Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-24-2010, 11:13 PM   #1
Site Supporter
Site Supporter

Join Date: May 2010
Location: melbourne
Posts: 937

Just getting back into screw mount again after a long absence. I've got a black Spotmatic 11 SMC 1.4, SMC 4.0 Macro, 300SMC F4, & just bought a 85/210 zoom.
Just wondering if anyone's got any focussing tips for me. I've no problem with the shorter lens, but using the longer lens, I seem to have a bit of a problem focussing with the "microprism" in the centre of the I seem to revert to the full finder...which is probably not correct.
Anyone else have this problem, & if so, how do you focus?
Cheers, Pickles.

05-24-2010, 11:31 PM   #2
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 50,444
There is nothing wrong with using the full finder. The microprism isn't as effective as a split screen would be, especially with a tele and when you're almost in focus. Your best bet IMO is just to shoot around F8 so that the DOF takes care of any minor inaccuracies.

Adam Webmaster (Site Usage Guide | Site Help | My Photography) server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

05-24-2010, 11:46 PM   #3
Veteran Member
lurchlarson's Avatar

Join Date: Nov 2008
Location: Oregon, USA
Photos: Albums
Posts: 681
QuoteOriginally posted by Adam Quote
... Your best bet IMO is just to shoot around F8 so that the DOF takes care of any minor inaccuracies.
Amen to that,

F8 and be there
F8 and forget it.

Also if your shutterspeed is too low that will sometimes get shake in the image which sometimes looks like bad focus.
05-25-2010, 11:15 AM   #4
Just1MoreDave's Avatar

Join Date: Feb 2007
Location: Aurora, CO
Photos: Gallery | Albums
Posts: 5,961
I got a KatzEye split-prism focusing screen a year after getting my first DSLR, and never found a reason to switch back. I recently got a new K-7, and have tried the stock screen for a while. It's OK, but I'm going to get another KatzEye screen. With the split-prism I'm faster, more accurate and have far less eye fatigue afterwards. With mostly manual focus lenses, I need it.

Drawbacks are cost - it would be cheaper if it was solid gold. The prism is in the center so you sometimes have to focus and recompose, and sometimes the viewfinder is cluttered. And spot metering becomes just finicky enough to be unreliable, at least a lot of trouble. Replacing the screen may also require some shimming for the best accuracy, and some fiddling depending on camera model.


  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, lens, pentax help, photography, smc
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
K7 Focussing HGMonaro Pentax DSLR Discussion 3 11-11-2009 03:56 PM
Focussing screens manishved Pentax Camera and Field Accessories 27 09-29-2009 06:43 AM
K100D AF not focussing gibikote Pentax DSLR Discussion 7 01-19-2009 04:07 AM
DA300 focussing? Two Jugs Pentax SLR Lens Discussion 2 01-18-2009 07:16 AM
faster focussing? keithlester Pentax DSLR Discussion 0 05-14-2007 07:55 AM

All times are GMT -7. The time now is 03:17 PM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]