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+--- Thread: Nikkor 10 -24 D- unsharp edges repair? (/showthread.php?tid=3471)
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Nikkor 10 -24 D- unsharp edges repair? - scepko - 12-26-2010
My new Nikkor 10-24 mm has bad extreme corners resolution (Imatest MTF 0,17 only at radius 12,7 mm instead 0,43 Nikon web specification).
The resolution at all corners is appr the same, therefore I think that it is not the problem of lens centering. I am persuated that I have bought defective copy of Nikkor 10-24 mm. The practical test shots are in attachment (1:1 crops of center + all corners + all extreme corners).
Prague Nikon service recommended me to send lens for warranty repair (repair shoud be made at Nikon Europe Service, specialised for 10- 24 lens, after Nikon internals tests)
Has somebody experience with repair of simillar problem (Nikkor 10-24 symetrical poor extreme corners resolution)?
I am afraid to send new lens for such repair because I could not realize how could it made. I am afraid that the result of "repair" could be worse than the present state.
Many thank for relevant comments.
Nikkor 10 -24 D- unsharp edges repair? - Guest - 12-26-2010
For me, whenever a lens behaved poorly, it was asymmetrical. So, maybe what you're seeing is normal. Do things improve upon stopping down?
Nikkor 10 -24 D- unsharp edges repair? - scepko - 12-26-2010
Sharpnes at F 5,6 is only a litle better, see attachment.
I think that extreme corner resolution 15 lp/mm (MTF50) of my lens instead circa 30 lp/mm of reference lens is dramatically diference. I will be satiesfied with 25 lp/mm at F 3,5.
Nikkor 10 -24 D- unsharp edges repair? - Guest - 12-27-2010
My Nikon 10-24 has also bad corners at 10mm especially wide open, but I did not consider repair, they look ok at f/11. Also, it is ok at 12mm.
See my mini review of the lens at 10mm here: http://jtra.cz/stuff/review/nikkor10-24/index.html
Nikkor 10 -24 D- unsharp edges repair? - Guest - 12-27-2010
[quote name='pavol' timestamp='1293404804' post='5215']
Sharpnes at F 5,6 is only a litle better, see attachment.
I think that extreme corner resolution 15 lp/mm (MTF50) of my lens instead circa 30 lp/mm of reference lens is dramatically diference. I will be satiesfied with 25 lp/mm at F 3,5.
[/quote]
What's your reference lens? I think the lens photozone tested also only delivered 20 lp/mm (I hope my math is correct - 950 lwph, 24 mm image height, divide by two for line pairs) in the corners at 10 mm wide open.
Do you adjust for field curvature?
Nikkor 10 -24 D- unsharp edges repair? - Brightcolours - 12-27-2010
[quote name='pavol' timestamp='1293376453' post='5208']
My new Nikkor 10-24 mm has bad extreme corners resolution (Imatest MTF 0,17 only at radius 12,7 mm instead 0,43 Nikon web specification).
The resolution at all corners is appr the same, therefore I think that it is not the problem of lens centering. I am persuated that I have bought defective copy of Nikkor 10-24 mm. The practical test shots are in attachment (1:1 crops of center + all corners + all extreme corners).
Prague Nikon service recommended me to send lens for warranty repair (repair shoud be made at Nikon Europe Service, specialised for 10- 24 lens, after Nikon internals tests)
Has somebody experience with repair of simillar problem (Nikkor 10-24 symetrical poor extreme corners resolution)?
I am afraid to send new lens for such repair because I could not realize how could it made. I am afraid that the result of "repair" could be worse than the present state.
Many thank for relevant comments.
[/quote]
While the Nikon 10-24mm is not super at 10mm, it is not particularly bad either, and I have not seen it this bad as your examples. As far as I know, this is not normal at all, the lens should still be reasonably sharp in the corners.
I do not think any "repair" can make this worse, and if they find they can not repair it they just might give you a new lens.
Nikkor 10 -24 D- unsharp edges repair? - scepko - 12-27-2010
[quote name='BG_Home' timestamp='1293452692' post='5226']
What's your reference lens? I think the lens photozone tested also only delivered 20 lp/mm (I hope my math is correct - 950 lwph, 24 mm image height, divide by two for line pairs) in the corners at 10 mm wide open.
Do you adjust for field curvature?
[/quote]
Yes, at Imatest measurement I eliminate curvature by the local Live View focusing.
Nikkor 10-24 is DX lens for the sensor "24 x 16". Therefore is Fhotozone test result at extreme corner much better: 920 LWPH/15,8mm/2 = 30lp/mm !!!
I consider as "reference lens" Nikon specification at Nikon web: http://imaging.nikon.com/products/imaging/lineup/lens/zoom/widezoom/af-s_dx_10-24mmf_35-45g_ed/index.htm
Nikkor 10 -24 D- unsharp edges repair? - scepko - 12-27-2010
[quote name='jtra' timestamp='1293409424' post='5217']
My Nikon 10-24 has also bad corners at 10mm especially wide open, but I did not consider repair, they look ok at f/11. Also, it is ok at 12mm.
See my mini review of the lens at 10mm here: http://jtra.cz/stuff/review/nikkor10-24/index.html
[/quote]
I know your mini review. I apreciate its high.
Your lens seems me MUCH BETTER as my.
In case you will send me raw files I could try to evaluate your test shots by Imatest. It is enought to send (place om your web) four (for beginning only one?) extreme cornes shots of test chart at F 3,5.
Nikkor 10 -24 D- unsharp edges repair? - Guest - 12-28-2010
Sorry, but @10mm wide open, corner softness such as this does not come exactly unexpected. looks entirely within expectations . Dont expect to measure same the lp/mm as Nikon does. Only they know under what conditions these reults ca be reached.
Nikkor 10 -24 D- unsharp edges repair? - Brightcolours - 12-28-2010
[quote name='jenbenn' timestamp='1293562947' post='5252']
Sorry, but @10mm wide open, corner softness such as this does not come exactly unexpected. looks entirely within expectations . Dont expect to measure same the lp/mm as Nikon does. Only they know under what conditions these reults ca be reached.
[/quote]
That is not exactly true, try finding an f3.5 10mm sample online with that bad corners of this lens... you will find it hard.