Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-20-2007, 12:44 AM   #1
Forum Member
Kentax's Avatar

Join Date: Dec 2007
Location: CA
Photos: Gallery
Posts: 98
Pentax-FA 50mm 1.4 vs Pentax-M 50mm 1.7 Image Quality

Did a side by side comparison of the FA 1.4 and M 1.7 today and noticed the images from the 1.4 were softer then the 1.7. Is it possible I received a defective lens? Or does the 1.7 produce sharper images?


Edit: Had time on my hands today so i did a comparison of the 50mm Pentax-FA 1.4, Pentax-M 1.7, Pentax-A 2.0, and a cheap e-bay Cosinon-S 50mm 2.0 lens

Lenses taken at 2.8

FA1.4 @ 2.8



M1.7 @ 2.8



A2.0 @ 2.8



C2.0 @ 2.8



Lenses taken at 4.0

FA1.4 @ 4.0



M1.7 @ 4.0



A2.0 @ 4.0



C2.0 @ 4.0



Lenses taken at 5.6

FA1.4 @ 5.6



M1.7 @ 5.6



A2.0 @ 5.6



C2.0 @ 5.6



Lenses taken at 8.0

FA1.4 @ 8.0



M1.7 @ 8.0



A2.0 @ 8.0




Last edited by Kentax; 12-20-2007 at 08:08 PM. Reason: more lenses and photos
12-20-2007, 01:25 AM   #2
Ole
Administrator
Ole's Avatar

Join Date: Sep 2006
Location: Copenhagen, Denmark
Photos: Gallery | Albums
Posts: 3,885
Here is a related discussion on your topic which might be of help:

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/16753-thoughts-fa-50mm-1-7-a.html
12-20-2007, 04:39 AM   #3
Veteran Member
creampuff's Avatar

Join Date: May 2007
Location: Singapore
Photos: Gallery
Posts: 3,955
Too close to call. But more interestingly the M lens definitely renders a cooler tone.
12-20-2007, 10:17 AM   #4
Senior Member




Join Date: Nov 2007
Location: Bay area, CA
Photos: Gallery
Posts: 192
QuoteOriginally posted by Kentax Quote
Did a side by side comparison of the FA 1.4 and M 1.7 today and noticed the images from the 1.4 were softer then the 1.7. Is it possible I received a defective lens? Or does the 1.7 produce sharper images?
I have an FA 50 and a M 50 version. I do find the f1.4 softer wide open than the f1.7 wide open, they look the same as f2.8 and up (razor sharp) Generally it's true for most lens that they aren't at their best wide open.

Also, my FA-50 front-focus ever so slightly. I don't think it's really the camera since my Sigma17-70 has razor sharp pinpoint focus, that makes a big diff when shots are taken wide open.

Did you take the test shot wide open or with same aperture?

12-20-2007, 03:08 PM   #5
Forum Member
Kentax's Avatar

Join Date: Dec 2007
Location: CA
Photos: Gallery
Posts: 98
Original Poster
i shot them wide open. thanks for the replies, i will do another comparison with the lenses at the same aperture soon.

Edit: continue from original post

C2.0 @ 8.0



Lenses wide open


FA1.4 @ 1.4



M1.7 @ 1.7



A2.0 @ 2.0



C2.0 @ 2.0


Last edited by Kentax; 12-20-2007 at 08:14 PM.
05-09-2009, 04:06 AM   #6
Veteran Member
ytterbium's Avatar

Join Date: Jan 2008
Posts: 1,076
Is it just me, or you've written that "...images from the 1.4 were softer then the 1.7."
But in your first post i see FA1.4 tack sharp at 2.8 in first image, with very soft M1.7@2.8 in the following (second) image.
05-09-2009, 04:19 AM   #7
Senior Member




Join Date: Dec 2008
Location: Grand Rapids, MI. USA. Earth.
Posts: 139
QuoteOriginally posted by ytterbium Quote
Is it just me, or you've written that "...images from the 1.4 were softer then the 1.7."
But in your first post i see FA1.4 tack sharp at 2.8 in first image, with very soft M1.7@2.8 in the following (second) image.
Yes, I see the same. The FA looks the sharpest in all the tests.
05-09-2009, 04:42 AM   #8
Pentaxian
8540tomg's Avatar

Join Date: Feb 2008
Location: Waterloo, Ontario
Photos: Gallery
Posts: 4,454
FA is the winner hands down in every image. The M to my eye looks a bit out of focus.

Tom G

05-09-2009, 04:50 AM   #9
Veteran Member
ytterbium's Avatar

Join Date: Jan 2008
Posts: 1,076
Unless there is some mismatch between pictures, labels and description.
Odd that the previous posters dosnt seem to notice it. Second post with wide open images looks more like description (FA and M is at least equal sharpness).
05-09-2009, 05:39 AM   #10
Veteran Member




Join Date: Jan 2009
Location: Canada
Posts: 1,255
QuoteOriginally posted by ytterbium Quote
Unless there is some mismatch between pictures, labels and description.
Odd that the previous posters dosnt seem to notice it. Second post with wide open images looks more like description (FA and M is at least equal sharpness).
Yeah, the labels make no sense.

Here's M f/1.7 supposedly at "f/1.7":



And here it's at "f/8":
05-09-2009, 05:42 AM   #11
Pentaxian
bdery's Avatar

Join Date: Mar 2008
Location: Quebec city, Canada
Photos: Gallery
Posts: 5,831
I'd say that impresses me is that the Sosinon performs pretty darn well!

The M underperforms, compared to what I have read elsewhere. Maybe your MF was not on par?
05-09-2009, 05:47 AM   #12
Veteran Member




Join Date: Jan 2009
Location: Canada
Posts: 1,255
QuoteOriginally posted by bdery Quote
I'd say that impresses me is that the Sosinon performs pretty darn well!

The M underperforms, compared to what I have read elsewhere. Maybe your MF was not on par?
It's (EDIT: also) likely that the images are all mixed up. M is defying the laws of physics by being supposedly sharper at f/1.7 and softer at f/8.
05-09-2009, 06:14 AM   #13
Inactive Account




Join Date: Mar 2007
Location: Barrie, Ontario, Canada
Posts: 421
There is definately something wrong with the "M" shots. They're not anywhere near as sharp as I would expect. It should be on-par with the FA50.

- Andrew
05-09-2009, 09:54 AM   #14
Veteran Member
alexeyga's Avatar

Join Date: Dec 2008
Location: Montreal, Canada
Posts: 838
QuoteOriginally posted by AndrewShirley Quote
There is definately something wrong with the "M" shots. They're not anywhere near as sharp as I would expect. It should be on-par with the FA50.

- Andrew
I'd have to agree... FA50/1.4 was a disappointment for me in terms of sharpness in comparison to my old A50/1.7... Wide open it is... And I was dumb enough to sell the A... That gave me a good reason to unload the FA50 and get the K50/1.2 instead....
05-09-2009, 11:19 AM   #15
Inactive Account




Join Date: Mar 2007
Location: Barrie, Ontario, Canada
Posts: 421
Ah yes, the legendary and elusive 1.2. I would love to see shots with it.

- Andrew
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, 50mm 1.4 vs, fa1.4, k-mount, lenses, m1.7, pentax lens, pentax-fa 50mm, slr lens, vs pentax-m 50mm
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax K-5 vs Nikon D7000 image quality seliscan Pentax K-5 5 11-02-2010 01:54 AM
For Sale - Sold: SMC Takumar 50mm 1.4 / Pentax-A 50mm 1.7 / Pentax-M 50mm 1.4 (US) JP_Seattle Sold Items 3 09-02-2010 06:17 PM
Pentax Optio A30 image quality falconeye Pentax Compact Cameras 2 10-16-2008 10:36 AM
For Sale - Sold: FS: Pentax 50mm F2.0 and Auto Image(Rebranded Vivitar) 28mm F2.8 quickpix Sold Items 13 03-08-2008 09:06 AM
40mm 2.8 vs 50mm 1.4 -- image quality filmamigo Pentax SLR Lens Discussion 5 10-25-2007 12:39 PM



All times are GMT -7. The time now is 07:40 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