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Mesmerizing coating Projector lens ???
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PostPosted: Sat Nov 07, 2020 6:28 pm    Post subject: Mesmerizing coating Projector lens ??? Reply with quote
Hello,

Im trying to figure out an lens i have. The only distinct odety/characteristic i can describe is that it has a very unusual coating.

Here are some pics of the lens and coating. ( red is tape to fix it to the helicod )






karel

Small test



Thanks


PostPosted: Sat Nov 07, 2020 7:08 pm    Post subject: Reply with quote
Cool! Could it be a tv projection lens perhaps? They should come in a set of three with different colors.


PostPosted: Sun Nov 08, 2020 2:19 am    Post subject: Reply with quote
Looks like it has infrared coatings.


PostPosted: Sun Nov 08, 2020 8:31 am    Post subject: Reply with quote
blotafton wrote:
Cool! Could it be a tv projection lens perhaps? They should come in a set of three with different colors.


Hmm, you might be onto something here... Thanks! A lead ^^


calvin83 wrote:
Looks like it has infrared coatings.


Is there a way to tell ?
What application are they used for ?

Thanks you!


PostPosted: Mon Nov 09, 2020 10:27 am    Post subject: Reply with quote
Can we see it unmounted? There seems to be a lot of red internally, I'm trying to figure out if it's the red tape or the lens it's self.
The front coating looks magenta to me.
I don't think it's IR pass coated, they are usually quite dark.
What focal length do you think it is?


PostPosted: Mon Nov 09, 2020 11:44 am    Post subject: Reply with quote
Yes. It could be the red tap that made it look red internally.


PostPosted: Mon Nov 09, 2020 12:42 pm    Post subject: Reply with quote
Lightshow wrote:
Can we see it unmounted? There seems to be a lot of red internally, I'm trying to figure out if it's the red tape or the lens it's self.
The front coating looks magenta to me.
I don't think it's IR pass coated, they are usually quite dark.
What focal length do you think it is?


Hi Lightshow

Its not under warm ledlight ( the other pictures were )

But this is how it looks unmounted.

Edit: It's about a 220-240MM F 5.6

#1


#2


#3


#4


Last edited by KarelDH on Mon Nov 09, 2020 4:00 pm; edited 1 time in total


PostPosted: Mon Nov 09, 2020 3:57 pm    Post subject: Reply with quote
If you look through it, which color has it then?


PostPosted: Mon Nov 09, 2020 4:04 pm    Post subject: Reply with quote
kds315* wrote:
If you look through it, which color has it then?


If i look straight at it its deep yellow with a Bleu hue reflection


PostPosted: Mon Nov 16, 2020 8:58 am    Post subject: Reply with quote
kds315* wrote:
If you look through it, which color has it then?

He posed a shot in the first post just above the cat, it definitely has an amber tint.


Thanks for posting the pic with it unmounted,the coating does resemble the filters used to block IR for cameras that have no IR blocking filter. Like the Leica M8.
https://www.35mmc.com/14/02/2016/leica-m8-infrared-cut-filter-comparison/


PostPosted: Mon Nov 16, 2020 9:21 am    Post subject: Re: Mesmerizing coating Projector lens ??? Reply with quote
KarelDH wrote:
Hello,

Im trying to figure out an lens i have. The only distinct odety/characteristic i can describe is that it has a very unusual coating.

Here are some pics of the lens and coating. ( red is tape to fix it to the helicod )


karel



Thanks


If the uneven yellowing is being created by Thorium containing element(s), it can be removed by sunlight, or for speed, L.E.D's.
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