• 2" Filter Slot, w/light blocking ring, Item FSAT: $149 - THEY'RE BACK!
• 2-inch Threaded Long Barrel Adapter, Item A2LT: $49
• Zero Profile T-Adapter, Item AZP2T: $39
• 2-inch Threaded Short Barrel Adapter, Item A2ST: $39
• 2.156-inch Threaded Short Barrel Adapter, Item A2156: $59
• 2"-24tpi Female to 42mm T-Thread Male Adapter, Item A2T: $59
• 42mm T Female to 2"-24tpi  Male Threaded Adapter, Item AT2: $59
• 2-inch to 1.25-inch Reducer, Item AR21: $29
• 2" SCT Captive Retaining Adapter, Item AHEX: $69
• 2-inch to 2-inch Drawtube, Item AD22: $49
• 2-inch to 1.25-inch Drawtube, Item AD21: $39
• 1.25-inch to 1.25-inch Drawtube, Item AD11: $39
• 2" Parfocalizing Collar Ring, Item CLR2: $17.50
• 1.25" Parfocalizing Collar Ring, Item CLR1: $12.50
• Basic 35mm Camera Package for VP Slider 1, Item CPB: $79
• Advanced 35mm Camera Package for VP Slider 2, Item CPA: $109

VSI's Exclusive Adapters

These Adapters & Couplings will Convert your Imaging Train into any Conceivable Configuration

Use your Imagination to Create the Ultimate Imaging System

See Money $aving 35mm Camera Packages at the Bottom of this Web Page

VSI Adapters, Couplers, Drawtubes & Collar Rings

2"Threaded 2" Filter Slot Adapter (FSA). The 2-inch threaded FSA takes standard 2-inch (48 to 50mm) filters up to a thickness of  5/16" (0.3125"). The FSA is designed to take industry standard double sided, male/female threaded filters. The same type filter cell that screws onto the bottom of a 2" eyepiece, except instead of screwing them on, you just pop them in and out.  Easy, fast and no dust contaminants from constantly removing and installing filters, etc. The threaded FSA adds slightly less than 1-inch to your profile. If you discount the threads, it only ads about a half-inch. Even though this adapter is cut in half, there is no flexure from heavy, leveraged equipment loads. VSI guarantees zero flexure up to 10 lbs. The internal adapter walls are 1/4-inch thick aluminum, eliminating any possibility of flexure. Also included with your FSA is a stray light blocking insertion ring (pictured). When you're not using your filters, just insert the ring to block stray light from entering the slot.

The threaded FSA has a standard 2"-24tpi male thread on one end, and a standard 2"-24tpi female thread on the other end (not shown in picture). This adapter's diameter and threads are the same as the visual back on Meade/Celestron Schmidt-Cassegrain telescopes (male 2" diameter, 24 threads per inch). This threaded FSA has the same physical dimensions and thread specifications as a standard Meade/Celestron focal reducer, except this adapter has a filter slot in the center of the housing, instead of a glass lens. This FSA is the same type as the built-in filter slot on the rear imaging port of the VP Sliders, and includes the stray light blocking insert ring noted above.

NOTE: For all of you who wanted one of these exclusive and unique Filter Slot Adapters and were disappointed, I just completed a short run and they are now in stock after being sold-out for almost a year. For others who might be interested in these "one-of-a-kind" adapters for the first time, don't what too long because a limited production run will not last long. - PVS

• Item FSAT, 2" Threaded Filter Slot Adapter, w/stray-light blocking insert ring: $149 - They're Back & In-Stock!

2-inch Threaded Long Barrel Adapter: This adapter is a standard 2"-24tpi male thread to 2-inch standard barrel-nose slide format. Screw this adapter into the front female 2"-24tpi threaded slip-ring (input port) on the Sliders to convert your Slider to 2" barrel nose format for use with MasterGlide focusers or any other standard 2-inch focuser. This 2"-24tpi threaded barrel adapter also has a machined safety indent for your thumb screws, which prevents the barrel from slipping out of the focuser's tube even if the thumb screws come loose. The threads on this adapter duplicate the diameter and male threads on all standard SCT visual backs, such as Celestron/Meade Schmidt-Cassegrain telescopes.

• Item A2LT: $49

Zero Profile T-Adapter: This zero profile T-adapter (ZPTA) is designed to fit, with a zero profile, in the 2-inch rear imaging port of all Sliders. It has the industry-standard metric 42mm - 0.75mm thread pitch. Note the circular dovetail [flange] machined into to housing. This 15 degree dovetail not only provides a safety catch for your thumb screws, but also presses the ZPTA into the Sliders rear port for a zero flexure fit. If you are doing CCD camera work, use your CCD camera's basic female T-thread input and screw the ZPTA directly into your CCD camera head. Then slip it in the Slider's rear imaging port and lock it down with the double thumb screws. If you are doing 35mm camera work, just screw your T-ring on to the ZPTA, connect your 35mm camera to your T-ring. Then slip it in the Slider's rear imaging port and lock it down with the double thumb screws. If you are just doing CCD camera imaging, this is the only adapter you need. Included in packages below.

• Item AZP2T: $39

2-inch Threaded Short Barrel Adapter: This adapter has a standard 2"-24tpi male slide format (0.75 inches long) designed to fit in the 2-inch rear imaging port of Sliders. Then you can screw your 2-inch focal reducer, or any accessory that has a standard 2"-24tpi female threaded coupling, into the threaded end of this adapter. Note the circular dovetail [flange] machined into to housing. This 15 degree dovetail not only provides a safety catch for your thumb screws, but also presses the A2ST into the Sliders rear port for a zero flexure fit. Also, inserted in the Slider's rear imaging port, this adapter has the same zero profile as the ZPTA listed above.

• Item A2ST: $39

2.156-inch Threaded Short Barrel Adapter: This adapter is designed for the 2-inch rear imaging port of the Slider, converting that port to SBIG's 2.156"-24tpi proprietary format. Although this thread is also the same as the popularized SBIG STL11000, this adapter is not to be used with that specific large-chip CCD camera. SBIG has two other CCD cameras that utilize the same housing/thread as the STL11000 but have a smaller chip that is compatable with the internal 1.75" clear aperture of the Slider. This adapter should only be used with SBIG's smaller CCD chip cameras like the 4020 and 6303 models. Using the STL11000 with a Slider will cause serious vignetting. If you want to use your STL11000 with a VSI optical manifold, you need to see VSI's Sidewinder, which is designed for [much] larger than 2-inch format components. Note the circular dovetail [flange] machined into to housing. This 15 degree dovetail not only provides a safety catch for your thumb screws, but also presses the A2156 into the Sliders rear port for a zero flexure fit.

• Item A2156: $59

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2"-24tpi Female to 42mm T Male Threaded Adapter: This adapter has a standard 2"-24tpi female thread input, just like your Meade/Celestron focal reducers, etc., and the output is a standard male 42mm-0.75mm male T-thread that will attach to any CCD camera or 35mm camera's T-ring adapter. One of many uses for this adapter is to install a focal reducer into the rear port of a Slider by inserting VSI's A2ST (above) in the rear port of the Slider, then screwing on a fairly fast focal reducer (like the Meade f/3.3 FR). At this point you have a 2"-24tpi male threaded output on the rear of your FR that will not screw onto your CCD camera's female T-thread input, so this is where this adapter comes into play. Screw the A2T onto the rear of your FR and simply screw your camera of choice onto the A2T. Using this faster FR configuration, you will need to extend out the top and side ports of the Slider to achieve parfocus. This is just one use for the A2T. I'm sure you can think of many others.

• Item A2T: $59

2"-24tpi Male to 42mm T Female Threaded Adapter: This very unique accessory  is approx. 0.75" long and has female T-threads on one end and male 2"-24tpi threads on the other end. You can screw this adapter onto the front [slip-ring] port of a Slider to convert it's input to female 42mm-0.75mm T-threads allowing you to attach a standard Meade/Celestron T-Adapter for eyepiece projection, or any other accessory that has male T-threads, etc. This special adapter can serve many other purposes, too.

• Item AT2: $59

2-inch to 1.25-inch Reducer: This industry standard reducer has a 0.375-inch profile and reduces your 2" format focuser to 1.25" so you can utilize 1.25" barrel eyepieces and accessoriesnoses. This reducer also has a circular dovetail cut into the outside 2" diameter to provide better security. When locked down with double thumb screws, it is impossible for this adapter to fall out. The thumb screws pushing against this circular dovetail also provide lateral pressure creating a very solid connection.

• Item AR21: $29

2" SCT Captive Retaining Adapter: has industry-standard 2"-24tpi female threads (adapter bottom, not shown), double thumb screws at the top for standard barrel indents, and our proprietary double thumb screws below for locking into the special groove on the barrel of our Hexagonals (see Hexagonals link for additional info). This adapter can also be used to convert 2"-24tpi SCT visual backs to accept 2" format barrel nose eyepieces, etc. The extra set of locking thumb screws can be used for additional [Quad-Lock] security when inserting conventional eyepieces and accessories, or not used at all.

• Item AHEX: $69

Slider Drawtubes

A=2-inch to 2-inch Drawtube: Drawtube A is for use with 2-inch format eyepieces and accessories, and is for use in the top slide-mirror port only. When drawtube A is inserted in the top slide-mirror port, you're able to achieve parfocus with 35mm cameras attached to the rear imaging port. Drawtube A can then be extended to achieve parfocus with your 35mm camera and a 2" format wide field "finder" eyepiece. Drawtube A is necessary if you want your 2-inch eyepieces to parfocus with your 35mm camera attached to the rear imaging port. Note 1: If you have a fixed position that you continually use, you might want to purchase a set of Parfocalizing Collar Rings or, although less accurate, scribe or mark lines around your drawtubes for future quick setups. Example: changing from CCD to 35mm camera setups.

• Item AD22: $49

B=2-inch to 1.25-inch Drawtube: If you're not going to use 2-inch eyepieces, then drawtube B is the ideal drawtube to use, and is included in the following money saving accessory packages. Basically, drawtube B is the same as drawtube A above, except drawtube B is for 1.25-inch eyepieces. Note 1 above applies. Material is fully machined from Vinyl Polymer rod stock. Note 2: If you will be using 2-inch format eyepieces in the top slide-mirror port, you can substitute 2-inch to 1.25-inch drawtube B for 2-inch to 2-inch drawtube A in the Accessory Packages below. Included in packages below.

• Item AD21: $39

C=1.25-inch to 1.25-inch Drawtube: Drawtube C is needed to extend your side pick-off port to achieve parfocus with guiding eyepiece or guiding CCD camera when using a deep focusing 35mm camera in the rear imaging port. It is not necessary for shallow focusing CCD camera work. Fits all Slider 2s with 1.25-inch format side ports. Drawtube C can also be used in the top slide-mirror port in conjunction with 2" to 1.25" drawtubes or reducers. Note 3: Drawtube C could also be used in conjunction with reducer E (below) as a drawtube extension system, out the top slide-mirror port instead of drawtube A or B above, etc. etc, Note 1 above applies. Included in packages below.

• Item AD11: $39

Slider Eyepiece & Camera Parfocusing Collar Rings

These unique, and exclusive, collar rings are necessary to lock-in a repeatable eyepiece and camera parfocusing position. Just slip the collar over your eyepiece or camera tube, and lock down the thumb screw at the parfocus point. From then on, even when you change your setup, your eyepiece or camera will reinsert at the exact parfocus point, with repeatable zero tolerance. No need to waste your valuable time to reparfocus your entire system. Since the collar rings are 0.25 to 0.3 inches thick, you will need at least that amount of clearance between the eyepiece housing and the top of the female port to utilize these Collar rings. If you don't have this minimum clearance, you can move your CCD camera (with a 1.25" nose) out from the rear imaging port a small amount. Then refocus your camera, and you will have enough eyepiece clearance to utilize these collar rings. Another usable parfocusing method, although with very little repeatable accuracy, would be to just scribe or mark the eyepiece tubes at the parfocus point with a fine tipped, permanent ink, black marker.

• ITEM CLR2 2" Collar Ring (above left): $17.50
• ITEM CLR1 1.25" Collar Ring (above right): $12.50

The Following 35mm Accessory Packages $ave Money

BASIC 35mm Camera Package for Slider 1: Includes accessories for 35mm camera imaging with the Slider 1. Includes the following: Your choice of 2" to 1.25" Drawtube (AD21) or 2" to 2" Drawtube (AD22), Zero Profile T-Adapter (AZP2T).

• Item CPB Package: $79

ADVANCED 35mm Camera Package for Slider 2: Includes accessories for 35mm camera imaging with the Slider 2. Includes the following: Your choice of 2" to 1.25" Drawtube (AD21) or 2" to 2" Drawtube (AD22), 1.25" to 1.25" Drawtube (AD11), Zero profile T-Adapter (AZP2T).

• Item CPA Package: $109