Nokton 40mm frameline modification

[cosmonaut]

Has anyone here modified there 40mm Nokton to bring up the 35mm framelines on an M6? I have a link to someone on Flickr that has done it and it seems simple enough. It not a big deal with it as is, but I find the 35mm framlines more accurate than the 50mm.

[doubice]

The lens’ bayonet lug, which activates the frame selector, has to be filed back a smidgeon. The 35mm lens setting is the ‘default’ setting of the frame selector system, where the selector does not move at all.

I did this by filing small sections of the lug at a time, until the frame selector did not activate the 50mm setting. Care has to be taken so that no filings end up in the helical mount or the lens’ internals……

FYI – the lug that activates the frame selector is the one at 9 o’clock, with the lens in horizontal orientation and the bayonet facing you. It is the on the other side of the lens lock detent.


Good luck,


Jan

[veraikon]

Here is a link with an illustrated description (en francais) of the modification:

summilux.net :: Voir le sujet - Modification Nokton 40mm 1,4

[cosmonaut]

Thanks for the advise. I may give it a go.

[doubice]

Another hint - in the pictured modification, the lug was filed at an angle. I did mine by filing to shorten the lug; this is how all Leica mounts are set up. The longest lug is the one for the 28/90mm frame pair, 50mm is mid-length and 35mm the shortest.

Best,

Jan

Hello!
You might use an engraver`s tool, like a "Dremel" or any other similar type of micro-high-speed-drill with a small tool bit.

#DREMEL ONLINE SHOP

you have better control,-
good luck Wolfhard

[doubice]

Yes, a Dremel would be the tool of choice. Since we all need more than one hobby to stay sane in this world , I also dabble into model trains and have a few Dremel tools at the ready. It was a Dremel with a cut-off dic that I used.

Best,

Jan

[bill]

Can I be the dissenting voice here?

Why do it?

35mm - Angle of view approx. 64 degrees
40mm - Angle of view approx. 57 degrees
50mm - Angle of view approx. 45 degrees

So a nominal 7 degrees difference between 40 and 35, and a nominal 8 degrees difference between 40 and 50.

Personally, I use this lens for street and occasional low light shots. I would rather have a bit more on the negative than a bit less. I shoot it as a "generous" 50mm as a result.

Regards,

Bill

[howard_cummer]

I have ground off the frame selector of my Nokton 40 SC to bring up the 35mm frame on my M8 and to my eye, the 35 frame on the M8 approximates more closely the field of view of the 40mm than the 35mm that it is designed for. Just my view, of course.

[doubice]

Originally Posted by howard_cummer

I have ground off the frame selector of my Nokton 40 SC to bring up the 35mm frame on my M8 and to my eye, the 35 frame on the M8 approximates more closely the field of view of the 40mm than the 35mm that it is designed for. Just my view, of course.

Given the inaccuracy of the M8's frames, this is true. A 40mm lens is more at home with the M8's 35mm frame. I use a Canon RF 25mm lens, coded and on a 24/35mm adapter - surprisingly (or not.....), it just about matches the 24mm frame.

Best,

Jan

[bill]

Howard, Jan, I understand that with the M8, but the OP referred to an M6. That's why I don't understand.

Regards,

Bill

[cosmonaut]

It seems the 35mm framelines are more accurate and are about 100% fill. It's not a big problem to pull the lever over while shooting. I am sure in time I will get really comfortable with it. I just thoght if it was an easy DIY I would give it a go. Now. What's the worse that can happen if I fail?

Hello !
Worst case? Filings could be caught in focusing thread!
best regs Wolfhard

Originally Posted by bill

................

35mm - Angle of view approx. 64 degrees
40mm - Angle of view approx. 57 degrees
50mm - Angle of view approx. 45 degrees

So a nominal 7 degrees difference between 40 and 35, and a nominal 8 degrees difference between 40 and 50.
........................


Bill

Hi Bill, from 57 to 64 ,- 7 difference, from 45 to 57 it seems to be closer to 12!
Just my humble opinion,
so theres some sense in it for me,
best regards Wolfhard

[bill]

Originally Posted by findwolfhard

Hi Bill, from 57 to 64 ,- 7 difference, from 45 to 57 it seems to be closer to 12!
Just my humble opinion,
so theres some sense in it for me,
best regards Wolfhard

*stands in corner*

Well spotted Wolfhard!

Regards,

Bill

Originally Posted by bill

*stands in corner*

Well spotted Wolfhard!

Regards,

Bill

Hi Bill, what would you expect from a bloody teacher?
Best regards
Wolf

[bill]

Originally Posted by findwolfhard

Hi Bill, what would you expect from a bloody teacher?
Best regards
Wolf

ROTFL!

But Sir...

I did my homework, see...?

Focal length and angle of view.jpg

Slide1.JPG

Slide2.jpg

Slide5.jpg

Can I go out and play now?
Regards,

Bill

Bill,- you may for this time only! But make sure you are back home at five!
Wolfhard Gradgrind