All Forum Comments
Comment by pschlute posted on Advise needed. SMC Pentax 17mm fisheye f4.0 at 28/05/2008 - 11:27
Quote:
I'm glad that this is a deliberate feature rather than a bug. Not so glad it doesn't always work properly.
That is very interesting....can you provide a source as I would like to read up on that.amoringello wrote:
Of course, no matter your selected aperture, the lens should always be wide open until you actually take the photo. So focus should not differ with your AV mode set at f/2.8 or f/11, etc... (unless you're moving an aperture ring on an older lens).
What I have learned today is that focus should, and sometimes does, differ to compensate for spherical abberation - which varies with aperture. Since the lens isn't actually stopped down until the shutter is fired, the camera has to calculate what focus will be required in advance.Of course, no matter your selected aperture, the lens should always be wide open until you actually take the photo. So focus should not differ with your AV mode set at f/2.8 or f/11, etc... (unless you're moving an aperture ring on an older lens).
I'm glad that this is a deliberate feature rather than a bug. Not so glad it doesn't always work properly.
Comment by pschlute posted on Does your K10D's auto-focusing ever do this? at 28/05/2008 - 10:43
I think it works very well.
Comment by pschlute posted on Buttercup Bokeh at 21/05/2008 - 10:30
great capture..........hop..hop
Comment by pschlute posted on In the Pond at 12/05/2008 - 10:46
Great shots.....so sharp.
Comment by pschlute posted on Morning Macro Madness at 07/05/2008 - 12:38
Excellent... is it autofocus ??
Comment by pschlute posted on lucky find at 06/05/2008 - 10:21
Some really great images there.... well done
if you will accept a criticism from me..............
..... i think the signature detracts from the images.
if you will accept a criticism from me..............
..... i think the signature detracts from the images.
Comment by pschlute posted on Latest Images from Wales Visit at 06/05/2008 - 10:27
I finally had time to get out with my new DA* 300mm , and captured these on the Wey Navigation Canal near New Haw in Surrey.
Comment by pschlute posted on Tales from the riverbank at 05/05/2008 - 19:47
Nice shots Dan, and the pheasant is just outstanding...I am lost for words.
I got my DA* 300mm a couple of weeks back and only today managed to get out with it. Great fun.
I got my DA* 300mm a couple of weeks back and only today managed to get out with it. Great fun.
Comment by pschlute posted on First results Pentax SMC DA*300MM F/4 at 05/05/2008 - 19:53
if you are looking for wild fisheye effects however you wont get it with this lens... it is the 35mm equivalent of a 25mm focal length and although you do get curved edges you dont get the real fisheye effect of say the DA 10-17 at 10mm
As I said I have not had a chance to give it a good run on the K10 yet, but would anticipate that flare could be a problem in bright sunshine.