Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-16-2014, 10:32 AM - 2 Likes   #1
Inactive Account




Join Date: Jan 2014
Photos: Gallery
Posts: 76
I made Comparison of several lenses on 50mm

For a while I'm thinking about buying new DA 50/1.8. I dont know if I need one - so I just done one test.
Controlled light, tripod, ISO 100, same manual exposure, manual WB and six lenses that have 50mm FL. I made comparison charts, in full resolution are available on flickr. First picture is the scene (Olympus OM at f4), second is crop near the center and third is crop near the edge. It is absolutely without post proces. Only developed from RAW in ACR (set sharpening, contrast etc to 0).

Competitors are:
Pentacon 50/1.8 MC
Adapted Olympus OM 50/1.8 MC
DA* 50-135
DA 50-200 WR
DAL 18-55
DA 18-135 WR

My observations:
Olympus 50 is clearly best at any given aperture. It can be seen in center, but near edges it is more pronounced.
Second place shares Pentacon with DA*. Star is sharper in center, but Pentacon (is FF) near edges.
From other zooms is CENTER winner 18-135 and EDGE winner is kit DAL 18-55, I think.

So if I will finally decide to buy new DA50/1.8, I hope that will be on par with Olympus or better...





11-16-2014, 10:37 AM   #2
Veteran Member
LensBeginner's Avatar

Join Date: Sep 2014
Photos: Albums
Posts: 4,696
Very interesting work!
Although it's difficult to get unequivocal information from such tests, esp. regarding vignetting because of different transmittance of different lenses (and the lack of the full images).
I have the impression that the Olympus and DA* picture crops are much darker at f/1.8 and at f/2.8 than the Pentacon, for instance.
Olympus looks mighty good... how did you adapt it? Did you use an adapter or did a "Franken-lens" mount swapping job? Does the adapter have glass inside?
11-16-2014, 10:59 AM   #3
Site Supporter
Site Supporter
sergysergy's Avatar

Join Date: Jan 2011
Photos: Gallery
Posts: 5,155
Thanks for the comparison
11-16-2014, 11:05 AM   #4
Inactive Account




Join Date: Jan 2014
Photos: Gallery
Posts: 76
Original Poster
You are right. But I didn't care about vigneting in digital days. It is so easy to correct it in PP. If anyone want, I can upload whole images... In terms of T-stops, I noticed, that both primes have it probably better, than zooms - so, nothing new)

I adapted OM (but it is reversible). It is in this post:
https://www.pentaxforums.com/forums/122-lens-clubs/34323-zuiko-lens-club-3.html#post2869848

But only 50 is so easy to adapt...

11-16-2014, 11:07 AM   #5
Otis Memorial Pentaxian
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 42,007
QuoteOriginally posted by Jannis Quote
Olympus 50 is clearly best at any given aperture.
This would not be unexpected. As noted above, I am curious about how the Zuiko was adapted. Saw your later comment after I posted.


Steve

---------- Post added 11-16-14 at 10:15 AM ----------

QuoteOriginally posted by Jannis Quote
I hope that will be on par with Olympus or better...
I think you will find "different" to be an appropriate term. The DA 50/1.8 will be in the same league as far as sharpness, but will have its own flavor in other areas.


Steve
11-16-2014, 11:20 AM   #6
Veteran Member
LensBeginner's Avatar

Join Date: Sep 2014
Photos: Albums
Posts: 4,696
QuoteOriginally posted by Jannis Quote
You are right. But I didn't care about vigneting in digital days. It is so easy to correct it in PP. If anyone want, I can upload whole images... In terms of T-stops, I noticed, that both primes have it probably better, than zooms - so, nothing new)

I adapted OM (but it is reversible). It is in this post:
https://www.pentaxforums.com/forums/122-lens-clubs/34323-zuiko-lens-club-3.html#post2869848

But only 50 is so easy to adapt...
Interesting.
Thanks for the added info.
11-16-2014, 03:57 PM - 1 Like   #7
Inactive Account




Join Date: Jan 2014
Photos: Gallery
Posts: 76
Original Poster
QuoteOriginally posted by stevebrot Quote
I think you will find "different" to be an appropriate term.
Different is ok. I'm affraid that i I say: "Oh no, this AF50 is so worse than my decades older glass - so I will use the old one anyway" I hope, not...


QuoteOriginally posted by LensBeginner Quote
Did you use an adapter or did a "Franken-lens" mount swapping job? Does the adapter have glass inside?
I take a couple of snapshot of my "adapted" olympus lens.



11-17-2014, 10:42 AM   #8
Veteran Member
LensBeginner's Avatar

Join Date: Sep 2014
Photos: Albums
Posts: 4,696
QuoteOriginally posted by Jannis Quote
Different is ok. I'm affraid that i I say: "Oh no, this AF50 is so worse than my decades older glass - so I will use the old one anyway" I hope, not...

I take a couple of snapshot of my "adapted" olympus lens.

A neat job indeed!
11-17-2014, 12:33 PM   #9
Pentaxian
schnitzer79's Avatar

Join Date: Jul 2013
Photos: Albums
Posts: 1,248
Thx man. Great comparison
11-17-2014, 01:46 PM   #10
Pentaxian
ChristianRock's Avatar

Join Date: Jul 2013
Location: People's Republic of America
Photos: Gallery | Albums
Posts: 9,895
Great comparison. Too bad you didn't have a cheap M 50 1.7 to add to the results, I find it a great benchmark.
11-17-2014, 02:55 PM   #11
Veteran Member
LensBeginner's Avatar

Join Date: Sep 2014
Photos: Albums
Posts: 4,696
QuoteOriginally posted by ChristianRock Quote
Great comparison. Too bad you didn't have a cheap M 50 1.7 to add to the results, I find it a great benchmark.
It's "the" benchmark... how many of those were produced anyway? looks like everyone I know has one...
11-17-2014, 08:23 PM   #12
Otis Memorial Pentaxian
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 42,007
QuoteOriginally posted by LensBeginner Quote
It's "the" benchmark...
In more ways than one. At the time it was made, very few fast 50s were better and none at the same price point.


Steve
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!
50mm, center, comparasion, da, da*, edges, fifty, fifty prime lens, flickr, k-mount, mc, olympus, pentacon, pentax lens, sharpness, slr lens, steve, winner
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Field of view 35mm, 40mm, 50mm comparison shots? ChopperCharles Pentax SLR Lens Discussion 10 01-06-2014 06:06 PM
Aid i have pentax kx and several lenses of 20 years ago MANUELUNGO Troubleshooting and Beginner Help 4 11-25-2009 08:01 PM
Sharpest points of several lenses Erasmo Pentax SLR Lens Discussion 4 08-10-2008 07:28 AM



All times are GMT -7. The time now is 09:07 AM. | 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