Help identify front lens problem? (1 Viewer)

[Northman]

Trying a binocular, but there is something on the front lens.

What do you think it could be?

Its two round dots close together and a long thin mark. Cant see if its scratched.

Tried with a fine dry rag to clean of, but no change. So not oil. Thought it might be objective cover to close and rubbing against coating?

 

[etudiant]

Pending some comment from one of the experts, my take is that this is cosmetic.
It may well be a scratch or a flaw, but it is not going to affect the view.
Even a large blemish on the oculars gets merged out of the final image.
Bill Cook once noted that you can demonstrate that yourself.
Have a friend stick a dime sized Post-it on one ocular without you knowing when and look through the glass.
You'll have a hard time trying to decide whether the view is clear or obstructed.

 

[Foss]

Wondering if that's internal or external. You might try an up-close examination with flashlight and magnifying glass, shining the light and shifting your viewing angles this way and that. Even shine the light through the eyepiece. Also, very very gently trace your fingertip across the lens to see if there's a difference in texture.

 

[Maljunulo]

I though this is on the objective.

Here we go again ……. am I confused?

 

[MiddleRiver]

Pending some comment from one of the experts, my take is that this is cosmetic.
It may well be a scratch or a flaw, but it is not going to affect the view.
Even a large blemish on the oculars gets merged out of the final image.
Bill Cook once noted that you can demonstrate that yourself.
Have a friend stick a dime sized Post-it on one ocular without you knowing when and look through the glass.
You'll have a hard time trying to decide whether the view is clear or obstructed.

Quite true that it might not make a diff. But the flaw looks huuuuge to me and if 'evaluating' a bin, I'd be looking elsewhere. That said, I'm unclear whether this is a prospective purchase or what?

 

[Binastro]

It seems to be out of focus.

B.

 

[etudiant]

I though this is on the objective.

Here we go again ……. am I confused?

Not you, just me, I wrote 'oculars' when I should have written 'objectives'.
Thanks for catching this goof.

 

[Tringa45]

A "dry rag" is not a good idea.
Several effective methods described here: Safe and effective cleaning fluids for greasy smudges on glass surfaces