Does the front of the M 35/2 rotate when focusing?

[rayn]

This question is about the Leica M 35mm f/2 Aspheric Lens. I'd like to know if the front rotates when focusing. I want to try using a polarizer with it. I know about the Leica universal polarizer, but it seems too expensive at the moment.

 

<p>

 

Thanks!

[ralph_barker]

No, Ray, it does not rotate, so alternative polarizer solutions should

not be a problem in that respect.

[rayn]

Thanks, Ralph. I'll need a circular polarizer (not linear) with the

M7, correct?

[roger_michel]

circular polarizer is not needed or recommended. best to use either

the leica swing out polarizer or one of the heliopan or b+w polarizer

that have the marked rings (you set the angle by eye, note the number

on top, put polarizer on camera, and rotate so same number is on

top). circular polarizer is for the af crowd.

[rayn]

ok, I wasn't sure about this. I thought the circular polarizers were

more for TTL meters than autofocus. The M7 uses a TTL meter so I

thought a circular polarizer would be needed.

[doug_landrum]

A circular polarizer is needed to maintain correct light intensity to

light meters that read off of a mirror. The meters in Leica Rs (R4

to R7, I assume but do not know) read light reflected from mirrors.

A mirror also polarizes light. Two linear polarizations of light can

be opaque creating a false meter reading. The meter in the M6 reads

off of a white spot on the first shutter curtin directly without a

mirror.

[budc]

Leitz brought out the circular polarizer with the introduction of the

Leicaflex SL. The problem occurs when the light passes THROUGH the

mirror on it's way to the photocell at the bottom of the camera.

This light is repolarized and would effect the meter accuracy. Use

of a circular polarizer prevents the repolarization of light.

Circular polarizers are required for ALL Leica SLR's dating from the

SL.

 

<p>

 

You can use either type of polarizer with Leica M's.

[steve_barnett2]

Roger Michel wrote

"circular polarizer is not needed or recommended. best to use either

the leica swing out polarizer or one of the heliopan or b+w

polarizer that have the marked rings (you set the angle by eye, note

the number on top, put polarizer on camera, and rotate so same

number is on top). circular polarizer is for the af crowd"

 

<p>

 

I always thought the Leica swing out filter was a cicular polarizer?

Have I been wrong all these years?

[stefan www.randlkofer.co]

sorry if i bore anyone, but i still like my cheapo polarizer solution

for any rangefinder:<p>

<img src="http://www.photo.net/photodb/image-display?

photo_id=560999&size=md">

[richie chishty]

Stefan:

 

<p>

 

I must have missed your earlier posting on the Leica M polarizer

solution. What exactly did you do and how?

[budc]

Both versions of the swing-out polarizers are linear. Circular

polarizers are not needed since the there is nothing in the light

path in either the M5 or the M6/7 that alters the effect of the

polarizer before it reaches the photocell.