|
Forum: Pentax K-3 Photo Contest
06-02-2014, 07:21 AM
|
| |
thanks so much Inexorable!
|
|
Forum: Pentax K-3 Photo Contest
06-01-2014, 02:43 PM
|
| |
Thanks Spooky!
I need to look up color field painting, good to have similar work to spur progress!
|
|
Forum: Pentax K-3 Photo Contest
05-31-2014, 10:54 PM
|
| |
Shooting a vast field of static multi-colored tulips, could not get past the feeling that all these bright stripes of color wanted more movement.
A short pan with a moderate shutter speed brought their exuberance back to life for me.
Low-res version of a RAW file.
Vivitar Series 1 28-90, on a Pentax K-5
|
|
Forum: Monthly Photo Contests
03-29-2012, 10:50 AM
|
| |
A recent spring day in Portland.
|
|
Forum: Pentax SLR Lens Discussion
01-10-2012, 02:09 PM
|
| |
Yes, I think that is the case.
There is a resistor in the circuit, perhaps it reads a value off of that to confirm auto aperture is available.
I think I will manually close the circuit with some foil, and see if the lens becomes more functional that way.
If I could just keep it in Auto as Aperture Priority, that would be a step up from where I am now.
db
|
|
Forum: Pentax SLR Lens Discussion
01-10-2012, 11:31 AM
|
| |
New member here, hope I'm posting this in the correct area!
I recently obtained a copy of a Vivitar Series 1 28-105, and it is the later Cosina
version with the 72mm filter.
I stripped it down, cleaned out a bunch of grit, repaired some stripped mounting screws, and reassembled.
Works okay, except that the "A" setting for auto aperture does not seem to work. Took it apart again, checked all the contacts and the actuating slider, all seems okay.
In aperture priority mode however, I cannot change the aperture setting. To verify it is not a camera problem, I checked with another lens which performed correctly.
The lens is stopping down fine in Manual mode, no restrictions on the aperture blades.
In program mode, it also appears to stop down correctly.
Exposed image EXIF data however, always shows exposure as either f/0, or f/2.8, even if it is stopping down fully.
EXIF shows it as an "A" series lens though, so at least it is getting that part right.
Carefully reviewing the auto aperture mechanism, it appears that there may be a part missing.
I'm guessing that it might be a little plastic shim or a metal lever or tab, that allows a molded stop on the aperture collar to depress the A contacts on the lens mount circuit board.
Does anyone have any experience, part lists, manuals, or even just a photo of this area on these Cosina Pentax mounts? I am assuming it was a detail used on many of their lenses.
If I knew what was supposed to be there, I can probably fabricate a replacement.
Thanks!
db
|
|
Forum: Welcomes and Introductions
01-10-2012, 11:13 AM
|
| |
Hi, new to the forums, but have been a long term user of the site.
Great info, and glad to be a part of it!
Thanks for all your hard work and expertise!
db
|
