Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-27-2012, 08:52 AM   #1
Loyal Site Supporter




Join Date: Oct 2010
Location: New York
Posts: 452
Max resolution from a lens

Hello All,
How can anyone determine at which aperture a lens will produce its maximum resolution?

02-27-2012, 08:58 AM   #2
Veteran Member
joe.penn's Avatar

Join Date: Mar 2011
Location: Maryland (Right Outside Washington DC)
Photos: Gallery | Albums
Posts: 2,902
View the charts here:

http://www.photozone.de/reviews
02-27-2012, 09:12 AM   #3
Pentaxian
bdery's Avatar

Join Date: Mar 2008
Location: Quebec city, Canada
Photos: Gallery
Posts: 5,695
Set your camera to program line - MTF, and look the aperture it selects in good light. There's your max resolution according to the people who designed the lens.

Only works with Pentax bodies, no other brands offers this that I know.
02-27-2012, 12:38 PM   #4
Veteran Member
stormtech's Avatar

Join Date: Jan 2011
Location: In the boonies (NW Penna)
Photos: Gallery | Albums
Posts: 5,670
QuoteOriginally posted by bdery Quote
Set your camera to program line - MTF, and look the aperture it selects in good light. There's your max resolution according to the people who designed the lens.

Only works with Pentax bodies, no other brands offers this that I know.
Yep - pretty neat feature which I like.

And to add - only works with Pentax lenses.

02-27-2012, 01:26 PM   #5
Pentaxian




Join Date: Nov 2011
Photos: Gallery | Albums
Posts: 3,657
QuoteOriginally posted by stormtech Quote
And to add - only works with Pentax lenses.
And to add: only works with new Pentax lenses!
02-27-2012, 02:17 PM   #6
Pentaxian




Join Date: Jul 2010
Location: Oregon
Photos: Albums
Posts: 1,417
Optimum aperture gives maximum IQ for an image in the optical plane. If you want high IQ across the frame when the field has considerble depth, a smaller aperture would probably yield better results. Expose, examine, decide.
02-27-2012, 07:05 PM   #7
Inactive Account




Join Date: Nov 2009
Location: Ninole, Hawaii
Photos: Gallery
Posts: 74
Great info. Never knew this tidbit about setting P and see what it comes up with. Tried on my new DFA 50 macro thru a range of iso settings. It tried to maintain f5.6 then upward.
My DFA 100 tried to maintain f4 from iso 80 thru 6400. New info daily.
02-27-2012, 08:05 PM   #8
Veteran Member
stormtech's Avatar

Join Date: Jan 2011
Location: In the boonies (NW Penna)
Photos: Gallery | Albums
Posts: 5,670
QuoteOriginally posted by john mood Quote
Great info. Never knew this tidbit about setting P and see what it comes up with. Tried on my new DFA 50 macro thru a range of iso settings. It tried to maintain f5.6 then upward.
My DFA 100 tried to maintain f4 from iso 80 thru 6400. New info daily.
Which option for the program line did you use when you tried this?

I've only tried the MTF so far, but am going to experiment with the other options also (landscape, portrait, etc) to see what values the camera chooses.

02-27-2012, 08:10 PM   #9
Site Supporter
Aristophanes's Avatar

Join Date: Jul 2008
Location: Dartmouth, Nova Scotia
Photos: Albums
Posts: 3,791
f/8 to f/11
02-27-2012, 08:11 PM   #10
Veteran Member
joe.penn's Avatar

Join Date: Mar 2011
Location: Maryland (Right Outside Washington DC)
Photos: Gallery | Albums
Posts: 2,902
QuoteOriginally posted by john mood Quote
My DFA 100 tried to maintain f4 from iso 80 thru 6400. New info daily.
5.6 should be sweet-spot on the DFA100, as shown here on the chart: Pentax SMC-D FA 100mm f/2.8 macro - Review / Test Report - Analysis
02-27-2012, 09:50 PM   #11
Veteran Member




Join Date: Dec 2006
Location: Gabriola Island
Posts: 585
QuoteOriginally posted by V'cuz Quote
Hello All,
How can anyone determine at which aperture a lens will produce its maximum resolution?
Use the lens and decide for yourself.
02-28-2012, 05:52 AM   #12
Pentaxian
bdery's Avatar

Join Date: Mar 2008
Location: Quebec city, Canada
Photos: Gallery
Posts: 5,695
QuoteOriginally posted by lytrytyr Quote
And to add: only works with new Pentax lenses!
It works with my F50 f1,7 and also with my Sigma 17-70.

QuoteOriginally posted by john mood Quote
Never knew this tidbit about setting P and see what it comes up with.
Just make sure you use the MTF program line. You also have other options for program line (another perk of Pentax) but they won't yield the same info.
02-28-2012, 06:18 AM   #13
Pentaxian




Join Date: Nov 2011
Photos: Gallery | Albums
Posts: 3,657
QuoteOriginally posted by bdery Quote
It works with my F50 f1,7 and also with my Sigma 17-70.
By "new," I mean with a chip.

Good to see that the Sigma is also recognized.
02-28-2012, 09:55 PM   #14
Inactive Account




Join Date: Nov 2009
Location: Ninole, Hawaii
Photos: Gallery
Posts: 74
It was set on "normal". I've never have use P and didn't even know there were options in the menu. As I've said before, you can own a Ferrari and be called Juan without ever competing at Le Mans.
Some day when I get tired of shooting Av, I might try something else, but when you're on the Mulsanne straight at 200 mph, leading the pack, why down shift?
02-29-2012, 05:55 AM   #15
Pentaxian
bdery's Avatar

Join Date: Mar 2008
Location: Quebec city, Canada
Photos: Gallery
Posts: 5,695
QuoteOriginally posted by john mood Quote
I've never have use P and didn't even know there were options in the menu.
QuoteOriginally posted by john mood Quote
Some day when I get tired of shooting Av, I might try something else
I always use my camera on P mode. why? Simply because P mode is ALSO Tv and Av. Just swivel the rear jog dial and you're in Av, use the front dial and you're in Tv. Press the green button and for everyday shooting, or when you want max resolution, or when you hand your camera to someone else, you're safe in P mode.

That's one of the features I like the best about my Pentax. I really only need P and M.
Reply

Bookmarks
  • 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!
k-mount, lens, pentax lens, resolution, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pixel pitch and lens resolution surfotog Pentax Medium Format 4 06-09-2011 12:01 PM
Lens resolution Tim_R Pentax SLR Lens Discussion 11 08-25-2010 02:44 PM
Theory/Engineering question on lens max aperture Michael Barker Photographic Technique 9 07-26-2010 07:45 PM
Visual Comparison: K7 max video resolution vs. 720 and 1080 future_retro Pentax DSLR Discussion 4 07-04-2010 09:47 AM
Lens Resolution and the K-7 kickboxingpenguin Pentax SLR Lens Discussion 5 04-16-2010 04:30 AM



All times are GMT -7. The time now is 07:51 PM. | See also: NikonForums.com, CanonForums.com 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?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top