Fed 2/50 lens: a coated one???

Hello,

Yesterday, I received one of the last 2/50 produced, as far as I know: the serial # 32649 (to put on my 180xxx S eBerdsk).
I was surprised by the first lens which shows blue/lilac reflects which don't exist on my six other 2/50 Fed lenses, as if this one was single coated.

My question of course, is: is it possible? When?

If yes, it would be important for the understanding of Fed S 1e-s periods of making, as there is a strong correlation between S bodies and 2/50 lenses...

Amitiйs. Jacques.

I didn't coated it... I swear... perhaps it came because it was hidden in my collection of T lenses ;-)

seriously I never remarked that... and it came on my FED S number 107723 but someone has mixed the lenses

Note that for me that lens was unusable, because it's out of focus in the all range...

Good luck at finding wat is wrong...

Wat if it was not a fed lens ?

Stephan

Hi all (and Stephan!)

No doubt this is a Fed lens!

I checked its optical possibilities: it is completely out on the complete range, as Stephan says. It's easy to compare roughly two identical lenses. This one was certainly dismantled to be repaired, and the different optic groups of lenses were badly re-mounted.

All that doesn't explain the apparent coated lens... To my mind, it's the point which could be interesting. And the specialized books don't give any explanation.

Amitiйs. Jacques.

Hi Jacques,

Maybe when it was dismantled and reassembled, the front element or element group was replaced with a coated element or group. Maybe that is why it was dismantled ... because the front element was damaged.

I have a FED-S Berdsk # 179348 and it has the original lens # 29484. The lens is not coated.

Bill

Regards, Bill

Hello,

I have just partially dismantled that lens and compared it with another 2/50 lens I own: the n° 27957.

The two rear units are identical: same aspect, same convergence.
It's not the case of the front part. The 32649 is globally much more convergent. The very front lens seems more curved and thicker (I took it away), so that the ring cannot be screwed completely in the barrel to fix this lens. It's this first unit which is coated.

Of course, impossible to take pictures with this lens mounted on a Fed S or any LTM. Perhaps the work of a handyman to sell its lens? Or a trial of the factory for an hypothetic 39mm small format in 1941 or after WW2...?

Amitiйs . Jacques.

Hi!
Sorry for this serial film!

As the ring cannot be completely screwed to secure the very first lens, there are two millimeters which protrude. And the screwing aluminium cover is exactly 2 millimeters larger than the ordinary one to enclose all that. The work is perfect. I try to join a picture.

So that is hardly noticeable that the lens 32649 is very slightly larger than the 27957.

All that makes me think this lens was made by the factory. But when? And above all , why?
If you have ideas...

Amitiйs. Jacques.
Bill, you say your "couple" 179348/29484 is original. Interesting! Do you have a passport or something?

Well, here are the two lenses I speak of.
Jacques.

It has worked!
So, one picture more which shows the faint coating of the left lens and the convergence of its very first lens (the diaphragms are wide open on the two!!).

Jacques.

Hi Jacques,
No, unfortunately I don't have a passport. I think it is original because I bought it here in the United States from a Russian man who was not a dealer, and he told me that it had been his father's only camera and bought near WWII. So this is why I think it.
Yes, my lens has the thinner ring on the front like your uncoated example. It does seem that your coated lens has a thicker ring and must have been made by the factory.

I don't know why this was done or what camera it could fit on, unless the lens was made to fit onto a reflex housing device that would be mounted to the FED rangefinder (sort of like the FS-2 fotosniper from WWII).

Also, I have noticed that the only other serial number as high as your lens, on our WIKI list of FED-S cameras, is the last one on the list, which is a little higher, and is owned by Claudio Asquini and he calls it a "Sonnar"! So maybe this is clue?

Regards, Bill

Thanks, Bill.

I'll try to have this lens optically analysed after the holidays.
Why not this lens for a fotosniper effectively: the dates and the history of Fed would fit.

For Claudio Asquini's lens:
http://www.geocities.com/RodeoDrive/8595/chilavist.html
It seems a real Sonnar with the mounting of a Fed lens...
This camera is dated from 1948. Surprising!

Amitiйs. Jacques.

It seems a real Sonnar with the mounting of a Fed lens...
This camera is dated from 1948. Surprising!

Amitiйs. Jacques.

------------------------------------------------------------

A Sonnar (Zeiss) lens formula will never fit in such barrel !
This is a Real SUMMAR (Leitz) formula lens.

Regards
LP

Hello Luiz,

You mean that Asquini's lens would be a Summar reingraved Sonnar with a Fed mount?

Jacques.

no it's a collapsible sonnar head on a fed 50/2 barrel, "easy" modification



Stephan

It's what I think, too.
And the number gives 1941 as the date of making: not bad for an 1e...

Jacques.

Jacques
Repeating Stephan words........."a collapsible sonnar head on a FED 50/2 barrel"..........
LP

Hi Luiz,
I don't see any difference with what I said...
Probably my english!

Jacques.

Jacques

Could you see if it creates an image, and how far from the flange... ?

Stephan

Hi Stephan,

Yes, there is an image which occurs at about 12/13 mm from the interior part of the flange.
I cannot be more precise for the moment.

Amitiйs. Jacques.

that's bizarre...

bizarre, j'ai dit bizarre... comme c'est йtrange

Stephan

With exactly the same method, I obtain an ordinary c.29mm with another 2/50 mm Fed lens.
Perhaps a specialist in optic could tell us more

Amitiйs. Jacques.

may be you should try to put the front lens the other way... reverse it...

Stephan