Catadioptric

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Front surface mirror applications from Adamer Specialglass. Effective and inexpensive solutions for reflecting or redirecting visible range radiation.

Another benefit of the mirror lens is its short barrel. This is achieved by causing the image forming rays to double back on themselves. This is possible as the main or objective mirror lens is placed at the rear of the tube. The objective mirror’s shape causes the rays to converge. These travel to the front of the tube where they encounter a smaller secondary first surface mirror. This secondary mirror directs the rays to the back of the tube. These image forming exit the tube via a hole drilled in the center of the primary mirror. The rays exit and an image is projected on film or digital sensor.

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For the example you have a Body Armor with 1 Prefix, +129 to Maximum Life, and 3 Suffixes. The goal is to add a Veiled Prefix mod without losing any of the current mods already on the item.

An ideal unveil would be (9-10)% increased maximum Life, (9-10)% increased maximum Mana or (30-35)% chance to Avoid Elemental Ailments, (30-35)% chance to Avoid being Stunned depending on your build's needs.

In order for a mod to be unveiled, it must be taken to Jun. Once unlocked through Jun, Veiled Modifiers can be added to gear via the Crafting Bench (though it will be a lesser version of the non-benchcrafted variant).

Dobsonian telescope

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Chromatic aberration

Craft Suffixes Cannot be Changed to protect the Suffixes. There is no way to guarantee the T1 Life is not deleted by the Veiled Orb, but there's a 50% chance the Metamod gets removed instead.

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Pretty much what it says on the tin. As far as I can tell, catadioptric telephoto lenses (operating on a similar principle to many telescopes; using mirrors rather than refraction) fell out of favour after the 1980s because of their fixed focal length and aperture. Now, fixed focal length I understand, but what are the engineering issues that prevent a variable aperture on a cato lens?

Fresnellens

A Veiled Orb adds a Veiled Mod. The Orb removes a single modifier at random before adding a Veiled mod. Veiled Orbs are acquired as a drop from the Mastermind encounter from Betrayal.

Veiled Mods are item modifiers unique to the Betrayal league mechanic. Items with Veiled Modifiers can be dropped by Betrayal encounters or added to items with Betrayal-specific crafting (e.g. a Veiled Orb).

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In Path of Exile, Veiled Crafting refers to crafts which use a Veiled Orb to add Veiled Modifiers to items. These are both apart of the Betrayal League mechanic. This guide assumes you understand the basics of The Immortal Syndicate.

Concavemirror

The mirror lens has an advantage in that it is completely free from chromatic aberrations. All other lens systems are degraded by longitudinal and transverse chromatic aberrations. These are brought about as the image forming rays pass through a transparent lens. The mirror lens avoids this because the mirror’s silvering is on the surface of the lens; thus the image forming rays never enter. Thus the mirror lens is able to deliver a well-defined image with high magnification.

The key to the folded (shortened) optical path is the up-front second mirror. The problem is, this secondary mirror blocks a significant amount of light that would have entered if the systems were a conventional transparent lens design. The shadow of this obstructing secondary mirror will image if the lens is stopped down to the smaller f/numbers (tiny diameter). Additionally the obstructing secondary makes it almost impossible to install a mechanical iris diaphragm. We are forced to control exposure via shutter speed or ISO setting or both.

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If you're lucky, the Veiled Orb removes the Suffixes Cannot be Changed then adds a Veiled mod in its place. Since you already have 3 Suffixes, a Prefix is added. If there were only 2 Suffixes, it would be a 50% chance for either.

Cassegrain telescope

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Before unveiling, it's important to block the highest-weight veiled modifier(s) that you don't want. For a Body Armor like this you'd craft (8-9)% Chance to Block Attack Damage.

This is a catadioptic system that features a shortened barrel free of chromatic aberrations. The system is however not free from the remaining six aberrations that plague all optical systems. The catadioptic system features a thin transparent lens at the tubes entrance. This lens is used to make some corrections that mitigate some of the aberrations. Thus this corrector lens allows for a simpler shape (figure) of the objective mirror.

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