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#1 Jeff

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Posted 02 November 2008 - 05:00 AM

Lately when I put my D200 in the 7 area wide frame mode my 70-300 VR lens won't focus correctly. It goes to infinity and stays there. Has anyone else had this problem? Is there another setting I need to change when I go to this mode? Thanks for any help. Jeff
[font=Arial][size=1]
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#2 james23p

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Posted 02 November 2008 - 06:38 AM

Hmm Jeff I have not run across this but I will give it a try later on my D200 and see what I get. Jim

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#3 mule_patterson

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Posted 02 November 2008 - 09:41 AM

I won't attempt to know the exact answer, but long teles are famous for hunting out sufficiane contrast to lock onto and focus quickly. Many shooters use a manual approach to keep from 'waiting' on the lens to do the job itself - pro glass will limit your distance range to speed up the process, but it's no a foolproof solution at all times. My 70-200 VR does quite well in this regard but I'm convinced it's due to the larger aperture mostly. Mule
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#4 Jeff

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Posted 02 November 2008 - 03:37 PM

I won't attempt to know the exact answer, but long teles are famous for hunting out sufficiane contrast to lock onto and focus quickly. Many shooters use a manual approach to keep from 'waiting' on the lens to do the job itself - pro glass will limit your distance range to speed up the process, but it's no a foolproof solution at all times. My 70-200 VR does quite well in this regard but I'm convinced it's due to the larger aperture mostly.

Mule

It may be due to lack of contrast. I normally go to 7 area wide mode when I shoot birds in flight because of the auto tracking. The background for these shots is normally just a blue/overcast sky. Jeff
[font=Arial][size=1]
Nikon D300
Nikon D200
18-70 Nikkor 3.5-4.5 G
55-200 Nikkor 4-5.6
105 Micro Nikkor 2.8G VR
SB-600 Speedlight
Manfrotto 055MF4 Tripod
Manfrotto 3130 Pan/Tilt Head
AF-S VR Zoom-Nikkor 70-300 f/4.5-5.6 G IF-ED
Nikon D810
Nikkor 24-120 AFS F/4G ED VR

#5 Jon H.

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Posted 02 November 2008 - 06:55 PM

Hey Jeff, Probably preachin' to the choir on this, but I find it helpful in some cases to try to locate an edge or line in the scene to focus on, then focus and recompose. Jon (from my iPhone)
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#6 mule_patterson

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Posted 02 November 2008 - 08:59 PM

That's it - blue sky offers nothing to focus on for sure - contrast isn't the real issue, focus tracking is what matters, huh? If your subjects are all at infinity do you need to focus at all? I guess with a super tele you wouldn't always be at infinity... Mule
Brian "Mule" Patterson
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DSLRs Nikon D300 w/ MB-D10 | Nikon D40
DX Optics 10.5/2.8 DX Fisheye | 16-85/3.5-5.6 VR DX Nikkor
FX Optics 14-24/2.8 Nikkor | 24-120/3.5-5.6 VR Nikkor | 70-200/2.8 VR Nikkor | 85/1.4 Rokinon | 50/1.8 AIS Nikkor | 55/2.8 1:1 Vivitar Macro | Kenko 1.4X TC
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#7 Jeff

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Posted 03 November 2008 - 01:42 AM

That's it - blue sky offers nothing to focus on for sure - contrast isn't the real issue, focus tracking is what matters, huh? If your subjects are all at infinity do you need to focus at all? I guess with a super tele you wouldn't always be at infinity...

Mule

I am trying to focus on the bird though. I keep the focus area on the bird not the sky and it still goes to infinity. The birds could be less than 50-200 feet away not at infinity. Jeff
[font=Arial][size=1]
Nikon D300
Nikon D200
18-70 Nikkor 3.5-4.5 G
55-200 Nikkor 4-5.6
105 Micro Nikkor 2.8G VR
SB-600 Speedlight
Manfrotto 055MF4 Tripod
Manfrotto 3130 Pan/Tilt Head
AF-S VR Zoom-Nikkor 70-300 f/4.5-5.6 G IF-ED
Nikon D810
Nikkor 24-120 AFS F/4G ED VR

#8 mule_patterson

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Posted 03 November 2008 - 06:03 PM

That is clearly a matter of contrast which any camera would struggle with. Apart from the actual AF speed of the D200 body, maximum aperture is a real factor as is the number of focus points - faster with a lower number of points to compute. You might need a faster lens to shoot anything that isn't receiving direct sunlight - I had miserable results with my old 70-300 AF zoom on a D40. Not much of a comparison but the same optical formula as your VR model. Just couldn't respond fast enough to keep up with polo horses. Manual focus may really be a better way with slower optics... Mule
Brian "Mule" Patterson
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www.brianrpatterson.com

DSLRs Nikon D300 w/ MB-D10 | Nikon D40
DX Optics 10.5/2.8 DX Fisheye | 16-85/3.5-5.6 VR DX Nikkor
FX Optics 14-24/2.8 Nikkor | 24-120/3.5-5.6 VR Nikkor | 70-200/2.8 VR Nikkor | 85/1.4 Rokinon | 50/1.8 AIS Nikkor | 55/2.8 1:1 Vivitar Macro | Kenko 1.4X TC
Support Bogen 3221 w/ Markins M20 & RRS B2 LR II| Bogen 681B Monopod/Gtai Ballhead | Induro C014 CF/Gtai Ballhead | Nodal Ninja 180 Pano Head
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#9 Neil Rothschild

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Posted 04 November 2008 - 07:27 AM

Jeff, Do you only have problems with difficult AF targets like birds in flight, or are you having problems with easy targets too, such as static subjects? Neil

#10 Jeff

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Posted 04 November 2008 - 09:28 PM

Jeff,

Do you only have problems with difficult AF targets like birds in flight, or are you having problems with easy targets too, such as static subjects?

Neil

Neil, I havn't tried static subjects alot with it yet. I am gonna go out again tomorrow (weather permitting) and try a few things. Jeff
[font=Arial][size=1]
Nikon D300
Nikon D200
18-70 Nikkor 3.5-4.5 G
55-200 Nikkor 4-5.6
105 Micro Nikkor 2.8G VR
SB-600 Speedlight
Manfrotto 055MF4 Tripod
Manfrotto 3130 Pan/Tilt Head
AF-S VR Zoom-Nikkor 70-300 f/4.5-5.6 G IF-ED
Nikon D810
Nikkor 24-120 AFS F/4G ED VR




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