Nighttime/moonlight photography

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Andy
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Postby Andy » Mon Sep 21, 2009 8:30 am

GIC: I am glad to hear yet another ringing endorsement of the D300. I am looking forward to the upgrade in the near future.

Your Technical specs perplexed me slightly, in two ways:

1. What is "Tripod Mode"?

2. Why do you have VR on on the lens if you are mounted on a tripod?
Andy

If it sounds too good to be true, its probably . . . .


GIC
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Postby GIC » Mon Sep 21, 2009 2:39 pm

Hope this answers both questions.

Obtained from Nikon USA – Learn and Explore. See link below.
"A feature of select NIKKOR VR (Vibration Reduction) lenses, Tripod Detection Mode automatically reduces vibration due to shutter release when the camera is mounted on a tripod."

http://www.nikonusa.com/Learn-And-Explore/Nikon-Camera-Technology/ftlzi4z8/1/Tripod-Detection-Mode.html

Even though if a camera is mounted on a tripod various types of vibrations can still affect the picture quality. For example; if the camera / tripod are setup on a road side, deck, bridge or parking garage the tripod can still receive vibrations from foot or vehicle traffic movement, which ultimately arrive to the camera. Nikon has a tripod mode as explained above to help prevent vibration.
If a camera mounted on a tripod where no human made vibrations are detected then I could do without the tripod mode and take shots by using traditional methods.

Andy
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Postby Andy » Mon Sep 21, 2009 4:20 pm

Not trying to be argumentative, GIG: Just want to be clear and totally informed :)

I looked at your referenced link and then also did a search on the Nikon site for tripod protection mode. As your quote notes -- and this seems important -- Tripod Detection Mode is technology that is available on select Nikkor lenses. In a search, the 28-200 does not come up as one of those lenses.

Indeed, I had read previously that the early VR lenses did not have "tripod detection mode" and that on a tripod you were supposed to switch it off. I notice that it moves and hunts if I leave it on and use AF. How do you know the 28-200 has Tripod Detection mode? I would really like to confirm this (or not) because it is my workhorse lens.

I also think there is a distinction between "Tripod Mode" and "Tripod Detection Mode." The latter appears to be a built in function of the lens.

The former, "Tripod Mode" appears to be a function of DSLR's which have a "live view" screen (I am thinking the D300 does?). It has to do with how the AF works.
Andy

If it sounds too good to be true, its probably . . . .

GIC
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Postby GIC » Mon Sep 21, 2009 6:43 pm

Good someone is paying attention. I and my counter part miss interpreted what each of us were thinking about Tripod Mode and I posted erroneously.
Best to disregard my previous post.
This TRIPOD MODE has nothing to do with vibration what so ever.

Here is the explanation of TRIPOD MODE. Scroll down webpage until you see "Nikon D300 Live View modes". There you will see the explanation.

http://www.imaging-resource.com/PRODS/D300/D300A3.HTM

Nikon D300 Live View modes

In Live View (Handheld mode) the LCD display echoes the optical viewfinder. You can move the AF point around the screen in Single point or Dynamic AF area modes, but the 51-point AF does not reveal chosen AF points.
The Nikon D300 now features Live View, or the ability to see a live image from the camera's sensor on the LCD. What makes Nikon's Live View mode unique are the two options it provides for autofocus operation. The first Live View (Handheld mode) is the one used by everyone else. Because the traditional AF sensors are blocked when you flip up the mirror for Live View mode, you have to drop the mirror to focus, then flip it back for Live View. There's significant delay in this mode, to be sure, and a blackout for as long as it takes for the D300 to focus.

In Live View (Tripod mode) you can move the AF point around the screen in small increments...

...and use the zoom buttons on the back of the camera to move in up to 10x to focus.
The Nikon D300's second mode is the real charm: Called "Live View (Tripod mode)," this mode uses contrast detect autofocus, driven from the imaging sensor. Instead of flipping mechanical switches, the Nikon D300 simply reads data off the CMOS image sensor and evaluates how abruptly light to dark (or dark to light) transitions happen on the image plane. Contrast-detect AF isn't nearly as fast as phase-detect (which is why the shutter response of most digicams is so much slower than most digital SLRs), but at least these new Nikons can focus without interrupting the Live View display.
As an added benefit, because it's working with data coming from the main image sensor, you can move the AF point anywhere you want within the frame area, right out to the extreme edges. AF operation in this mode is unfortunately quite slow, so they really mean it when they call it Tripod mode. You can use it handheld, but you won't get the best results.
The Nikon D300 also provides up to a 10x zoom in Live View mode, providing excellent focus discrimination when focusing manually. This is pretty important, as less than 10x magnification really doesn't do the trick for getting the focus set right, but at 10x we felt we could pretty well nail the focus every time.
Both the new Nikons and Canons include the ability to control the camera from a computer remotely, and that includes receiving a Live View image from the camera. You can focus, adjust settings, and fire, all from a computer. What's more, you can do it via cable or WiFi connection, with the optional WiFi adapters.
The new Nikons require optional Camera Control Pro software to enable this feature. Software for this feature is bundled with Canon cameras.

Andy
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Postby Andy » Tue Sep 22, 2009 10:27 am

GIC: Thanks for the clarification. I still am wondering, though, if you have information that suggests the the 18-200VR has a "tripod detection mode"? I have been thinking "not" and have tried to remember to switch VR off when mounted. I want to make sure I am taking full advantage of the technology I have :)
Andy

If it sounds too good to be true, its probably . . . .

GIC
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Postby GIC » Fri Sep 25, 2009 9:54 pm

Andy,
The 18-200mm VRII Lens does not have Tripod Detection Mode.
Tripod Detection Mode is found in the high-end lenses, 400, 500, 600 mm etc.
http://www.nikonusa.com/Find-Your-Nikon/ProductDetail.page?pid=2171

Andy
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Postby Andy » Sat Sep 26, 2009 3:13 pm

That was what I thought, but thanks for the confirmation.
Andy

If it sounds too good to be true, its probably . . . .



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