Pentax fa 1.7 50mm


DanielH

Link Posted 17/08/2011 - 19:38
Got hold of the above lens for my K-R (my first prime) but am not happy with the sharpness/fine focus particularly below f2.8. I have tried adjusting focus in camera settings but it makes no difference. Is this because older lenses don't support this? Not sure now if i should sell it and get the newer 1.4 version.

Any advice appreciated

Dan

JohnX

Link Posted 17/08/2011 - 19:48
It should work/focus fine on your K-r.

What have you compared it with? Could you post some sample shots?

beginner

Link Posted 17/08/2011 - 20:54
Mine's razor sharp!... Try using your eye's to focus rather than waiting for the focus light to come on...I found it was much better than the camera telling me it was in focus!....good luck

Ken
K20D...ist DS ,DA18/55,DA16/45.DA* 50/135,"A"1.7 50MM..."A" 70/210..M 50mm f2...Tamron 90mm macro,28/300 Tamron,200/500 Tamron 6.9....A Pentax DA*300... Sigma10/20,FA31mm 1.8 Ltd*********,FA 77mm Ltd!
Last Edited by beginner on 17/08/2011 - 21:00

geordie01

Link Posted 17/08/2011 - 21:49
beginner wrote:
Mine's razor sharp!... Try using your eye's to focus rather than waiting for the focus light to come on...I found it was much better than the camera telling me it was in focus!....good luck

Ken

i agree

Dangermouse

Link Posted 17/08/2011 - 23:27
If the camera isn't finding focus with the f1.7 then it's likely to be even worse with the f1.4.

Is any point in the images sharp? I'm just thinking the camera may be locking focus on a point other than that which you intend, and at f1.7 that's a very tight distinction.
Matt

Shooting the Welsh Wilderness with K-m, KX, MX, ME Super and assorted lenses.

Smeggypants

Link Posted 18/08/2011 - 03:49
Dangermouse wrote:
If the camera isn't finding focus with the f1.7 then it's likely to be even worse with the f1.4.
.

Well that's true, but the point is to calibrate the AF.


I have a FA 50/1,4 and a Sigma 30/1.4 and I've calibrated the AF on ech and it works fine.

You cannot rely upon the standard focus screen to manually focus at 1.4 anyway as they cannot resolve DOFs that shallow.

if you want accuracy when focussing at 1.4 then use Live view magnified, get a replacement focus screen that can show it or calibrate the AF
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283

DanielH

Link Posted 18/08/2011 - 18:59
Thats the problem I have. I've discovered that the lens focuses in front of the af spot but i can't adjust it, the settings don't appear to make any difference! what can i do?

kingfisher

Link Posted 18/08/2011 - 19:56
FA 50/1.4 is not going to be sharper than FA 50/1.7, only significantly more expensive. If I were you I would keep FA50/1.7 and try to work out AF calibration as was mentioned...
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