This compact Takahashi refractor optical tube makes an ideal eclipse
scope and a super travel and backyard scope for spur-of-the-moment
observing. It uses a 60mm f/5.9 fast focal ratio air-spaced doublet
optical system. The front element is a laboratory-grown calcium fluorite
crystal lens with hard multicoatings for maximum light transmission.
The rear element is hard multicoated low dispersion flint glass. The
combination of fluorite crystal and low dispersion glass provide
absolutely superb apochromatic color correction that is visibly better
than any ED glass doublet scope. Color correction is on a par with far
more costly triplet systems, but the light transmission is higher than
any triplet apochromatic system, due to the smaller number of optical
elements to scatter and absorb light. This Takahashi optical tube uses a
series of internal knife-edge baffles to block stray off-axis light for
the highest possible image contrast. For more details, click on the “Takahashi fluorite lens” icon above.
observers sometimes report that the scope’s high
contrast/diffraction-limited optics can be used at magnifications of
over 100x per inch of aperture on suitably bright objects (the Moon and
planets) on nights of exceptional seeing. Of course, we can’t guarantee
you’ll be able to reach this kind of magnification level with any sort
of regularity with this Takahashi (it would take the equivalent of a
1.5mm eyepiece and would produce a very dim 0.25mm exit pupil), but the
possibility of very high magnification is there.
Takahashi rack and pinion focuser has large ribbed focusing knobs that
are easy to grip and operate in cold weather, even when wearing gloves.
The optical tube has a flat boss above the focusing knobs, with two
mounting bolts to hold an optional finderscope, such as the
straight-through Takahashi 5 x 25mm with its very wide 9° field. The
supplied 1.25” eyepiece holder uses a non-marring nylon split
compression ring system to hold your star diagonal or eyepiece in place.
This system won’t scratch the barrel of your eyepiece or star diagonal,
as an ordinary brass or steel thumbscrew can. A simple twist of the
ribbed ring at the end of the focuser drawtube tightens the internal
compression ring to hold your diagonal firmly in place; while a twist in
the opposite direction lets you remove it with ease.
Takahashi optical tube itself weighs less than three lbs. It measures
only 17” long with dew shield in place. The optical tube is 80mm in
diameter and an optional tube holder is available to fit the scope on a
Takahashi mount (such as the altazimuth #TGS01 or the very compact #TGUL
Teegul Sky Patrol equatorial).
The 60mm Takahashi FS-60C. Expensive for a 60mm optical tube? Yes. Worth it? Emphatically yes.
|Manufacturer Part No
||3" and Under
||355/255mm w/reducer or 370mm w/flattener
||F/5.9 - F/4.4 w/reducer
|Light Gathering Power
|Limiting Stellar Magnitude
||60mm Flourite doublet
|Optical Tube Length
|Optical Tube Weight
Based on Astronomy
magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .