L900C

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iconoclastica
Posts: 148
Joined: Sun Jan 20, 2019 5:43 pm

L900C

#1 Post by iconoclastica » Sun Nov 20, 2022 9:03 pm

With my Nikon optiphot epi-illuminator, I got a filter marked "L900C" in a box labeled "MBN12400". It looks like it's a diffuser only. What is it used for?

Sure Squintsalot
Posts: 133
Joined: Mon May 16, 2022 3:44 pm

Re: L900C

#2 Post by Sure Squintsalot » Sun Nov 20, 2022 11:15 pm

Looks like the 900c diffuser filter slips into the base lamp housing with two additional slots made to receive it, a neutral density filter, and an 80B blue filter. Of course, you could slot that filter anywhere you need to diffuse a point light source. MBN12400 is probably the manufacturer's part number:
Screenshot 2022-11-20 162736.jpg
Screenshot 2022-11-20 162736.jpg (77.29 KiB) Viewed 302 times

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iconoclastica
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Re: L900C

#3 Post by iconoclastica » Mon Nov 21, 2022 3:51 pm

I use other filters of the same make and I do know where they go. Notwithstanding that, I appreciate your reply, for the text included in the picture. At the bottom left it says "LEMON SKIN", which is a new term to search for:
Nikon lemon skin filter wrote:Use of the lemon skin filter is effective for low magnification photography
https://patents.google.com/patent/US20050226556 wrote:A typical lemon skin filter is an assembly of convex lenses with random, different and small focal distances. To reduce cost in practical applications, plate glasses are frosted by rough grinding and chemically etched to reduce scattering. This treatment gives the surface the appearance of lemon skin. The product is therefore not an assembly of convex lenses with uniform small focal distances (a micro-lens array) but a random, nonperiodic structure consisting of convex and concave lenses of random focal distances.
Motic BA410 series manual wrote:The second disc is a minimum diffusion lemon skin filter that is used to eliminate the haze and inference colours caused by the high uniformity of the first filter.
Apparently it is used for photography and diffuses, but still I wonder what is its application.

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