Actually, with its small cast and completely isolated setting, I first thought Tethered was set after some kind of catastrophe and that Solomon’s mother was suffering radiation poisoning. And that the unseen creature was some sort of mutation. But if the setting is post-apocalyptic it’s never mentioned.

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A Fresnel lantern (pronounced frəˈnɛl or fruh-nel) is a common lantern used in theatre that employs a Fresnel lens to wash light over an area of the stage. The lens produces a wider, soft-edged beam than a spotlight or key light, and is commonly used for back light and top light.

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While the focus can alter the size of the beam, the distinctive scatter of light that the Fresnel lens emits also requires a way of controlling its shape. Since Fresnels cannot use internal shutters, such as those found in an ellipsoidal spotlight, they are often fitted with distinctive barn doors to control the spill and shape the beam of light. These are large metal flaps that may be mounted just beyond the color slot at the front of the lantern. They are colloquially known as "Harris Flaps" in the United Kingdom theatre industry.[3] [4]

Theatrical Fresnel lanterns are typically made in three-, six-, or eight-inch lens diameters, with lamps ranging in power from 150 W to 2,000 W. The three-inch variety is referred to as an inkie. Fresnel lenses can be placed close to the light source and are inexpensive to produce.

It’s not until a hunter named Hank (Kareem Ferguson; Talking with the Taxman About Poetry, Something Blue) stumbles across Solomon that things pick up a bit. But that doesn’t mean things suddenly become exciting. Tethered is much more of a two-character drama and really is to horror films what the similar two-hander A Knight’s Tour was to post-apocalyptic science fiction.

A young boy named Solomon (Brody Bett) who we quickly realize is blind and tethered to the cabin he lives in, checks animal traps with a long stick as his mother Nidia (Alexandra Paul; Christine, Baywatch) looks on. Back home she oversees his efforts to gut and clean a squirrel caught in one of them.

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We do get some atmospheric sequences once Hank first goes out looking for the creature, but the film still focuses as much on Solomon and his inner turmoil over whether or not to disobey the rule to never let go of the rope and help Hank track the beast. It feels almost as though it’s a metaphor for growing up and becoming one’s own person, even if it means rejecting, or letting go of what we were raised to believe.

The distinctive lens used in a Fresnel lantern is named after its inventor, Augustin-Jean Fresnel, who developed it for use in lighthouses. It has a 'stepped' appearance instead of the 'full' or 'smooth' face of other lenses. This allows the lens to focus the light by tilting each successive ring of glass slightly more steeply as its distance increases from the center. If the glass were completely flat, this would cause a corresponding pattern of circles of light, so Fresnel lenses are usually stippled on the flat side. This pattern of small bumps helps to break up the light passing through the lens and gives Fresnels their characteristic soft beam. This means that the intensity of the light is consistent across the spread of the beam of light, as opposed to being less intense around the edges as in an ellipsoidal reflector spotlight (ERS).

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The first half-hour of Tethered is very slow-paced, especially after Nidia exits. Apart from a few clever moments such as Solomon fishing with a bell tied to the pole to tell him if he has a bite or the device he uses to split firewood the proceedings verge on dull. A couple of POV shots from in the trees or an odd noise in the distance hint at the presence of someone or something but it’s not enough to lift the film from its doldrums.

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Unfortunately, we also get an ending that leaves a lot of questions unanswered and goes from effective to ludicrous in a literal blink of an eye. It almost feels like they were running out of time and money so they just threw something together at the last moment. With seven writers there’s no reason for so many questions to be left unanswered or for nobody to have realized how bad the final shot would look.

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Because the reflector of a Fresnel lantern cannot be larger than its lens aperture, the lamps are not very efficient: only the light emitted straight forward or backward (and redirected forward by the reflector) is utilized, with the rest absorbed by the casing as waste heat.

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Stars: Brody Bett, Alexandra Paul, Jared Laufree, Kareem Ferguson, Chris Demm | Written by Jeff Cox, Daniel Robinette, Michael Scott, Aaron Sorgius, Kayla Stuhr, Jeremy Tassone, Cooper Thornton | Directed by Daniel Robinette

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Still, for something shot on what appears to be an almost non-existent budget and with a mostly inexperienced cast, Tethered is a surprisingly well-done film. Just expect something that’s a very slow burn and more of a drama-thriller than a monster movie.

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Years later the now grown Solomon (Jared Laufree) lives alone, his mother having vanished with no explanation. He lives alone, but still follows the three rules she drilled into his head. To always give back to the forest which provides for him, when his will is almost gone, find comfort in their song, and, most importantly, never, ever let go of the rope.

The degree to which the lamp may be focused is limited by the length of the housing. To reduce the width of the beam, the lamp and reflector are moved further back from the lens (spot focus). However, the farther back in the housing the lamp is placed, the more light is wasted in the housing.[2]

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Fresnels use a spherical reflector, with the filament of the lamp at its focus point. This effectively doubles the light delivered by the fixture, as all that is emitted backwards into the reflector is reflected back out the front. As with most lighting fixtures, the lamp and reflector cannot move independently, and are moved together as a unit to focus the beam. This is done by a slider on the bottom of the lantern, or a worm track and crank in the back of the unit. The lamps work best with their bases facing up, with bulb life shortened significantly when mounted upside down.

Director Daniel Robinette, who is one of an astonishing seven credited writers, based Tethered on his 2017 short of the same name which also featured Laufree as Solomon. He gives us very few clues as to what’s going on. A recording made by the boy’s father Lucas (Chris Demm; Hank vs. The Undead) says that he has to leave for unspecified reasons and that Nidia is sick and moving out here hasn’t helped her like they hoped it would. What her illness is or why moving to the middle of nowhere would help we don’t know.

In the theater and dance world, Fresnels are most often used for top or backlighting, at medium throw distances. In small venues, they are occasionally used for front light, although the relative lack of control, when compared to an ellipsoidal, is a major disadvantage. The distinctive soft beam of a fresnel can make it very useful as a special in certain situations.

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