aka full frame values. When you put a lens on a full frame body, what you see in the viewfinder will represent the correct view stated for on the lens, another words, you will see the actual 50mm view as according to proper mathematical calculations for focal length (wiki it for further info).

As for an APSC body which typically have a 1.5x crop factor, when you put a 50mm lens on it, what you see in the viewfinder will only LOOKS LIKE what you will see with a 75mm lens on a fullframe, due to the crop factor.

There's not much effect of the focal length numbers to what you are shooting, they are just a reference number to know roughly what angle you will get, and subsequently what effect you will achieve. You don't have to crack your head over the numbers, slowly you will get a grasp on the implications of the numbers, no rush on it

thanks bro.... calm sea water....
u dun need ND for this.... not much light at that time and easy to do long exposure....

dudes, wanna ask if any1 here has a Sigma 50mmF1.4...planning to get 1 but my 1st choice would be SAL50F14 if d image quality is comparable...been reading lots of reviews bout Sigma outperforms SAL... But I did tried playing with d Siggy on my fren's cam (Nikon D7000) and it's sharpness is wayyyyyy impressive, even wide open it's still pin sharp. But I wonder if it's good for portrait...

The Nature "S" in Maraetai Beach by cjlai76, on Flickr

I've seen background defocus on the NEX before , doesnt it only change the aperture for you automatically? its not really useful at night though. haha.. I might be wrong.

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Added on April 25, 2011, 10:31 amI've read a few reviews about the sigma 50mm F1.4 .. yes it is very good for crop sensor bodies.. HSM motor and very smooth bokeh rendition . Downside is the weight and the size of the filter which is 77mm. Full frame bodies it doesn't work as expected. But technically I never really tried one before , though sigma has its QC issues.

Yes , 50mm F1.4 is always good for potrait with that price. Unless you have the budget to go for CZ85mm F1.4

This post has been edited by Soony: Apr 25 2011, 10:31 AM

cjlai: very nice!! like 2 beaches top n bottom. XP

yeah this is also 1 of my concern, d QC issue...but I heard Sigma's QC has been improved over d years n isn't bad nowadays. But pin sharp at F1.4 is still a very attractive point...but does it worth the extra $$ it's everybody's guess. Thanks a lot for d infor dude!

Wow, such freaky clouds! Is the scene like that to the eye or just the camera? By the way, it's a cool shot!

to the eyes mostly.... for camera they dun hv such dynamic range to c both sky and ground.... so i need to push it up abit to bring out the color on the ground

cjlai: can share ur settings for those night shots?

Awesome!

bro, u can get the settings from the exif in flickr.... btw, which pic are u referring to?

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Added on April 25, 2011, 1:02 pmthanks bro

This post has been edited by cjlai: Apr 25 2011, 01:02 PM

the docklands Melbourne one. with the bridge and its reflection.

Docklands
Camera Sony DSLR-A700
Exposure 3.2
Aperture f/8.0
Focal Length 10 mm
ISO Speed 100
Exposure Bias 0 EV
Flash Off, Did not fire

Bolte Bridge
Camera Sony DSLR-A700
Exposure 15
Aperture f/16.0
Focal Length 20 mm
ISO Speed 100
Exposure Bias +0.7 EV
Flash Off, Did not fire

both not using any ND filter

This post has been edited by cjlai: Apr 25 2011, 02:31 PM

cjlai: thanks bro.

today USD is rm1 = 2.99$. good time to shop lolz

Tarak A77 on the market yet... Show me the link to pre-order it please

Anyone Planning to sell their sOny DT 50mm f1.8?? I wan!!

All sifu,

between 70-400G vs 500m F8 reflex mirror lens,
which one is more suit for birding interm of IQ and focus speed?
Pls advise.. Thx.

Sentul Park
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