Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-05-2010, 08:07 PM   #46
Veteran Member
rparmar's Avatar

Join Date: Jan 2008
Photos: Gallery
Posts: 8,783
Original Poster
Nice look to that one!

11-06-2010, 12:14 AM   #47
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,612
QuoteOriginally posted by rparmar Quote
The purple fringing at f/1.2 can be severe
yes it can be bad, I would rate it as not being as bad as the FA77 about the same as the FA31 in terms of PF. The SMCP-K 50mm f/1.2 is streets ahead of the competing Canon 50mm f/1.2 which has significant purple fringing all the way to f/8. The Carl zeiss Planar 50mm f/1.4 is also a poor performer in terms of Purple Fringing - it seems to be a characteristic of contrasty lenses.
12-23-2011, 09:37 AM   #48
Veteran Member
Frogfish's Avatar

Join Date: Dec 2009
Location: Shanghai
Posts: 4,490
OK today I dropped off a lens for some TLC at the repair shop and as is my wont I traipsed around 5 floors of the camera mall to see what other used lenses were new in all the little retail shops. I came across a K50/1.2 on a K2 and the owner of the shop will split them (US$350 for the 50/1.2 and US$65 for the K2). I ran a few test shots and loved it, it's in lovely condition even if the focusing ring seems very firm (anyone's else's like this) ?

Oh woe is me ! I already have a Cosina 50/1.2 (I love that too) but like Peter (Axl) I'm just enamoured with low DoF and sweet OOF. So maybe the 77 can wait a little and I can pick this up next week. Anyone have any pearls of wisdom to tender ?
12-23-2011, 10:05 AM   #49
Loyal Site Supporter
baro-nite's Avatar

Join Date: Aug 2011
Location: North Carolina, USA
Photos: Gallery | Albums
Posts: 4,298
That's a rather good price, especially for the condition. My K lenses all have pretty firm focus rings, as compared to my M lenses. You can get a 77 any time. You're not going to lose money if you buy this one and then decide to sell it.

12-23-2011, 10:07 AM   #50
axl
Veteran Member




Join Date: Mar 2007
Location: Nove Zamky, Slovakia
Photos: Gallery | Albums
Posts: 7,181
K50 is worth every cent you pay for it. I only sold mine because for some weird reason I could not focus anything manually on my K-7. 77 is sharper up to 2.8, maybe even after that but in overall IQ the "old lady" spanks the Ltd.

My 2p
12-23-2011, 04:20 PM   #51
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,612
As I said earlier the PF from the Pentax 50mm f/1.2 isn't bad at all - even in broad daylight, at least with my copy of the lens. What strikes me as rather curious is there is a stop difference between the shutter speeds I set for the FA77 and 50mm but the image from the 50mm f/1.2 seems to be brighter by nearly 1/3 of a stop.



Wb set to 5000K - no alterations beyond the LR default RAW settings.

Last edited by Digitalis; 12-23-2011 at 04:27 PM.
12-24-2011, 03:01 AM   #52
Veteran Member
Frogfish's Avatar

Join Date: Dec 2009
Location: Shanghai
Posts: 4,490
QuoteOriginally posted by baro-nite Quote
That's a rather good price, especially for the condition. My K lenses all have pretty firm focus rings, as compared to my M lenses. You can get a 77 any time. You're not going to lose money if you buy this one and then decide to sell it.
Yep. I think so. I'm just about decided that this is the way to go.
12-24-2011, 03:03 AM   #53
Veteran Member
Frogfish's Avatar

Join Date: Dec 2009
Location: Shanghai
Posts: 4,490
QuoteOriginally posted by axl Quote
K50 is worth every cent you pay for it. I only sold mine because for some weird reason I could not focus anything manually on my K-7. 77 is sharper up to 2.8, maybe even after that but in overall IQ the "old lady" spanks the Ltd.

My 2p
Ha ha that doesn't help because I don't use my current f1.2 lens at anything over f2.0 ... max ! I found focusing it in the shop very easy, even with CIF (focusing from close to infinity). Thanks Peter.

12-24-2011, 03:09 AM   #54
Veteran Member
Frogfish's Avatar

Join Date: Dec 2009
Location: Shanghai
Posts: 4,490
QuoteOriginally posted by Digitalis Quote
As I said earlier the PF from the Pentax 50mm f/1.2 isn't bad at all - even in broad daylight, at least with my copy of the lens. What strikes me as rather curious is there is a stop difference between the shutter speeds I set for the FA77 and 50mm but the image from the 50mm f/1.2 seems to be brighter by nearly 1/3 of a stop.

Wb set to 5000K - no alterations beyond the LR default RAW settings.
So the 50 was set to f1.2 and the 77 to f1.8 with a faster shutter time of 1/1,600 to compensate for the one stop difference ? Or was the 50 also set to f1.8 ? I'm not quite sure what 's going on there !

Last edited by Frogfish; 12-24-2011 at 05:03 AM.
12-24-2011, 06:57 AM   #55
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,612
QuoteOriginally posted by Frogfish Quote
So the 50 was set to f1.2 and the 77 to f1.8 with a faster shutter time of 1/1,600 to compensate for the one stop difference ? Or was the 50 also set to f1.8 ? I'm not quite sure what 's going on there !
What shutter speed lets in one stop less light than 1/1600th? the correct answer is 1/3200th. Yes I had the pentax 50mm f/1.2 @ f/1.2 - the purple fringing from the pentax 50mm f/1.2 isn't anywhere near as bad as the FA77 and curiously still the image from the 50mm f/1.2 is slightly brighter than it should be.

Last edited by Digitalis; 01-03-2012 at 11:02 PM.
12-24-2011, 07:24 AM   #56
Pentaxian
hoanpham's Avatar

Join Date: Nov 2009
Location: Strand
Photos: Gallery | Albums
Posts: 1,361
I have both k50/1.2 and A50/1.2.
The samples from A50/1.2 are here
https://picasaweb.google.com/111102833818394930252/A50f12

Look at the photos of the motorbike. Taken at f1.2, 1.4 and 2.0. CA and PF at 1.2, but very ok at 2.0.
12-24-2011, 11:32 AM   #57
Veteran Member
Frogfish's Avatar

Join Date: Dec 2009
Location: Shanghai
Posts: 4,490
QuoteOriginally posted by Digitalis Quote
What shutter speed lets in one stop less light than 1/1600th? the correct answer is 1/3200th. Yes I had the pentax 50mm f/1.2 @ f/1.2 - the purple fringong from the pentax 50mm f/1.2 isn't anywhere near as bad as the FA77 and curiously still the image from the 50mm f/1.2 is slightly brighter than it should be.
Yes I got that as I suggested .... however the 50 shot didn't have an aperture value assigned to it so as I said I thought that was what you had done to compensate but wanted to be sure. I had noticed how bad the PF was on the 77 during in-shop testing (vs. the Sigma 85 which is at least as bad).

As for the 1/3 stop difference ... as I'm sure you know occasionally lenses aren't exactly the aperture they are purported to be, so that could easily be the 77 being a 1.9 or the 50 a 1.1.

One thing I did notice in the copy I looked at is that the blades didn't lay perfectly flat on top of each other .. is this normal ?
12-24-2011, 11:37 AM   #58
Veteran Member
Frogfish's Avatar

Join Date: Dec 2009
Location: Shanghai
Posts: 4,490
QuoteOriginally posted by hoanpham Quote
I have both k50/1.2 and A50/1.2.
The samples from A50/1.2 are here
https://picasaweb.google.com/111102833818394930252/A50f12

Look at the photos of the motorbike. Taken at f1.2, 1.4 and 2.0. CA and PF at 1.2, but very ok at 2.0.
Thanks HP. The shot of the iron railing against the brick wall is quite a compelling argument. Sharp, great bokeh and isolation .. exactly what I want.
12-24-2011, 04:29 PM   #59
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,612
QuoteOriginally posted by Frogfish Quote
One thing I did notice in the copy I looked at is that the blades didn't lay perfectly flat on top of each other .. is this normal ?
With my FA77 the blades lie perfectly flat.
12-24-2011, 08:51 PM   #60
Veteran Member
Frogfish's Avatar

Join Date: Dec 2009
Location: Shanghai
Posts: 4,490
QuoteOriginally posted by Digitalis Quote
With my FA77 the blades lie perfectly flat.
Sorry I was referring to the K50/1.2
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!
f/1.2, filter, hood, k-mount, lens, light, pentax lens, shot, shots, slr lens, test, tests
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
The real world difference f/1.4 -vs- f/2 Oscar1 Pentax SLR Lens Discussion 13 02-06-2010 10:33 PM
Some K-7 Real World images yakiniku Pentax DSLR Discussion 12 08-02-2009 09:13 PM
Snowflakes in the real world MightyMike Post Your Photos! 6 12-23-2008 06:40 AM
CA in the DA*16-50 vs Tamron 28-75 in real world 123K10D Pentax SLR Lens Discussion 10 02-23-2008 02:44 PM
Real world use. Rob.K Pentax DSLR Discussion 29 02-12-2007 01:26 PM



All times are GMT -7. The time now is 12:27 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