Canon LTM Canon 7 eyepiece diopter

Canon M39 M39 screw mount bodies/lenses
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pagpow

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Hi,

I'm slowly equipping my RFs with diopter correction lenses and it's great. Unless I'm overlooking something the Canon 7 has neither built in nor provision for add-on.

Has anyone modified the eyepiece to take a Leica or Epson diopter? like sticking a threaded ring on the eyepiece ring?
 
For the Canon P, they made three replacement eyepeice assemblies with different diopters.

The Canon 7 repair manual available online doesn't have a detailed parts list, so I don't know if they did the same there. Of course, you can't order that part from Canon anymore.

So have an optician measure the diopter of the eyepeice, and have a new one made with the right change in the diopter. Of course, you may need to have a new ring machined, unless you want to smash out the existing lens (ow).
 
Eyepiece removal ?

Eyepiece removal ?

Hi all,
Sorry to resurrect an old thread, but, i am looking at buying a Canon P or a Canon 7, and will need to get the eyepiece corrected.
I have seen that the eyepiece on the P is plastic and held with a small screw, but cant tell from the parts diagram how the eyepiece comes off the 7. Does anyone know if it's a screw in part ?
If it also comes off my optician could make a correcting lens for me.
Many thanks in advance,
Geoff
 
geoffdragon said:
OK, maybe the question was too hard.
Does the eyepiece on the 7 unscrew ?
Thanks in advance,
Geoff
Click to expand...

Yes it does ! At least on the 2 Canons 7 that i have.

Personally i need an eye piece correction of +1 while the standard eyepiece gives actually a minus correction. So i am better of with the eyepiece unscrewed :)

Alas unable to find genuine diopter correction eyepieces for this camera :bang:
 
Seeing is believing, so here an image of the removed Eye piece :

15232659412_c5881a13a5_c.jpg

http://www.flickr.com/photos/29504544@N08/15232659412/

I measured the thread diameter, about 16mm.
The lens diameter is about 13mm
 
Did yours readily screw off? Or did you have to use some sort of tool to turn the eyepiece ring? Mine won't budge, no matter how hard I turn it.

Jim B.
 
What tolerance does "about 16mm" have? The regular eyepiece diameter used on Canon SLRs that did not use a square eyepiece is 17mm. Could this be the same size?
 
Mackinaw said:
Did yours readily screw off? Or did you have to use some sort of tool to turn the eyepiece ring? Mine won't budge, no matter how hard I turn it.

Jim B.
Click to expand...

I actually managed to unscrew it using a piece of rubber between it and my fingers.
There are no slits or holes so normal lens tools cannot be used.
 
sevo said:
What tolerance does "about 16mm" have? The regular eyepiece diameter used on Canon SLRs that did not use a square eyepiece is 17mm. Could this be the same size?
Click to expand...
A rough measurement with a caliper.
Sadly I do not have a Canon SLR with a round eyepiece.
Could correction diopters be had for those ?
 
hanskerensky said:
A rough measurement with a caliper.
Sadly I do not have a Canon SLR with a round eyepiece.
Could correction diopters be had for those ?
Click to expand...

For the original F-1, yes. I have several. They measure about 17 - 18mm in diameter (a quick estimate with a ruler).

Jim B.
 
sevo said:
What tolerance does "about 16mm" have? The regular eyepiece diameter used on Canon SLRs that did not use a square eyepiece is 17mm. Could this be the same size?
Click to expand...

Just did some more precise measurements.

Thread of the Eye piece between beaks of the Caliper : Diameter 16,4 mm
Outside of Eye piece between beaks of the Caliper : Diameter 18,9 mm

Hope that somebody can give us those diameters of a F1 SLR Eye-piece.
 
I just measured two correction eyepieces for the original canon F-1 plus the glassless original ring using dial calipers. The threads on the glassless ring and the +1 eyepiece both measured 19.8mm. The 0 diopter eyepiece measured 19.0mm. Even the 19.8mm eyepieces had a little play in the threads.
 
Spavinaw said:
I just measured two correction eyepieces for the original canon F-1 plus the glassless original ring using dial calipers. The threads on the glassless ring and the +1 eyepiece both measured 19.8mm. The 0 diopter eyepiece measured 19.0mm. Even the 19.8mm eyepieces had a little play in the threads.
Click to expand...

Thanks for that information !
So an eyepiece for the F-1 clearly will not fit on the Canon 7. Pity.

I myself tried already the good available eyepiece of a Nikon FM SLR.
Unfortunately that is also too big :-(
 
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