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PostPosted: Sat Dec 13, 2008 10:03 pm 
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Next up some remarks on focus:
- the travel of the focus ring is huge: >180° for a non-macro lens :shock:
- for a full run the motor needs about 3/4 of a second (not scientifically measured). That's surely not the fastest :?
- as already mentioned: sometimes focus is just off. Check your photos for critical sharpness! :(
- play in the gear is minimal (much better as in my AF 85/1.8!) :)
- focussing from infinity or 45cm yields almost identical results :)

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PostPosted: Sun Dec 14, 2008 6:59 am 
Odd that a non-macro would have such a long travel for the focus ring and not focus fast. BTW, does this newer 50mm improve on the minimum focus distance?


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PostPosted: Sun Dec 14, 2008 8:04 am 
How well does the lens focus in low light? Any focus hunting or does it nail the focus everytime with little fuss?


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PostPosted: Sun Dec 14, 2008 11:53 am 
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@Graham: It's still 45cm at the closest :? And IQ is visibly deteriorating that close. So stop the lens down to at least f/5.6 if you want any decent close-up IQ!
@pgtips: No hunting has haunted me yet. But perhaps I didn't try it dark enough :wink:

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PostPosted: Sun Dec 14, 2008 1:34 pm 
Thanks for the info Thomas. Btw, why would the IQ drop when focusing on close subjects? I don't understand why it would.


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PostPosted: Sun Dec 14, 2008 1:45 pm 
Thanks Thomas.


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PostPosted: Sun Dec 14, 2008 1:56 pm 
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@pgtips: As this is not a macro lens it is not specifically corrected for close-ups. That's also the reason why Nikon limited the closest focus-distance. So even if you could use extension-tubes, don't try it!

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PostPosted: Sun Dec 14, 2008 2:01 pm 
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Thomas, does such a long focus ring turn allow for precizer focus on f/1.4, or is it just because of the new design?

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PostPosted: Sun Dec 14, 2008 2:17 pm 
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I think the long focus-travel is owed to the extraordinary precision you need to apply (personally or via SWM) when focussing at f/1.4.

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PostPosted: Mon Dec 15, 2008 2:22 am 
Thomas wrote:
I think the long focus-travel is owed to the extraordinary precision you need to apply (personally or via SWM) when focussing at f/1.4.


Without actually using it yet, I think that's a great feature. I often find that my 50 f/1.8 lacks the accuracy to focus accurately at f/1.8 with the focus ring.


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PostPosted: Mon Dec 15, 2008 5:22 pm 
Great review, like always! Cheers Thomas!

Honestly i think this lens looks REALLY sweet!

Drolling over here....

And is this a keeper Thomas?


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PostPosted: Wed Dec 17, 2008 8:58 am 
Hi Thomas,

I got mine yesterday. I have had problems with the AF of my S5 and by what I have read in various fourms around the world, the conclusion I drew myself seems to be right: it has problems with several older, non AF-S lenses as well as with some lenses from 3rd party manufactures. I never had problems with genuine Nikkor AF-S lenses.

So I was a bit surprised to see some randomness in focus accuracy with the new 50mm. My AF-D 50mm F1.8, albeit beeing a non af-s lens, was very sure in that regard. I am somehow reliefed that this issue isn't dedicated to the S5, so the rule of having no body-caused problems with AF-S lenses persists.

I still have to validate the effects in real life photos. A perfect oportunity will arise on friday when my cam and the new 50mm will be given in the hands of a friend of mine which isn't very skilled in camera operation but needs a light efficient prime lens & cam combination for a theatre performance. I'll have a closer look into the results.

BTW, this body AF problem was the reason I put the telezoom story on hold. The Tamron AF inconsistence might have been a problem of the S5, as well as the inconsistence of the AF-D 80-200mm I tested later on (which whould have been a keeper otherwise). The only obvious solution in this regard seems to be the AF-S VR 70-200mm which is over my budget. I hope to get a good deal once the new version appears on the market. Until then, I'll return to my principle of using primes whenever a proper version exists.

Best regards,
Christian


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PostPosted: Wed Dec 17, 2008 12:54 pm 
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Interesting observation, Christian! I'll come to focus-consistence after I've shot more. In the testcharts the delta between focussing on a target with the lens coming from infinity vs coming from 45cm seems minimal, but still can cause some color shift from redish to greenish bokeh at f/1.4 as this lens has longitudinal CAs (not too bad in my opinion).
But shooting on a three-dimensional subject like a tree you have to be very careful to understand where the AF-system thinks the least phase-shift is :roll:

@Alex: I'll definitely keep this lens!
@pgtips: This early morning I was runnning around in a cold and foggy dawn with EVs around 1/30 sec, f/1.4, ISO 640. I did not observe any hunting from the lens. With the close-up IQ I cannot prove it as my testchart doesn't have enough resolution for testing around or beyond 1:10.

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Last edited by Thomas on Wed Dec 17, 2008 2:19 pm, edited 1 time in total.

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PostPosted: Wed Dec 17, 2008 2:15 pm 
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Now here's one captured this cold and gray December morning. At 1/45 sec (handheld!), f/1.4 (!), ISO 200, -1EV, picture-mode=vivid, focus=AF. Post-processing: cropping and some curves. I've converted this to jpg unsing CaptureNX2 and saved it with highest quality setting in full resolution. Just click through the image to delve into every single pixel this lens could throw on the D300 sensor - which still has a higher pixel densitiy than the fabulous new D3x :wink:

Doorstep:
Image

I'm very happy :D
I hope you enjoy this image too!

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PostPosted: Wed Dec 17, 2008 3:02 pm 
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it certainly brings the holiday feelings to me, looks great hope to see more coming this christmas :lol:

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