Luminous Landscape Forum

Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: Phil A on June 27, 2007, 12:40:30 pm

Title: Nodal point of 24-105 f4 canon lens?
Post by: Phil A on June 27, 2007, 12:40:30 pm

Hi,

I'm trying to find the nodal for the 24-105 canon lens @ 24mm and 35mm.

I assume that it would be quoted from the film/sensor plane !

Any help would be great.

Thanks.

Phil.

Title: Nodal point of 24-105 f4 canon lens?
Post by: adiallo on June 27, 2007, 01:07:17 pm

It's easy enough to test this but you do need a nodal slide or other rail on which to slide the camera forward and backwards while remaining level. Set up on a tripod and place two objects in the scene, one at close range, the other near infinity. Pan the camera on the tripod left to right and adjust the fore-aft position of the camera body (via the nodal slide) until the rear object stops shifting position relative to the close object. When they remain aligned while panning, you've found the nodal point.

Title: Nodal point of 24-105 f4 canon lens?
Post by: Phil A on June 27, 2007, 01:43:35 pm

Like most of these things " simple when you know how!!

Thanks very much.


Phil.

Title: Nodal point of 24-105 f4 canon lens?
Post by: Andy Barnes on June 27, 2007, 01:48:32 pm

Hi Phil

In addition to Amadou Diallo's advice, those helpful people over at panoguide.com have a useful tutorial (http://www.panoguide.com/howto/panoramas/panohead.jsp) that will help you to find the nodal point of your lens.

Andy

Title: Nodal point of 24-105 f4 canon lens?
Post by: Phil A on June 27, 2007, 04:25:29 pm

Hi Andy,

Thanks for that, very useful. Sorry for the delay getting back to you,
I was out shooting a panorama, it chucked it down of course!!!!

Cheers.

Phil.

Title: Nodal point of 24-105 f4 canon lens?
Post by: Wayne Fox on June 27, 2007, 05:02:03 pm

Quote

Hi,

I'm trying to find the nodal for the 24-105 canon lens @ 24mm and 35mm.

I assume that it would be quoted from the film/sensor plane !

Any help would be great.

Thanks.

Phil.
[a href=\"index.php?act=findpost&pid=125185\"][{POST_SNAPBACK}][/a]

Wouldn't the nodal point be dependent on the current zoom of the lens?  I was under the impression that the nodal point of a zoom lens varies as you change focal lengths.

Title: Nodal point of 24-105 f4 canon lens?
Post by: adiallo on June 27, 2007, 08:31:42 pm

Quote

Wouldn't the nodal point be dependent on the current zoom of the lens?
[a href=\"index.php?act=findpost&pid=125250\"][{POST_SNAPBACK}][/a]

Yes that's exactly right. Phil would need to run the test for each focal length he intends to use. I use primes so I forgot to add that important point   .

Title: Nodal point of 24-105 f4 canon lens?
Post by: wmchauncey on June 27, 2007, 09:51:20 pm

Quote

Hi Andy,

Thanks for that, very useful. Sorry for the delay getting back to you,
I was out shooting a panorama, it chucked it down of course!!!!

Cheers.

Phil.
[a href=\"index.php?act=findpost&pid=125240\"][{POST_SNAPBACK}][/a]

Just for my curiosity, why did you chuck the panorama.  I find them useful for croping into a decent size print.

Title: Nodal point of 24-105 f4 canon lens?
Post by: Jeremy Roussak on June 28, 2007, 03:56:24 am

Quote

Just for my curiosity, why did you chuck the panorama.  I find them useful for croping into a decent size print.
[a href=\"index.php?act=findpost&pid=125315\"][{POST_SNAPBACK}][/a]

The phrase, "chucked it down" means "rained very heavily". At least in England it does.

Jeremy

Title: Nodal point of 24-105 f4 canon lens?
Post by: Phil A on June 28, 2007, 03:53:26 pm

I did some test and found the nodal points at 24mm & 35mm and
as expected they are different. Thanks all.