What is this on the lens glass?

[Asha]

Fujinon lens rear element

There are some marks on the edge as seen in the photo which isn't fungus.

I'm wondering s it the start of seperation.

What do you huys think it could be and is it worth being concerned about?

 

[excalibur2]

h'mm my first thinking is condensation marks...but on the outer edges shouldn't affect your shots and as AAMOI probably wouldn't affect your shots if it was in the centre. And another AAMOI is:- marks on the other (back) end are more serious.

 

[Asha]

h'mm my first thinking is condensation marks...but on the outer edges shouldn't affect your shots and as AAMOI probably wouldn't affect your shots if it was in the centre. And another AAMOI is:- marks on the other (back) end are more serious.

This is the back end ( rear element Bri)
It's a lens that has come up for sale which interests me but I have my concerns!!

 

[excalibur2]

This is the back end ( rear element Bri)
It's a lens that has come up for sale which interests me but I have my concerns!!

Ah well things like this depends are the price you are paying..it's worth sending the seller an email about your concerns and make an offer that you are happy with.
At the bootie there is an old saying "don't pay more than you are prepared to lose" h'mm I suppose it could apply to ebay although you get the protection which helps.

 

[Asha]

Ah well things like this depends are the price you are paying..it's worth sending the seller an email about your concerns and make an offer that you are happy with.
At the bootie there is an old saying "don't pay more than you are prepared to lose" h'mm I suppose it could apply to ebay although you get the protection which helps.

Oh I'm still interested in the lens, just a shame I can't physically view it before hand and there isn't any protection as such as it's a private sale ( not eBay )
Given the marks are on the edge, and the seller states that there is no effect on images is reassuring, however what has caused the marks is what I would like to try find out as if it is something progresive such as seperation then I'll not be making any offer.

 

[excalibur2]

something progresive such as seperation

Well say it was separation AFAI've read it's gradual so one way of looking at it is:- say the lens last 3 years then it still depends on the price in the beginning and what it cost you in lost money to use it in that time.
Stopped well down you'll probably get away at separation starting at the edge.

 

[joxby]

Are you just guessing what marks.....any marks, could be, kinda hypothetical like
because from that picture I have absolutely no idea what marks we are meant to be looking at

 

[FruitFlakes]

Is this a large format lens? Could be the paint used to blacken the edges of each element falling off, Schneider lenses are known for this too.

 

[Asha]

Are you just guessing what marks.....any marks, could be, kinda hypothetical like
because from that picture I have absolutely no idea what marks we are meant to be looking at

Top right of the lens element sort of 1 o'clock to 2 o'clokish

 

[Asha]

Is this a large format lens? Could be the paint used to blacken the edges of each element falling off, Schneider lenses are known for this too.

Yes it is a LF Fujinon 400mm T lens

I have schneider lenses of which at least one has the paint issue that you mention......That causes no big problems.

I wouldn't like to say if this is the same problem or something else

 

[joxby]

Top right of the lens element sort of 1 o'clock to 2 o'clokish

That's not a reflection of light through trees ?....lol

I dunno, terrible picture, I'm just gonna have to go with hypothetical
I've seen a lot of lenses with white flecks in the black anti reflective coatings on the inside of lenses, mebbe its the chemicals separating over time I dunno but generally its not seen as an enormous problem

 

[medwaygreen]

Looks like the start of edge separation to me. If so will only get worse over time.