Tele Vue Paracorr Visual User Manual
Tele vue, Visual paracorr instructions, 2" eyepiece/adapter lock screws (a)
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! Stars at the edge of the field will improve so dramatically, that (using top-notch Tele Vue eyepieces) the image will look
the same anywhere in the field. It also prevents faint stars from disappearing at the edge of the eyepiece field. This is not only
aesthetically pleasing, but it also greatly reduces the need to constantly nudge the scope to keep the object centered in the “sweet
spot.” 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 eyepieces to suit your needs. It’s a recipe for perfection, when you use
Tele Vue eyepieces.
This model Paracorr has the largest lenses possible to prevent any vignetting, even when using the 31mm Nagler Type
5. The tunable top permits positioning all Tele Vue eyepieces for optimum performance (see eyepiece
position chart below).
INSTALLATION
Paracorr simply slips into your focuser like a 2" Barlow. Depending on eyepiece type and setting, you
will need just 3/8" to 3/4" focuser in-travel compared to using the eyepiece alone.
USE
For 2" Eyepieces:
1) Make sure eyepiece lock screws (A) are loosened
2) Slip 2" eyepiece into the Paracorr
3) Tighten eyepiece lock screws (A)
4) To adjust for eyepiece position,
a.Slightly loosen the height adjustment lock knob (B) that clamps on the slot.
b. Rotate the outer barrel to adjust the height of the eyepiece, following the guidelines
in the eyepiece position chart below.
c. Tighten the height adjustment lock knob (B).
For 1¼" Eyepieces:
1) Slip the 2" to 1¼" reducing adapter into the Tunable Top and tighten lock screws (A).
2) Place the eyepiece in the adapter and tighten the lock screw (C)
3) Follow the adjustment procedures outlined above in step 4.
NOTE
: Focus the telescope after properly setting the eyepiece position. Do not accidentally use the
tuning feature for focussing.
The easiest method for finding optimal correc-
tion for other brand eyepieces is to first establish the
focus position with a Tele Vue eyepiece at its known
Paracorr setting. Then insert your other eyepiece and
use the tunable top until focus has been reached.
Note the mark on the Paracorr body for the setting.
Use your telescope focuser to tweak the focus if
necessary.
CAUTION
: Avoid using 1¼" Barlows unless you are
certain the barrel will not contact the Paracorr lens.
However, you can use the 1¼" Powermates
safely in the 1¼" adapter. Place 2" Powermates in the
focuser and the Paracorr into the 2" Powermate.
32 Elkay Dr., Chester, New York 10918 (845) 469 - 4551 www.televue.com
Tele Vue
V i s i o n a r y
VISUAL PARACORR INSTRUCTIONS
2" Eyepiece/Adapter
Lock Screws (A)
Note: Guide Screws shown have
been replaced by stainless steel but-
ton head screws with tension preset
during assembly. No need to adjust.
Tunable Top
Lock Knob (B)
(A)
1 2
3
4
5
(A)
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