P filter for 400mm telyt

[sfage]

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Anyone know if this will work?

 

52mm Slip-in Circular Polarizing Filter C-PL3L from Nikon

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[sc_rufctr]

No reason why it shouldn't.

[sfage]

I was asking about the dimensions of it. Will it actually slide in to the space where the filter goes?

[naturephoto1]

I was asking about the dimensions of it. Will it actually slide in to the space where the filter goes?

 

I do not know if that will fit.

 

However, the Leica part is 13370 for the Series 7 Circular Polarizer that fits both the 400mm and 560mm f6.8 Telyt lenses.

 

There are several on ebay right now for a reasonable price (and some not so reasonable):

 

leica 13370 | eBay

 

Rich

[algrove]

Does the yellow dot face toward the subject when using this filter? Or is it only for reference?

[naturephoto1]

Does the yellow dot face toward the subject when using this filter? Or is it only for reference?

 

By convention, writing around filters are from top to bottom as you would read them when a lens is placed on it mount. I believe the yellow dot faces the photographer as a reference so that the photographer can see that the filter has been inserted and additionally could be used to monitor the amount of rotation if lifted out of the filter slot.

 

Rich

[robsteve]

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Does the yellow dot face toward the subject when using this filter? Or is it only for reference?

 

That is a good question. On a normal lens you would have it facing out so the dot can be seen. Not sure about in a filter drawer. I wouls suspect it is still facing out as theses series VII filters were originally intended to mount on the front of the smaller lenses using the retaining ring.

 

The yellow dot or the manufacturer's logo is typically a reference point for orienting the filter to get polarization of the sky. You orient it towards the sun in order to get polorization when you cannot look through the filter. In other words, if the sun is in the upper right corner of the frame, position the filter at the ten or two o'clock position depending on whether you are looking at the reference dot facing the lens (two o'clock) or from behind the lens (ten o'clock).

[masjah]

If it's a circular polarising filter, then which way round is indeed significant. As I understand it, a circular polariser may be thought of as a conventional polariser behind which is some sort of re-scattering device so that SLR metering (involving half silvered mirros etc.) still works OK. So you would need to put it the same way round as on a normal lens.

 

You can experiment with two circular poplarisers to verify this. Blacking out by "crossing" only owrks if the two actual polarising layers (that is the two fronts) are adjacent.

[naturephoto1]

If it's a circular polarising filter, then which way round is indeed significant. As I understand it, a circular polariser may be thought of as a conventional polariser behind which is some sort of re-scattering device so that SLR metering (involving half silvered mirros etc.) still works OK. So you would need to put it the same way round as on a normal lens.

 

You can experiment with two circular poplarisers to verify this. Blacking out by "crossing" only owrks if the two actual polarising layers (that is the two fronts) are adjacent.

 

OK, I played with both my Leica 13370 Series 7 Circular Polarizer and my Leica 60mm Circular Polarizer together. This is what I found:

 

As I used the Series 7 circular polarizer nearest me and with the yellow dot facing the subject and the 60mm circular polarizer in the normal orientation the extinction of the 2 polarizers shifted toward magenta. I observed the same affect when the 60mm circular polarizer was nearest me when in the reversed orientation and when the yellow dot of the Series 7 circular polarizer was facing the subject.

 

When the Series 7 circular polarizer was nearest me with the yellow dot facing me and the 60mm circular polarizer in the the reversed orientation I obtained almost complete extinction. The same was the case when the 60mm circular polarizer was nearest me in the normal orientation and the Series 7 circular polarizer had the yellow dot facing the subject.

 

With these results I am not positive which way the Series 7 circular polarizer should face, but maybe it should be with the yellow dot facing the subject.

 

Rich

[masjah]

Rich, what I would suggest is as follows. Take the normal 60mm circular polariser with the front facing away from you. In front of this put the Series 7 polariser. Try it both ways round in front of the 60mm, and see which way round gives the most complete extinction. with the most complete extinction, the face of the Series 7 polariser which is next to the 60mm front face is the face which should go to the front, that is, towards the subject.

 

I've just done the same experiment with two circular polarisers that I have, a 60mm and a 67 mm. I only get complete extinction when the twio "fronts" (the sides meant to be facing the subject) are up against each other. Other ways round gives little or no change on rotation

 

From what you say it sounds as if the side with the yellow dot should face away from the subject, towards the camera.

[naturephoto1]

Rich, what I would suggest is as follows. Take the normal 60mm circular polariser with the front facing away from you. In front of this put the Series 7 polariser. Try it both ways round in front of the 60mm, and see which way round gives the most complete extinction. with the most complete extinction, the face of the Series 7 polariser which is next to the 60mm front face is the face which should go to the front, that is, towards the subject.

 

I've just done the same experiment with two circular polarisers that I have, a 60mm and a 67 mm. I only get complete extinction when the twio "fronts" (the sides meant to be facing the subject) are up against each other. Other ways round gives little or no change on rotation

 

From what you say it sounds as if the side with the yellow dot should face away from the subject, towards the camera.

 

John,

 

Thank you. I repeated the experiment with the 60mm circular polarizer nearest me in the normal orientation (front away from me) and the series 7 circular polarizer with the yellow dot facing the subject to obtain near complete extinction. So, based upon your findings that the 2 polarizers need to have their fronts facing one another to reach complete extinction the yellow dot should face the camera/photographer and the front of the filter is the other side. This also agrees with my initial understanding for this filter that the yellow dot should face the photographer in aiding the filter orientation when from behind the camera of such a long lens (you would not normally use a follow focus 560mm lens from the front of the camera). This would also agree with the normal convention that writing around filters are from top to bottom as you would read them when a lens is placed on its mount.

 

Rich

[masjah]

Sorted!