New to this and saw this in my first lens?

[Dugan]

Is that Rodenstock Sironar, (plain , not -N)?
I had the same issue, and it is de-cementing.

[Moman]

Is that Rodenstock Sironar, (plain , not -N)?
I had the same issue, and it is de-cementing.

It is -N.
Can you tell me a bit about it?

[Dugan]

I bought a "plain" 150mm (?) Sironar in a partially-working shutter at a camera swap meet for $20. The seller was upfront about it, said it was junk. I bought it for the shutter, and threw the elements in the trash after doing some online research about Sironars de-cementing.
It looked like oil in between the elements, with rainbow patterns like yours.
Apparently the -N was a newer version that solved that problem...but not yours, it seems.
Have you tried using it?
If it were me, I'd return it to the seller if possible.

[paulbarden]

The rainbow colors seen in your photo are NOT evidence of separation of lens elements, it is simply how the coatings appear in certain lighting. There is absolutely nothing wrong with your lens.

[Bernice Loui]

Two possible areas of lens element separation.



Remove the front lens cell (un-screw from shutter). Place the lens cell on a light table. Put a polarizer on the camera lens, adjust the polarizer to see if dark areas appear on the lens cell. De-cement aka separation will appear dark like this.




Bernice

[Moman]

Two possible areas of lens element separation.



Remove the front lens cell (un-screw from shutter). Place the lens cell on a light table. Put a polarizer on the camera lens, adjust the polarizer to see if dark areas appear on the lens cell. De-cement aka separation will appear dark like this.




Bernice

Thank you for taking your time to answer.

I think it is actually the aparture blades looking like shades on the original photo. Or not? I dont have any tools really to dismantel a lense.
Regarding the small white dots, are those just dust or?

[Moman]

The rainbow colors seen in your photo are NOT evidence of separation of lens elements, it is simply how the coatings appear in certain lighting. There is absolutely nothing wrong with your lens.

Okay, good to hear. The white stuff is just dust then?

[Bernice Loui]

If this lens is typical, no tools required to remove the lens cells from the shutter (hold the shutter by hand, unscrew the front or rear lens cell with the other hand). They simply un-screw (counter clockwise) from the shutter both front and rear.

To mount this lens to a lens board, the rear element will need to be removed, by unscrewing it from the shutter to access the shutter mounting ring.

Unlike roll film or digital or cine or similar lenses, LF lenses are specifically designed to be easily take-apartable for mounting, service, replacing a shutter and all that.


Bernice

Thank you for taking your time to answer.

I think it is actually the aparture blades looking like shades on the original photo. Or not? I dont have any tools really to dismantel a lense.
Regarding the small white dots, are those just dust or?