Tele Vue Paracorr User Manual

UNIVERSAL PARACORR INSTRUCTIONS

BACKGROUND

All Newtonian/Dobsonian telescopes can benefit from using a Tele Vue Paracorr (Parabola
Corrector) to eliminate coma in the image. Coma is the effect that makes off-center stars appear
like little comets (it becomes more apparent as stars move closer to the edge of the field). Any
Newtonian/Dobsonian telescope will benefit from the use of Paracorr, but those from f/3.5 to f/5.0
will see the greatest results. For example, the size of the diffraction-limited field expands by an incredible
36 times in area for an f/4.5 mirror! Paracorr essentially makes an f/4 scope perform like an f/8. Just
insert it into your 2" focuser like a 2" Barlow (it has a 15% [1.15x] magnification factor) and add Tele Vue Imaging System
components to suit your needs. It’s a recipe for perfection, when you use Tele Vue eyepieces.

This model Paracorr (PLU-1106) has the largest possible lens aperture to minimize any vignetting.

PHOTOGRAPHIC USE

The key to obtaining proper coma cor­rection is to space the lens surface 55mm
(±4mm) from the film plane or CCD chip.
Since the Universal Paracorr is designed
to use the spacers and adapters from
Tele Vue's Imaging System, any combi­nation of spacer and camera attach­ment can be used in order to obtain the
proper lens to focal plane distance. For
example, using an SLR or DSLR with a T-ring
attached, you will simply need to add the
TRG-1072 Imaging System T-Ring adapter
to the Universal Paracorr.

When using CCD cameras, you
will need to know the distance of the
CCD chip to the surface of the camera.
Subtract that figure from the required
55mm to get the remaining necessary
spacing length.

CAUTION:

It is important to keep
in mind that the con­vex lens surface (near­est to the camera) rises
above the Universal
Paracorr's metal work.
Always place the unit
down on the 2" diam­eter barrel to avoid
damage to the lens.

Lens surface rises above
the metalwork

Thread Tele Vue Imaging System
Components onto the Universal
Paracorr (PLU-1106) to match your
camera connections as well as ob­tain the necessary 55mm spacing
between the Paracorr and the fo­cal plane. Accessories shown are
the T-ring Adapter (TRG-1072) and

0.250", 0.375", 0.500" and

1.000" spacers.

Te l e V u e

Visionary

32 Elkay Dr., Chester, New York 10918 (845) 469 - 4551 www.televue.com