M lenses viewer, does any one know?

[roberto_watson_garc_a]

Recobering from a bad back, with three days in bed,I wanted to see the halos of my 35/1.4 non-asph (wide open), the only way I found was placeing the leica M lens on a nikon fm body, I could see those halos; in a very out of focus, but those were there, presence of flare could be seen in other lenses, halos only in the 35´lux.

 

<p>

 

Does any one know if I can find a tube with a M mount and a fresnel glass at the same distance than film on a M body? a leica M lens viwer...

 

<p>

 

do they exist?

 

<p>

 

so my question.

[al_henry4]

Take the bottom off your Leica M. Hold a piece of tracing paper or

fresnal glass an the rails. Set the shutter to B press and hold the

shutter release. WAH LAH!

[al_henry4]

Forgot for prolong use leave the rear door up put the bottom back on

and get a locking type of shetter release. You can even mount the

camera to a tripod. This set up allows you to check the accaracr of

your range finder and the depth of field of any lense at any F stop

by simply using a tape measure and three targets. Place one at a set

distance from the film plane focus. Then place the other targets one

in front and one behind the focused target move them until they reach

the break point where they begin to go soft. Have fun. OH don't try

this at infinity how fer can you walk?

[jackflesher]

Actually, there are "viewers" available. I don't know what they're

called, but I saw two of them on eBay a few months ago. It was

listed as "Leica M lens viewer" (!)

 

<p>

 

:-),

[roberto_watson_garc_a]

thank´s, I´ll look in ebay to see if I find one, Jack.

 

<p>

 

Alfred, thank´s for help, I have already done that, but is not so

comfortable for moveing around, and yes infinity can be very far.good

to know you got my idea.

[carlin]

I've took a broken piece of 4x5

ground glass and had it cut into

strips by a framing shop so that

it fit between the film guide

rails of the M. I put a little bit

of tape on two ends to keep from

scratching the film gate and

protect my fingers from the

sharp edges, and it works like a

charm, and a little more

accurate than tracing paper

(although that was my trial

run). One of the best ways to

check what's happening at the

film plane...

[carlin]

Forgot to add, I usually get a

locking cable release and set

the shutter to Bulb. You can

take the whole back door off,

and you've got yourself a

viewer. Just remember to put

the matte side toward the lens,

because this will effect your

distances. You can check

rangefinder accuracy here, as

well. Pull your eye back from

the viewfinder and you can

compare when you find the

right spot! Not to be taken

lightly, as you can damage your

shutter this way, but I've been

doing this for quite a while and

haven't broken a single piece of

glass and never a shutter

problem...

[jackflesher]

FWIW, you can also "aerial" focus an image through a loupe without

any type of imaging surface like tracing paper or groundglass to

focus on. This technique is often used in critical situations to

focus a view camera. You do need something at the plane of focus --

like a piece of fine wire or strip of scotch tape -- for your eye to

focus on, then the "aerial" image will appear in your loupe.

 

<p>

 

:-),

[roberto_watson_garc_a]

Ok there are lots of ways to see a proyected image on or off a

Fresnel glass.

 

<p>

 

My reason of a M lens viewer is to analize in a moment, without the

need of slides or prints, how a lens can handle side ligths, or in

frame ligth sources, or just to see if a shade hood realy helps or

not, things that can be judged on a ground screen, without the need

of enlargements.

 

<p>

 

A solid thing where you can mount a lens and see can be my dream for

this week, and if I can add something I would like a larger screen so

to see the all proyection area of a lens, with a 24x36 frame marked.

 

<p>

 

I thougth there was already such a tool.