Originally posted by Alex00 I don't see any reason why you want to shoot below f8 for such a wide angle lens. That's the reason for having a wide lens, to get allot in focus.
I wonder why companies keep making all the f/2.8 ultra wide angle lenses....
If only f/8 is the usable aperture on a ultra wideangle lens then why do Pentax made it an f/4 lens? On a crop sensor with the DA 15mm you have an enormous DoF even at f/4.
Originally posted by Alex00 At night you can shoot f8 with with longer shutter speed. No reason to go below f8.
Yes, there is, I don't need to stop down to f/8 and loose shutter speed unless I really want to.
DA 15mm main advantage is it's size and weight for it's focal lenght. What is the point of having an ultra light and small lens if you gonna carry a tripod? I might be better/lighter off getting the DA 12-24mm for more flexibility and better corner sharpness.
Originally posted by Alex00 In some occasions i use f5.6 for things like portraiture to limit DOF and get maximum center sharpness. DA 15mm is capable of producing stunning portraits. You may have seen my other thread doing portraits with DA 15mm.
I wouldn't have thought that it's possible to do portraits ("stunning"?) with an ultra wideangle lens like the DA 15mm at f/5.6 and in the same time having a short DoF unless you get really close where you get face distortion. With all due respect after looking at the baby portrait with your DA 15mm (beautiful baby) the DA 15mm is not a lens suitable for portraits, not that you can't take portraits with it, it's just that you need a longer focal lenght to avoid face distortion.
Originally posted by Alex00 As for f4 i rarely use that. It's never recommended to use the first f stop of any lens anyway.
Acording Photozone DA 15mm is stunning in the center even at f/4, it's just that corners are not good enough until f/8.