New DA 50mm F1.8


Moonlightsg

Senior Member
Jan 28, 2010
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#1
Hi, looks like it on sell for a week, any comment on it?
 

fengwei

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Aug 25, 2004
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#2
Never see one, never hold one, no comment :bsmilie:

Might be able to get one next week. Stay tuned ;)
 

Lightbulb

New Member
Jun 17, 2011
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#3
Tried it, it looks as sturdy as the 35/2.4 but AF not as fast. Wasn't sharp at various f stops so likely needed calibration but I wouldn't want to risk it so didn't buy it.
 

PhilipKr35

Senior Member
Jul 17, 2011
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#6
Tried it, it looks as sturdy as the 35/2.4 but AF not as fast. Wasn't sharp at various f stops so likely needed calibration but I wouldn't want to risk it so didn't buy it.
I have same issue, AF not fast on the Kr versus DA35/2.4 . There is also focussing off the mark for an object 2-3 metre away, I am not sure if it is my Kr or the lens but I have not been able to get sharp image in good light and lousy focus in low 6-7pm low light. Would post some shots tonight. tried fine tune adjustment focus +/-1,2,3 , does not seem to be out of focus actually as +/-1,2 the image is blurred more.

Need help !

Thanks.
 

Lightbulb

New Member
Jun 17, 2011
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#7
Sorry to hear that. For me I try focus on contour subject and do AF adjustment accordingly until where ever I point the sharpness is good. Primitive but works fine for me. Perhaps you may try Google to find better way on AF adjustment.
 

PhilipKr35

Senior Member
Jul 17, 2011
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#8
#1 Spider not in focus, any advise ? - Kr focus spot on spider DA50mm f2.5 1/1600 ISO200 centre weighted exposure

https://picasaweb.google.com/lh/photo/9XHNGrK8_Nl8btdYmB2N5do2K5I84LAGg2wP9iDqNk4?feat=directlink

#2 Fake Orchid sharp in small centre area only - looks acceptable ? Kr focus spot yellow stigma DA50mm f1.8 1/250 ISO200 multiple segments exposure

https://picasaweb.google.com/lh/photo/aaI7nADsmEdQ3jpihakLNto2K5I84LAGg2wP9iDqNk4?feat=directlink

#3 Flower evening(7:20pm)low light outdoor,seems not able to get sharp - slow shutter speed - any advise?, K01 focus spot into opening flower tube DA50mm f2.5 1/13 ISO800 centre weighted exposure,


https://picasaweb.google.com/lh/photo/fpYcJh4Y2HHnLttwV_7n4do2K5I84LAGg2wP9iDqNk4?feat=directlink

Thank you.
 

CorneliusK

Senior Member
Jan 23, 2010
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#9
Try taking a few pics in live view mode. Live view af is slower but usually more accurate than regular af, and it is not dependent on any fine tuning. You should be able to determine how sharp the lens is wide open without any doubt from the af
 

wrx_sti_22b

Senior Member
Apr 14, 2005
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#10
Seems not worth the money to me... my FA 35mm f2.0 lens that i bought recently is way more superior.
 

Jan 28, 2004
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#11
PhilipKr35 said:
#1 Spider not in focus, any advise ? - Kr focus spot on spider DA50mm f2.5 1/1600 ISO200 centre weighted exposure

https://picasaweb.google.com/lh/photo/9XHNGrK8_Nl8btdYmB2N5do2K5I84LAGg2wP9iDqNk4?feat=directlink

#2 Fake Orchid sharp in small centre area only - looks acceptable ? Kr focus spot yellow stigma DA50mm f1.8 1/250 ISO200 multiple segments exposure

https://picasaweb.google.com/lh/photo/aaI7nADsmEdQ3jpihakLNto2K5I84LAGg2wP9iDqNk4?feat=directlink

#3 Flower evening(7:20pm)low light outdoor,seems not able to get sharp - slow shutter speed - any advise?, K01 focus spot into opening flower tube DA50mm f2.5 1/13 ISO800 centre weighted exposure,

https://picasaweb.google.com/lh/photo/fpYcJh4Y2HHnLttwV_7n4do2K5I84LAGg2wP9iDqNk4?feat=directlink

Thank you.
The leaf on the right seems to be in-focus and nothing else, that is how shallow the dof is, especially if the subject distance is pretty close to the lens.

You might want to do some focus tests with an easier subject to see how much dof you have and the af accuracy too.

You might want to bump up your iso a bit at 1/13 if not held stabily contributes (especially with a short tele) to soft pics.
 

pinholecam

Moderator
Staff member
Jul 23, 2007
10,944
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#12
#1 Spider not in focus, any advise ? - Kr focus spot on spider DA50mm f2.5 1/1600 ISO200 centre weighted exposure

https://picasaweb.google.com/lh/photo/9XHNGrK8_Nl8btdYmB2N5do2K5I84LAGg2wP9iDqNk4?feat=directlink

#2 Fake Orchid sharp in small centre area only - looks acceptable ? Kr focus spot yellow stigma DA50mm f1.8 1/250 ISO200 multiple segments exposure

https://picasaweb.google.com/lh/photo/aaI7nADsmEdQ3jpihakLNto2K5I84LAGg2wP9iDqNk4?feat=directlink

#3 Flower evening(7:20pm)low light outdoor,seems not able to get sharp - slow shutter speed - any advise?, K01 focus spot into opening flower tube DA50mm f2.5 1/13 ISO800 centre weighted exposure,


https://picasaweb.google.com/lh/photo/fpYcJh4Y2HHnLttwV_7n4do2K5I84LAGg2wP9iDqNk4?feat=directlink

Thank you.

These are pretty challenging situations with lots of possible factors affecting the photos.
Furthermore, DOF may be too thin for some shots.
#1 - Spider on web. Easily moved with light gusts of wind. Not to mention that perhaps you are not at your most steady. DOF too thin for such shots.

#2 - The center of the flower is somewhat 'dimensional' with protruding parts. This can confuse AF to focus on the wrong part of the focus area. Again, its hard to determine if there was no wind or human error in the shot. DOF is thin, its expected.

#3 - 1/13 shutter speed is certainly not a good way to check sharpness or focus.

I suggest you try on something more controlled and 2D, like a text on a book cover or something of that sort.
Use a tripod and use the self-timer or remote for shutter release.
Eliminate the possible sources of error first.
 

Last edited:

PhilipKr35

Senior Member
Jul 17, 2011
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#13
Thanks for input,would try out suggestions.
Maybe I could line up AA batteries and check DOF and AF.

I had a manual K 50mm f1.7 lens before and it was able to capture very good bright images in poor light conditions when wide open.

Thanks , would report back again.
 

fengwei

Moderator
Staff member
Aug 25, 2004
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#14
Just go out and take some real photos, see how the lens works for you. This kind of test has to be done under controlled environment and settings.
 

PhilipKr35

Senior Member
Jul 17, 2011
1,628
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#16
fengwei said:
Just go out and take some real photos, see how the lens works for you. This kind of test has to be done under controlled environment and settings.
Photos #1,2,3 are all first week real shots taken. Would have to take more shots to get use to the lens DOF. I purchased this f1.8 lens was hoping to take indoor shots without flash but the shutter is too slow to hand held on Kr. Perhaps on a K5 the shutter speed may be faster at low ISO.
 

Jan 28, 2004
276
0
16
#17
Photos #1,2,3 are all first week real shots taken. Would have to take more shots to get use to the lens DOF. I purchased this f1.8 lens was hoping to take indoor shots without flash but the shutter is too slow to hand held on Kr. Perhaps on a K5 the shutter speed may be faster at low ISO.
Uhm no, given the same iso aperture and metering pattern, speed should be the same for the same exposure.

Like I said bump your exposure, use flash or have a stable base.
 

Scalpel22

New Member
Feb 14, 2010
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#18
Photos #1,2,3 are all first week real shots taken. Would have to take more shots to get use to the lens DOF. I purchased this f1.8 lens was hoping to take indoor shots without flash but the shutter is too slow to hand held on Kr. Perhaps on a K5 the shutter speed may be faster at low ISO.
Shutter too slow? Think you could be using aperture mode with F1.8 but in a low light condition. Thats why the shutter speed needs to be slower. Try TAv mode. 1/13 really needs you to be very still.
 

Lightbulb

New Member
Jun 17, 2011
257
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#19
In the case of my K5, when I select Av mode the shutter automatically choose a number that is quite usable for stationary subject.
 

pinholecam

Moderator
Staff member
Jul 23, 2007
10,944
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#20
Photos #1,2,3 are all first week real shots taken. Would have to take more shots to get use to the lens DOF. I purchased this f1.8 lens was hoping to take indoor shots without flash but the shutter is too slow to hand held on Kr. Perhaps on a K5 the shutter speed may be faster at low ISO.
It goes back to understanding the basics right?
ISO/Shutter speed/Aperture
Without first understanding the basics of exposure its just literally shooting in the dark.

Try this as a resource:
One on One: EP 0 - YouTube

Plenty of episodes to learn from.
 

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