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Where does 'infinity' start in focusing?
Using the Nikon 70-200 mm f 2.8 VR lens and the TC-17e II teleconverter with Nikon D70s body, at approximately what distance (feet, yards, or meters) can the focus be manually set on Infinity? I don't have the teleconverter yet, but am inclined to get one. In some discussions about the teleconverter, concerns about speed of focus has been raised. Thanks. Tom..

Comments (8)

Perhaps the site below has the info you are looking for:.

Http://www.dofmaster.com/dofjs.html.

FINE PRINT: I reserve the right to be wrong. Should you prove me wrong, I reserve the right to change my mind...

Comment #1

P001 wrote:.

Using the Nikon 70-200 mm f 2.8 VR lens and the TC-17e IIteleconverter with Nikon D70s body, at approximately what distance(feet, yards, or meters) can the focus be manually set on Infinity?.

At any distance. Of course the closer your subject is the more out-of-focus it is. There's only one plane of sharpest focus, so if you set he lens to infinity and the subject is 400 feet away, the subject won't be too much out of focus (how much depends on the aperture and focal length), but it won't be sharp, either..

In somediscussions about the teleconverter, concerns about speed of focushas been raised..

It will focus slower. But that's better than focusing fast and missing focus, causing it to hunt. Use the focus limiter, that will help..

Seen in a fortune cookie:Fear is the darkroom where negatives are developed..

Comment #2

Your question is imprecise but I think you're asking about hyperfocal distance and depth of field..

Http://en.wikipedia.org/wiki/Hyperfocal_distance.

Http://en.wikipedia.org/wiki/Depth_of_field..

Comment #3

Mrxdimension wrote:.

Your question is imprecise but I think you're asking about hyperfocaldistance and depth of field..

Http://en.wikipedia.org/wiki/Hyperfocal_distance.

Http://en.wikipedia.org/wiki/Depth_of_field.

Be a torch bearer ...S3 IS.

Thanks for the link.

Focal length (mm)Selected f-stopSubject distance.

Calculate.

Subject distance 3 ft.

Depth of fieldNear limit 2.99 ftFar limit 3.01 ftTotal 0.03 ft.

In front of subject 0.01 ft (50%)Behind subject 0.01 ft (50%).

Hyperfocal distance 622 ftCircle of confusion 0.019 mm.

Why is the hyperfocal distance is far away from the subject distance ???how does this work ????..

Comment #4

A combination of f-stop, focal length and sensor size will give you a hyperfocal distance. If you focus there everything from half that distance to infinity would be in acceptable focus..

So you put a long focal length with a large aperture on a small sensor to get that long hyperfocal distance..

The circle of confusion of 0.019 mm is for dSLR sensors like the ones found in Canon 400D..

For Canon S3 this circle of confusion is smaller (because the sensor is smaller) and it's about 0.005 mm..

The extreme hyperfocal distance for Canon S3 is at 72 mm and f/3.5 and it's of about 985 ft (about 300 m)..

On that site you have the ecuations to calculate the near and far limits as well as the hyperfocal distance and they are more accurate than the online calculator.VictorBucuresti, Romaniahttp://s106.photobucket.com/albums/m268/victor_petcu/http://picasaweb.google.com/teodor.nitica/..

Comment #5

Thanks for the link and explanation ... I am just not sure how to apply in taking pictures ... what is the practical implication in taking pictures ???.

In S3, I just try to auto focus and shoot without wondering about all the hyperfocal distance. I just mind the f stop, shutter speed and ISO..

I do not even know the focal lenght of the camera to be honest. SO, I am lost ? Could I survive without knowing all these numbers before shooting at all like S3 ????.

Thanks.

Baloo_buc wrote:.

A combination of f-stop, focal length and sensor size will give you ahyperfocal distance. If you focus there everything from half thatdistance to infinity would be in acceptable focus.So you put a long focal length with a large aperture on a smallsensor to get that long hyperfocal distance.The circle of confusion of 0.019 mm is for dSLR sensors like the onesfound in Canon 400D.For Canon S3 this circle of confusion is smaller (because the sensoris smaller) and it's about 0.005 mm.The extreme hyperfocal distance for Canon S3 is at 72 mm and f/3.5and it's of about 985 ft (about 300 m).On that site you have the ecuations to calculate the near and farlimits as well as the hyperfocal distance and they are more accuratethan the online calculator.VictorBucuresti, Romaniahttp://s106.photobucket.com/albums/m268/victor_petcu/http://picasaweb.google.com/teodor.nitica/.

Be a torch bearer ...S3 IS..

Comment #6

Baloo_buc wrote:.

A combination of f-stop, focal length and sensor size will give you ahyperfocal distance. If you focus there everything from half thatdistance to infinity would be in acceptable focus..

Actually from half the hyperfocal distance to infinity will be acceptably sharp..

Seen in a fortune cookie:Fear is the darkroom where negatives are developed..

Comment #7

Peacewarrior wrote:.

Thanks for the link and explanation ... I am just not sure how toapply in taking pictures ... what is the practical implication intaking pictures ???.

Shoot at the hyperfocal distance and everything from half the hyperfocal distance to infinity will be acceptably sharp..

Notice I said acceptably. Subjects at the hyperfocal distance will be sharpest, as that is the plane of sharpest focus. As you move away from the plane of sharpest focus, objects become less sharp (i.e. more blurry). If you get outside the limit of acceptable sharpest, in other words outside the depth of field (which is subjective what may be sharp enough for you might not be for somebody else), objects get too blurry..

In S3, I just try to auto focus and shoot without wondering about allthe hyperfocal distance. I just mind the f stop, shutter speed andISO..

That's because the sensor is so small that the depth of field is huge..

Could I survive without knowing all these numbers beforeshooting at all like S3 ????.

If you want to zone focus, which is what you were asking, then yes..

Seen in a fortune cookie:Fear is the darkroom where negatives are developed..

Comment #8

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