Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-02-2011, 11:30 AM   #31
Pentaxian
Designosophy's Avatar

Join Date: Sep 2010
Location: Northeast Philadelphia
Photos: Gallery | Albums
Posts: 1,095
I have the FA 50/1.7 and the M 50/1.4. The M 50/1.4 isn't really relevant to this discussion, but I can say that, being accustomed to the bokeh of the f/1.4 lens, I am very happy with the 1.7. Here is a sample at f/2.0:




And here is a sample at 1.7. I took this photo specifically to examine bokeh/sharpness.



...with a 100% crop:



Caveat: My copy of the FA 50/1.7 has some fungus, so I imagine it could be sharper.

08-02-2011, 05:07 PM   #32
Veteran Member
Pentaxor's Avatar

Join Date: May 2009
Location: Vancouver, B.C.
Photos: Gallery
Posts: 6,513
QuoteOriginally posted by Designosophy Quote
I have the FA 50/1.7 and the M 50/1.4. The M 50/1.4 isn't really relevant to this discussion, but I can say that, being accustomed to the bokeh of the f/1.4 lens, I am very happy with the 1.7. Here is a sample at f/2.0:




And here is a sample at 1.7. I took this photo specifically to examine bokeh/sharpness.



...with a 100% crop:



Caveat: My copy of the FA 50/1.7 has some fungus, so I imagine it could be sharper.

to each his own and I do in fact prefer the 50/1.7's rendering.
08-03-2011, 07:55 AM   #33
Senior Member




Join Date: Aug 2010
Location: Pennsylvania
Posts: 258
QuoteOriginally posted by Designosophy Quote
And here is a sample at 1.7. I took this photo specifically to examine bokeh/sharpness.
drool worthy bokeh there
08-05-2011, 11:32 AM   #34
Senior Member




Join Date: Mar 2011
Posts: 119
QuoteQuote:
If you had to choose between these two lenses which one would you prefer?
I recently bought a F1.7, because it's cheaper, and everyone says they're both great. Also, I had a M1.7 that I liked; so I figured I'd like the F1.7. So far, I do.

08-05-2011, 01:01 PM   #35
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
Another way to look at it, and this applies to other focal lengths and apertures too: If within a certain lens line and at the same focal length, the slightly slower lens is about the same price as the faster one, then the faster one is probably the better value. If the slower lens costs notably less than the faster, then the slower may be the better value.

I emphasize 'value' -- faster glass is generally valued higher than slower glass. Lensmakers are reputed to put more effort into making faster vs slower lenses. A number I seem to recall is that every 1/3 f-stop requires 3x the design and construction resources. Something like that. Faster primes are more likely to be a maker's 'flagship' glass, as in: NOTHING is better than a K or A 50/1.2!! If an A50/1.2 and an A50/1.7 are within US$100 of each other, the f/1.2 is quite the better value. Pentax 50/1.7's are common and quite good. 50/1.2's are uncommon and great. And IMHO 50/1.4's are asymmetrically in-between: common and pretty great. And many others seem to agree, hence the usual price differential between these.

Everyone has their own preferences. And even mine vary. The Fifty that is *always* in my bag is a CZJ Tessar 50/2.8 (12 iris blades) that cost me all of US$7 shipped. There's nothing else quite like it, just as there's nothing else quite like my K50/1.2, but for totally different reasons. If I didn't have faster and odder 50-55's, I might carry the f/1.7-1.8's more often. (I'm a perv; I'll sometimes carry four different Fifty's at once.) And so it goes...
12-15-2011, 04:28 PM   #36
Veteran Member




Join Date: Jan 2010
Location: Durham, nc
Photos: Albums
Posts: 889
For me, it was a no brainer. I like very sharp lenses, and I found a *mint* copy of the F50 1.7 for $160, which is notably less than the normal going price. So far I've been shooting quite a bit wide open, and I'm very pleased with the lens. VERY pleased. I would however be interested in seeing comparison shots of the same subject between the 1.4 and 1.7 -- both lenses at f1.7.

Charles.
12-17-2011, 06:07 AM   #37
Veteran Member
danielchtong's Avatar

Join Date: Jul 2007
Location: Toronto
Posts: 770
QuoteOriginally posted by paperbag846 Quote
My big problem with the 1.7 is the bokeh. It's pretty harsh compared to the 1.4. ......The 1.7 is sharp, but the colour leaves something to be desired and I find the backgrounds rather harsh. Harsher, even, then my K 55 f1.8.











Would you call the background harsh?

Last edited by danielchtong; 12-17-2011 at 04:18 PM.
03-05-2013, 01:31 PM - 3 Likes   #38
New Member




Join Date: Apr 2012
Photos: Gallery
Posts: 5
SMC Pentax-M at F1.7, ISO 100

Just posting examples of the sharpness and bokeh using SMC Pentax-M at F/1.7 and K10d. No, image is not sharp at this stop, but the bokeh is glorious.

Attached Images
View Picture EXIF
PENTAX K10D  Photo 
View Picture EXIF
PENTAX K10D  Photo 
View Picture EXIF
PENTAX K10D  Photo 
View Picture EXIF
PENTAX K10D  Photo 
03-05-2013, 01:58 PM   #39
Pentaxian




Join Date: Jul 2010
Location: Oregon
Photos: Albums
Posts: 1,417
QuoteOriginally posted by RioRico Quote
Sharpness is a bourgeois conceit.
--Henri Cartier-Bresson
Cartier-Bresson's photos are fuzzy.
--Ansel Adams
03-05-2013, 02:17 PM   #40
Pentaxian




Join Date: Jul 2010
Location: Oregon
Photos: Albums
Posts: 1,417
QuoteOriginally posted by Blue Quote
And the F 50/1.4 is allegedly the best of the Quartet in sharpness etc.

Photodo scored the MTF of the F 50/1.4 at 4.6 tied with the F 50/2.8 macro and the F 50/1. at 4.4 and the FA 50/1.4 at 4.2. Those are good scores as were the specific scores. However, the also scored the A 50/2 at 4.0 which was a bit of a surprise. I would have guessed it to come in at 3.6 or 3.7.

Camera Lens Search - Find Camera Lenses

Keep in mind though that most tests are from single lens samples and is hardly statistical.
According to: http://www.takinami.com/yoshihiko/photo/lens_test/pentax_normal.html

the 50/2.8 is capable of considerably more resolution.
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, k-mount, pentax f 50mm, pentax lens, slr lens, vs fa 50mm
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
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
For Sale - Sold: Pentax *ist DL, FA 50mm f/1.4, DFA 100mm f/2.8 macro, DA 18-55mm, A 50mm f/2.0 chemxaj Sold Items 14 05-31-2010 09:34 AM
For Sale - Sold: Three Pentax SMC M-Series Lenses: 50mm/1.4, 50mm/1.7, 135mm/3.5! wallyb Sold Items 12 02-19-2010 01:24 PM
Whats A Better Fast Prime? The Sigma 50mm Or Pentax FA 50MM? Or Another Option? Christopher M.W.T Pentax SLR Lens Discussion 20 10-01-2009 08:02 AM



All times are GMT -7. The time now is 11:46 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