Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-18-2007, 08:33 AM   #1
Veteran Member




Join Date: Nov 2006
Location: Hong Kong
Posts: 1,934
DA* 16-50 Vs DA 16-45, A Shootout

RiceHigh's Pentax Blog: DA* 16-50 Vs DA 16-45, A Shootout

08-18-2007, 09:25 AM   #2
sft
Senior Member
sft's Avatar

Join Date: Feb 2007
Location: Toronto
Photos: Gallery
Posts: 173
You can say underexposed compared to DA16-45 - or you can also say better-exposed. I prefer the output from the DA* and the crops of the tree clearly show that the DA* is quite a bit sharper and does have slightly less CA/PF. In fact DA* at f/2.8 looks better than 16-45 at f/4 in the center and considering that 16-45 is already very sharp - that is impressive.
08-18-2007, 03:38 PM   #3
Veteran Member
jeffkrol's Avatar

Join Date: Sep 2006
Location: Wisconsin USA
Photos: Gallery
Posts: 8,435
Putting a face on it..

I downloaded the 2 images to do my usual exposure check and here are the numbers. Only approx due to many factors including watermarking:
Couple of thoughts. I didn't see the metering mode used but may have missed it since I only image picked.
The f2.8 is a tad darker but not by much if you go by the mean.
10 "points" is roughly 1/4 stop. The mean difference is 12 point... Big woop.
AT f4 the new lens is an order of magnitude sharper than the f4
For those that care 110 is what the mean should be but it is a bit unhealthy in digital due to highlight clipping. f4 is already approaching clipping.

08-18-2007, 08:20 PM   #4
Veteran Member




Join Date: Nov 2006
Location: Hong Kong
Posts: 1,934
Original Poster
So, what's the exact point and rationale to leave room at the "Right"?

And, why two different Pentax lenses on the same body would give different exposure? In terms of EV and actual result?

I don't think there would be a good answers to these straight questions unless we use "inaccuracy" and "inconsistency" to explain..

QuoteOriginally posted by jeffkrol Quote
I downloaded the 2 images to do my usual exposure check and here are the numbers. Only approx due to many factors including watermarking:
Couple of thoughts. I didn't see the metering mode used but may have missed it since I only image picked.
The f2.8 is a tad darker but not by much if you go by the mean.
10 "points" is roughly 1/4 stop. The mean difference is 12 point... Big woop.
AT f4 the new lens is an order of magnitude sharper than the f4
For those that care 110 is what the mean should be but it is a bit unhealthy in digital due to highlight clipping. f4 is already approaching clipping.



08-19-2007, 05:37 PM   #5
Pentaxian
Arpe's Avatar

Join Date: Sep 2006
Location: New Zealand
Photos: Gallery | Albums
Posts: 4,344
So I'm curious, and I don't know the answer to this question, I'm asking it because I want to know. Have you ever seen exactly the same metering from two totally different lenses?
08-19-2007, 05:54 PM   #6
Veteran Member
jeffkrol's Avatar

Join Date: Sep 2006
Location: Wisconsin USA
Photos: Gallery
Posts: 8,435
QuoteOriginally posted by RiceHigh Quote
So, what's the exact point and rationale to leave room at the "Right"?

And, why two different Pentax lenses on the same body would give different exposure? In terms of EV and actual result?

I don't think there would be a good answers to these straight questions unless we use "inaccuracy" and "inconsistency" to explain..
Yes and no. One question to start.
What metering mode were these shot in?
without this answer it is impossible to begin a discussion. As a side note I'm sure Pentax Matrix metering is more err.. primitive than say Nikon..

One must start at the beginning.
You can argue with me on how far off they are but I still hold at 1/4EV different. Again big woop. They look more extreme but the numbers show differently.
See what a MINOR contrast correction does...You could do about the same w/ a slight gamma shift.
One thing to notice is they are not "identical" compositions. There is a minor shift in framing.
BTW: technically there is no rationale to "expose to the right" without considering the individual image and what YOU want to do with it.


Adding the 2 images at f4....The 2.8 gets real sharp real fast..

Last edited by jeffkrol; 08-20-2007 at 05:32 PM.
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!
da, da*, da* 16-50 vs, k-mount, pentax lens, shootout, slr lens, vs, vs da
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
great DSLR shootout dom777 Video and Pentax HDSLRs 1 03-25-2010 02:26 PM
People Model Shootout alohadave Post Your Photos! 5 10-03-2009 01:41 PM
21mm mini shootout GeneV Pentax SLR Lens Discussion 6 08-08-2009 07:30 PM
Suggestion Lens shootout section Jimfear Site Suggestions and Help 11 04-23-2009 03:05 PM
DoF shootout: Helicon vs. PhotoAcute falconeye Digital Processing, Software, and Printing 0 03-17-2009 04:46 PM



All times are GMT -7. The time now is 09:52 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