Do I need to replace my lens?

[eternalSun]

hmm ok maybe i try to take another shot with both lens. this time i will set +2 flash compensation. i was in a hurry for the kit lens pic and the tripod wasn't v stable due to the heavier lens i think. will reshoot and try again. thanks for the patience....

 

[daredevil123]

you've forgotten the paper is white and which fill up the whole frame, for such situation, +2 flash compensation will have better result.

That is true ben. But even without +2, I shot one and it is a lot brighter than TS's shots... I got a feeling his FV is not zero...

This is my shot at EV = 0. FV = 0, onboard flash, A mode, aperture = 5.6, auto ISO (ended up cam selected 1600). D300s, which essentially has the same sensor as the D90. SOOC jpeg.

 

[eternalSun]

Finally got my internet back on!!! Indeed my ev wasn't 0. anyway here is the 50mm 1.4d. it seems that both my kit lens and the 50mm are slightly back focused. not sure if it is me or something else....is there a possibility that the issue is with my d90 instead of the lens???

50mm, 1/50s, f1,4, iso200, tripod, timer 10s, flash, 0ev

 

[tweakmax2]

Btw how to adjust FV ?

 

[daredevil123]

Finally got my internet back on!!! Indeed my ev wasn't 0. anyway here is the 50mm 1.4d. it seems that both my kit lens and the 50mm are slightly back focused. not sure if it is me or something else....is there a possibility that the issue is with my d90 instead of the lens???

50mm, 1/50s, f1,4, iso200, tripod, timer 10s, flash, 0ev

If both your lenses are slightly backfocused, it means your camera is backfocusing. This can be adjusted easily. The access to the adjustment allen-key hole is behind the mirror on the side. If you are not very confident of doing it yourself, bring it to NSC to let them do it for you. Just tell they all your lenses are backfocusing on your camera. If the D90 is under warranty, then the adjustment should be free.

 

[daredevil123]

Btw how to adjust FV ?

It dffers from camera to camera. Best is to look up in your camera manual.

 

[eternalSun]

Hi daredevil123, will head down NSC to ask them to help me double check on the back focusing. If my camera indeed is back focusing, it will result in the 50mm being soft? Cos I look at the image taken and I don't really see any part that is sharp....

 

[daredevil123]

Hi daredevil123, will head down NSC to ask them to help me double check on the back focusing. If my camera indeed is back focusing, it will result in the 50mm being soft? Cos I look at the image taken and I don't really see any part that is sharp....

Actually no. The 50 should be quite sharp especially when stopped down. Did you try shooting at f1.8 or f2? Most lenses are not at its sharpest wide open.

 

[eternalSun]

I haven't really done alot of testing on the lens stopped down to f1.8 or f2. Just got the lens during last weekend. Hearing from the feed back I was expecting the lens to be a lot sharper even at wide open. Maybe I was expecting too much. That's why wanted to ask all the seniors here if that amount of softness at wide open is normal for this lens

 

[daredevil123]

I haven't really done alot of testing on the lens stopped down to f1.8 or f2. Just got the lens during last weekend. Hearing from the feed back I was expecting the lens to be a lot sharper even at wide open. Maybe I was expecting too much. That's why wanted to ask all the seniors here if that amount of softness at wide open is normal for this lens

You definitely have backfocus issue with your cam, which contributes to the impression of softness.

But from your pictures, I also feel you do not have a good enough understanding of your camera basics to get a good accurate shot for us to make an accurate guess.

So it is best for you to send both your cam and lens into NSC.

 

[eternalSun]

I see. Still trying to learn more about photography. Mind pointing out which area I'm lacking??

 

[daredevil123]

I see. Still trying to learn more about photography. Mind pointing out which area I'm lacking??

Understand how your camera works and the basic functionality. How to get a proper exposure for different scenes, sometimes the dominant colors in a scene can fool the metering feature. Also how to use flash and how to use it to get a proper exposure. And how iso comes into play, as hi iso cangive rise to noise and after NR can reduce sharpness. Also if a picture is underexposed, it can also give the impression that it is not sharp because good contrast will give the impression of better sharpness.