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Forums - Modelling / Painting |
The painting forum is for the discussion of techniques on the painting, decalling and weathering phases of AFV modelling and the tools and materials used. |
| Topics | 1365 |
| Messages | 6917 |
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| Subject: | Re: Warrior periscopes |  |
| Date: | Oct 19, 2002 |
| From: | Paul Roberts | |
You have to be careful which periscopes are painted which colours. Plain
optical periscopes need only gloss black. It's where a lens coating has
been used that you get the metallic rainbow type reflections. I think
that there are two primary compositions used to coat periscopes and
sights, Gallium Arsenide and either Zinc Sulphide or Zinc Selenide
(could definitely be wrong on the names). Each material has different
properties. Some TI sights are not transparent in the visual spectrum
and these have a metallic Gallium lens. They are transparent in the IR
frequencies and that is why they are used. One of these materials gives
the pink/purple reflection and the other gives the green/blue
reflection. Unfortunately, both look almost black from dead ahead.
Indeed, the same vehicle can have both materials, depending on what
sensors are fitted and what radiation the coatings are designed to
either transmit or filter out. Modern visual light periscopes have to be
opaque to targeting lasers and yet as transparent as possible to visual
light. IR sights have to be transparent to IR radiation over narrow
transmission bands and new, combined sights, must do all of this at the
same time.
It pays to have pictures of these periscopes and sights from several
different angles to see which colours you are supposed to be reproducing.
--
Paul Roberts
tankmodeler@rogers.com
Scale Tech Distributing
Scale Model Builders
http://members.rogers.com/tankmodeler/ |
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