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Telescope Types and the Best Binotron-27 Super System for Them

 Newtonians and Other Scope Types

The Binotron-27 Super System ($1099.00) with Upgraded OCS A45 ($149.00) is the ideal choice for all Newtonians.  

This system is really the only choice if you intend to use a Newtonian. This system also works on Refractors and SCTs and many other related telescope designs. 

The OCS (Optical Corrector System) leads the way into your focuser and intercepts the converging light cone of the telescope first. This light cone is the widest at that point of interception as it travels to, and through the binoviewer to the eyepieces. The OCS is necessary in order to produce focus. One may get away with not upgrading the OCS A37 to the A45 if the Newtonian is slower than F/5.  What is the difference between the A37 and A45? The OCS A37 has a 37mm clear aperture. The OCS A45 has a 45mm clear aperture and is the largest optic we could fit within a two inch holding cell.

The Binotron-27 Super System allows a single pair of eyepieces to experience a 1.3X/2.3X/3X magnification factor whether one used the A37 or the A45. The A45 will bring in peripheral rays that would otherwise be lost with the A37. 

Options include The Filter Switch ($249.00), The Collitron Reticle ($139.00), our highly acclaimed D21 and D14 Conventional Eyepieces, and the new L-O-A 21 3D Eyepieces available through

Buy any Binotron -27 Super System and get a $150.00 discount on the 3D Eyepieces!


Refractors Only

The Binotron 27 Super System (1099.00) will operate with your own 2" Star Diagonal and allow your refractor to focus at three magnification factors. The included OCS A37 is fine for using with most refractors because the converging rays are not so steep since focal ratios are typically slower than F5. Refractor telescopes in general MUST have the OCS threaded to the telescope-side of the star diagonal in order to allow the Binotron to reach focus. There are some advantages to using our own Denkmeier 2" Quartz Mirror IVB Star Diagonal (we provide more details under that product description). However, any 2" Star Diagonal threaded for 48mm filters on the telescope side (virtually all modern 2" Diagonals are threaded) will allow the Binotron to function at three magnification factors with no problems reaching focus. If you also plan on using this system with a Newtonian, we recommend upgrading the OCS A37 to the OCS A45 ($149.00) for the upgrade at time of purchase). And yes, this system works with SCTs as well. 

Schmitt Cassegrain Telescopes (SCT's)

1.The Binotron 27 SCT Super System (1399.00) includes everything that the Binotron 27 Super System does but in addition, the IVB 2" Star Diagonal is also included. The dovetail system is included also. This allows the Binotron to be "docked" to the diagonal body after the 2" Star diagonal eyepiece holder is removed. This configuration can come in handy if your SCT has less back focus ability. Dovetailing lessens focus demand when in reduction .66x mode. For most SCTs, this system allows 66x/1.15x/2x  magnification factors. This system also includes everything needed for refractor use including the 2" Star Diagonal. Yes, this system also works with Newtonians though adding the option for the upgraded OCS A45 is highly recommended.

2. The S2 Power Switch Star Diagonal and The Binotron 27 Ala Carte  is also a very good option for SCT users. The positive side of this is that since the large 37mm clear aperture lenses of the S2 Power Switch are in fact ON the S2 Diagonal and not the  Binotron, even 2" Single Eyepieces can be used in S2 for Reduction/Normal/Barlow magnification changes. A limitation is that a Newtonian Telescope cannot reach focus without a Power Switch and OCS being on the Binotron 27. The Binotron Ala Carte connects to the S2 Power Switch Diagonal and will not focus in a Newtonian.The S2/Binotron Ala Carte is strictly for SCT users. Note that the S2 and Binotron 27 Ala Carte can be used with a refractor if the OCS A45 Option is added to the S2. Many SCT users choose the  S2 and The Binotron 27 ALa Carte because the S2 can also be used to allow Power Switching for single eyepieces, especially 2" widefield eyepieces. The magnification factors are basically .66x/1x/2x. These are approximate values.

Solar Scopes

Lunt Solar Scopes: All of the above except for the Binotron Ala Carte and S2 will work for the Lunt 60mm and above

Hydrogen Alpha Scopes. However, you must add our Denkmeier Optical Adapter for Lunt Scopes ($249.00 option). See this product under Lenses for more specific details.

 Binotron 27 for The Quark from Daystar: We like the Binotron 27/Quark combination so much that we and Daystar are working together on a bundle package! See the Bundle Package under Shop for more details. The Binotron 27 used with The Quark has a dual arm power switch just like it does for the Super System. This allows three magnfication factors when used with The Quark. There is no OCS Cell included with this version since it is not used with The Quark. The Quark has an internal 4x transfer lens but The Binotron 27 Power Switch low power lens allows full disc views with our Denkmeier 32mm Plossls.  Included in the Binotron 27 for The Quark  is The Binotron 27 and a pair of our new Denkmeier 32mm plossls. The Quark Solar Filter from DayStar is additional.