All Forum Comments
Comment by Pentaxophile posted on K-50 anyone? at 09/06/2013 - 16:43
Comment by Pentaxophile posted on Looking to try something old at 09/06/2013 - 12:22
Comment by Pentaxophile posted on K-30 ta buy or not ta buy at 09/06/2013 - 11:01
Comment by Pentaxophile posted on MX-1...rather impressed so far at 08/06/2013 - 23:26
Comment by Pentaxophile posted on Yorkshire Sculpture Park at 08/06/2013 - 09:11
Here's me, taken on the 28/3.5 at f3.5. Great to use the 28mm as a wide angle again, rather than a normal:

Comment by Pentaxophile posted on Restoring the DOF and field of view of a fast fifty... without going FF at 07/06/2013 - 21:58
The adapter works like a teleconverter in reverse. The 135mm imaging circle is reduced to the APSC sensor area, effectively giving the same field of view - and DOF - as on full frame. By focusing the rays onto a smaller area, they also become brighter - giving you an extra stop of light!
This is the humble Pentax 50/1.7, stopped down one click.


The catch is, it doesn't work very well on wide angle lenses if you want the edges of the frame to be sharp. It has a lot of field curvature.
However if you want dreamy shallow DOF, without the nasty aberrations you get shooting wide open on an ultra-fast lens, it works. With the 50/1.7, it reminds me of using the Sigma 30/1.4. In fact the DOF is even shallower.
I have a set on Flickr here, with full size images for pixel peepers.
Comment by Pentaxophile posted on Restoring the DOF and field of view of a fast fifty... without going FF at 07/06/2013 - 21:57
Comment by Pentaxophile posted on Chloe, A Portrait @ 3yrs - Ricoh GR at 07/06/2013 - 20:22
Comment by Pentaxophile posted on K-50 anyone? at 07/06/2013 - 16:01
Comment by Pentaxophile posted on WTB: M 50mm/f1.4 at 07/06/2013 - 12:39

