Starwave ASCENT 102ED F11 Refractor Telescope Geared Focuser
The result is improved colour correction and contrast. It a geared focuser replaces the original Crayford style focuser allowing for heavier accessories, and the tube can be broken down offering 270mm of backfocus for binoviewing, or your own custom modifications for solar viewing with a PST module.
The ASCENT 102mm F11 ED is
particularly effective for visual observation of planets, the moon and
double stars and it copes with turbulent air (seeing) extremely well due
to it's long focal length. It is also a very capable solar
imaging telescope (with the appropriate filter) for white light (with
the Altair Solar Wedge), and of course Hydrogen Alpha. It is easy to
focus due to the extended depth of field and gives extremely sharp
images. The long focal ratio minimises eyepiece aberrations, resulting
an extremely flat field of view. Binoviweing is easy - just detach the
focuser and unscrew the mid-section, then screw the focuser back into
the tube. No tools are required to break the scope down for travel!
ED optics with geared focuser!
The machined and powdercoated aluminium tube can be broken down into two parts for easier transport, binoviewing or solar PST Mods which require a shorter tube.
- Proper Dual Speed Geared focuser with micro focusing (essential for fine detail).
- The 2" pushfit adapter has 3x thumbscrews and a brass compression ring. Diagonal barrels aren't marred, eyepieces and binoviewers or heavy Ha solar filters are firmly held and aligned.
Flat field and superbly high contrast with easy focusing make this an ideal visual telescope.
What you get:
Starwave 102mm F11 ED Doublet Objective, with full multicoatings on
all surfaces in a collimatable lens cell with QC serial number.
Guaranteed to arrive in perfect collimation.
- 2.5" Dual Speed Geared focuser with 1:10 ratio fine-focusing knob.
- Rear 2" pushfit adapter with 3x thumbscrews and inner compression ring.
- 2"-1.25" Push-Fit Adapter with non-marring brass compression ring.
- Optional 9x50 finder with metal body and front focusing
lens. Metal mounting stalk is able to attach direct to the optical tube
(screws provided) or with the Altair Universal Quick Release Finder
UNIFBR-QRB). High quality 23mm wide field eyepiece with laser etched,
independently focusing reticule. (Not the usual fare on finder scopes).
- Front push-fit metal dust cap, rear plastic plug style dust cap.
- Genuine CNC machined tube rings, fully adjustable for balance and rotation.
Metal dovetail plate so you can use the scope with just about any telescope mount including iOptron, Skywatcher.
- Metal dewshield 200mm length, 121mm diameter, retractable, can be unscrewed for lens cleaning.
- The optical tube is 100cm length and weighs about 4.6kg.
- The removable Binoviewer section is 120mm length therefore total tube length is 88cm when removed.
- Backfocus is 150mm from rear end of focuser to image plane. (270mm backfocus to the image plane if Binoviewer tube is removed).
The ED advantage. When
compared to Achromatic refractors of similar size, length and
focal ratio, the Starwave 102ED offers better geared mechanics for
focusing, and truer colour rendition thanks to the ED optics. The
Starwave 102 ED delivers a sharp "contrasty" image with good colour
correction and tight star images. The 80mm aperture gathers about 63%
more light than an 80mm refractor and the brighter image shows more
detail. With a higher power eyepiece or Barlow lens, this telescope will
show details withing the planetary
disc of Jupiter, the Great Red Spot, cloud bands of different sizes and
textures, as well as the four largest Galilean moons and their shadows
cast on Jupiter. The contrast is very good enabling you to see a jovian
moon against the brightly lit background of Jupiter. Saturn's rings and
Cassini division are easy to see at higher magnifications and cloud
bands are visible on Saturn as well as the polar caps. Mars shows
surface features and polar caps easily. Thousands of craters are visible
on the moon - enough for a lifetime of observation. Customers often
reported the previous "Classic Red" Achromatic version of this telescope
outperformed reflectors of 6 and 8" on planets and the moon in contrast
and suble detail. The ED version improves on the "Classic Red" version
both optically and mechanically with a modest price increase.
Daytime viewing. By adding an optional image-erecting prism diagonal, the Starwave 80 ED becomes a real performer when it comes to terrestrial and nautical observation, offering performance in the same category as ED spotting scopes costing many times the price. Simply increase the brightness on the Red Dot Finder and you can use the scope with pinpoint accuracy during daytime.
Mount choices: We recommend the Skywatcher EQ5 with motor drive for solar system imaging as a minimum, but the manual version of the EQ5 mount is more than adequate for visual planetary observation and you can add a motor drive later. If you prefer an electronic gadget-free experience, the Altair Sabre mount for visual observing, which requires no power. Please contact us for recommendations based on your intended observing style.
Astro imaging with the Starwave 102ED: A
smooth dual speed "non-slip" 2.5" Geared focuser is
supplied, with tension adjustment, able to carry a DSLR or CMOS camera
such as the Altair Hypercam or GPCAM, and filter wheel if required. The
optics are compatible with the Lightwave 0.8x field flattener / reducer.
These are positioned at approx. 55mm
from the rear flat face of the reducer/flattener to the camera sensor.
machined aluminium tube transmits heat to the optics, which benefits
users of dew control systems. It also allows the optics to shed heat
rapidly for fast cool-down to the ambient temperature - a must for best
performance with any telescope.
Finder scopes and auto-guiding: You
can attach the optional finder scope to easily locate astronomical
objects. There are two ways to attach it. Firstly by means of the two
screws provided and secondly by means of the Universal Quick Release
Bracket (see options when ordering). The Altair 60mm Deluxe RACI Finder
Scope is also compatible, and attaches to the focuser using the
Universal Quick Release Finder Bracket.
Magnification: The magnification of a telescope is determined by dividing the
telescope focal length in mm by the eyepiece focal length in mm.
example the Starwave ASCENT 102ED has a 1122mm focal length, which, when
used with the Altair Ultraflat 24mm eyepiece yields 47x magnification.
(E.g. 1122mm divided by 24mm = 47x magnification). If you use a Barlow
lens (such as the Altair 2x Flat Field Barlow) just multiply the
magnification by 2x. In this case, the result is 94x.
Here's a table with Altair Ultraflat and Planetary eyepiece focal lengths, and the resulting magnifications with the Starwave 102EDF11:
|Eyepiece focal length:||6mm||7mm||10mm||12.5mm
Finding objects in the telescope. Using
a low power eyepiece at around 25x you can quite easily spot a bright
or large object by sighting along the telescope, however fainter and
smaller objects would benefit from the optional "finder scope"
For imaging with your DSLR, you'll need a 50mm M48 Extension Tube and M48 DSLR adapter to insert into the 2" focuser aperture.
For imaging with the Altair Hypercam or GPCAM cameras, you can attach a camera or filter wheel by means of the rear 2" "push-fit" visual back (which has 3x thumbscrews for extra tight grip and zero flex).
Starwave ASCENT 102ED F11 technical specifications:
Optical Design: Fully Multicoated ED Doublet lens in collimatable cell
Aperture (mm): 102 mm (4")
Focal Length: 1122 mm
Focal Ratio: F11 (F8.8 with 0.8x reducer)
Optional Finderscope: 9x50 focusing objective (206.6mm focal length). Finderscope Eyepiece: 23mm focal length with laser etched reticule, independent focusing for eyeglass users.
Highest Useful Magnification: 200 x
Limiting Stellar Magnitude: 13
Resolution (Dawes): 1.14 arc seconds
Light Gathering Power (Compared to human eye): 212 x approx. (7mm pupil)
Optical Tube Length: 100cm / I metre
Optical Tube Weight: 4.6kg Approx.
- Harrison Telescopes
- Tring Astronomy Centre
- Rother Valley Optics
- F1 Telescopes
- Io Astronomy Please note: IO Astronomy voluntarily ceased trading with large unpaid debts affecting the entire UK astronomy industry. You may contact us for problems / issues with Altair or iOptron products ONLY - or try Darkframe Optics / Dave Woods. Unfortunately, we will not be able to support undeclared products bought from the ex-directors after the company ceased trading.
North America & Canada orders:
- Land Sea & Sky (Takahashi America) USA
- Cloudbreak Optics USA
- Ontario Telescopes Canada/North America
Products can be ordered online from Altair with tracked insured shipping to anywhere in the world. For large items shipping price may need to be re-quoted.
Russia orders: Please contact.