Originally posted by cali92rs
You can't achieve shallow depth of field with a 23mm lens? Do you have proof of this or just regurgitating some misguided statements you have read on the internet?
Do a flickr seach of 23mm f1.4 and let me know how useless that lens is and how impossible it is to achieve shallow DOF with it.
On the examples given by LeeRunge, you have to shoot 1/4 of a head to get less shallow deph of field that you get comfortably from an FA77 or 50-135 on the same kind of shoots. I can see what my FA77 does wide open and it is not at all the same in practive.
Well except if you accept to be real near your subject that is. I understand that for the same framing you will get same dof, but that mean that if your are 2m away with a 77, you'll need to be 60cm away. That also mean the background will be less blurred because we speak only of dof not the amout of bokeh you' get.
For me, 23mm on APSC is not really for headshots where you'll have perspective distorsion and be too near to your subject. 23mm is more for scenes, and the interrest in this case is to have a scene that is wide, some mid range object in focus and everything in front and behind out of focus. That's excatly why so many complain of FF vs APSC shallow deph of field, because for wide angle, APSC is not shallow enough to be practical. If I was into that I would really think to buy an used FF and a 35mm f/1.4 and surely not a 23mm on APSC.
But I mean, everybody can do what he want. Me I tend to use more 50mm f/1.4 & FA77 f/1.8 for my shallow deph of fields needs.