AEC Home Page
Home Page
Products & Prices
TAKAHASHI
10Micron
Starlight Xpress
Feather Touch
Reduced Price Stock
Articles, Gallery, Feedback
Articles
Astro-Photo Gallery
Customer Feedback
Information
Trading Regulations
Contact A.E.C.
|
This Page Updated 9th March 2020
|
|
|
PROFESSIONAL STANDARD
TAKAHASHI EYEPIECES |
|
QUICK LINKS: LE & Hi-LE,
TOE, TAK-UW,
Abbe Ortho
|
|
|
|
TAKAHASHI LE & Hi-LE Series |
|
There are several types of eyepieces in the market. Some look very good; some have long eye-relief; some are sharp; some are cheap; some are expensive! However, when it comes to the highest contrast, maximum sharpness, high light transmission, good eye-relief and the best colour rendition, the Takahashi "LE" and "HI-LE" eyepieces have no rivals!
Below are a few comments from an expert amateur astronomer, who wrote a three-page test report on the Takahashi "LE" oculars.
Under test the LE Series oculars provided:
* Increased light transmission through the eyepiece. In other words all the LE oculars provide a brighter image;
* Increase in contrast in every case;
* Sharper images in every case;
* Increase resolution in every case.
The LE series improved every object throughout all the focal length ranges, and in comparison to both standard Plossl field of view and wide-field oculars. This is in brightness, contrast, image resolution and detail of bright and faint objects!
"...I cannot forget when, about two years ago, I had trouble splitting the double star Antares with my Takahashi FS-102 FL refractor, using five different well-known 7.5mm oculars. I started thinking that the said refractor wasn't as good as I thought. Eventually, it dawned upon me that may be I wasn't using the best oculars for the job. However, all my worries disappeared as soon as looked through an LE 7.5mm ED ocular, which fortunately I had still in stock. Antares' green companion, 7th-magnitude star, was there in all its glory!"
(Claude Voarino AEC, 2013)
|
 |
LE & Hi-LE Technical Specifications and Price
Part Number |
Model |
Apparent
Field |
Eye-Relief |
Weight |
Barrel Diam. |
TKA00520 |
LE-5mm ED |
52° |
10mm |
130g |
31.7mm |
TKA00521 |
LE-7.5mm D |
52° |
10mm |
115g |
31.7mm |
TKA00528 |
LE-10mm |
52° |
- |
- |
31.7mm |
TKA00522 |
LE-12.5mm |
52° |
9mm |
100g |
31.7mm |
TKA00523 |
LE-18mm |
52° |
13mm |
125g |
31.7mm |
TKA00524 |
LE-24mm |
52° |
17mm |
150g |
31.7mm |
TKA00525 |
LE-30mm |
52° |
20mm |
170g |
31.7mm |
TKA00526 |
HI
LE-2.8mm |
42° |
5.8mm |
130g |
31.7mm |
TKA00527 |
HI
LE-3.6mm |
40° |
7.5mm |
130g |
31.7mm |
TKA00531 |
LE-50mm |
52° |
40mm |
570g |
50.8mm |
|
|
|
CLICK HERE
for TAKAHASHI Eyepiece Prices |
|
|
|
TAKAHASHI TAK-UW Series |
|
Takahashi LE and Hi-LE Eyepieces are well known to be
the best eyepieces on the market for sharpness, colour
correction, contrast and resolution; now Takahashi has
expanded their range of professional-standard eyepieces with
the new
TAK-UW Extra-Wide-Field (90°)
Series |
 |
Takahashi TAK-UW Technical Specifications
Part Number |
Model |
Focal Length |
Apparent FoV |
Eye Relief |
Weight |
TKA00600 |
TAK-3.3UW
(10 Elements in 6 groups) |
3.3mm |
90 degrees |
12mm |
470g |
TKA00601 |
TAK-5.7UW
(10 Elements in 6 groups) |
5.7mm |
90 degrees |
12mm |
450g |
TKA00602 |
TAK-7UW
(8 Elements in 5 groups) |
7mm |
90 degrees |
12mm |
430g |
TKA00603 |
TAK-10UW
(8 Elements in 5 groups) |
10mm |
90 degrees |
12mm |
420g |
TAK-5.7UW mounted on
TOA-130 |
 |
|
|
CLICK HERE
for TAKAHASHI Eyepiece Prices |
|
|
|
TAKAHASHI Abbe-Ortho Series |
|
Takahashi Abbe-Orthoscopic Technical Specifications
Part Number |
Model |
Apparent FoV |
Eye Refief |
Weight |
TKA00700 |
Abbe 6mm |
44° |
4.8mm |
N/A |
TKA00701 |
Abbe 9mm |
44° |
7.5mm |
80g |
TKA00702 |
Abbe 12.5mm |
44° |
10mm |
N/A |
TKA00703 |
Abbe 18mm |
44° |
15mm |
110g |
TKA00704 |
Abbe 25mm |
44° |
22mm |
N/A |
TKA00705 |
Abbe 32mm |
44° |
28mm |
155g |
|
 |
|
|
TAKAHASHI TOE Series |
|
Ultimate visual observation is
observation with an excellent eyepiece for an excellent
telescope close to the diffraction limit. With this
combination, you can deliver the resolution of the telescope
optical system to the entire field of view. TOE eyepiece
developed based on this concept.
If the astronomical telescope equipped with a high
performance objective lens is used not only for our products
but also for other companies' products using the TOE
eyepiece, we can demonstrate the performance of the
objective lens without regret and high resolution that you
can fully convince over the entire field of vision we can
provide.
The TOA, FOA, FSQ, TSA, Mewlon-CRS etc. which corrected
aberration to the limit is not only used as a photographic
telescope, but also it is a system that you can fully
convince eye visual users by using TOE eyepiece .
The TOE eyepiece was designed with priority on easy-to-view
magnification, easy to use when observing the moon / planet
with high magnification. When TOE - 2.5 mm, TOE - 3.3 mm,
TOE - 4.0 mm are attached to TOA - 130, it becomes 400
times, 300 times, 250 times respectively. This is a
magnification that across the 320 times excessive
magnification for double stars, it is just a good focal
length lineup to change the magnification according to the
sky conditions. In order to obtain high magnification with
FSQ of f / 5, it is better to obtain a higher magnification
after attaching a dedicated extender to f / 8.
The apparent field of view is same as other LE series at 52
° wider than 40 ° of Hi - LE, and the eye relief also
secures 10 mm which is the same as LE - 5 mm and LE 7.5 mm,
the same as other eyepieces of Takahashi at parfocal, it is
easy to use enough as an ultra high magnification eyepiece.
Even if you use it for planet only for wide field of view,
it will be easy to use as it is easier to catch into the
field.
Evaluation of aberrations by Strehl ratio, spot
diagram
When the eyepiece is combined with the
objective lens, it becomes an afocal optical system which
does not form an image, and the evaluation of aberration was
difficult. In Takahashi, the design of the eyepiece is
optically designed as an afocal system in combination with
TOA - 130. In addition, as a wave optical evaluation, we use
the spot diagram as the Strehl ratio which is the ratio with
the diffraction limit optical system, geometrical optics
evaluation. If you look at the figure below, you can see
that the Strehl ratio falls to over 98% in the entire visual
range of wavelengths from 486 nm to 656 nm and in the whole
visual field.
There is not much to disclose the spot diagram of the
eyepiece so it is not familiar, but the round frame becomes
10 micro radians of the angle. The resolving power of an
aplanatic lens with a 130 mm aperture can be determined from
the dose limit equation as 0.9 s squares = 4.5 microradians,
so all the TOE series are far below the diffraction limit in
all fields of view. In addition, it can be seen that
magnification chromatic aberration (color misregistration in
the surroundings) which is difficult to completely eliminate
with the eyepiece is also very small.
Takahashi's unique lens composition
Optical design of the TOE series of 4 groups /
6 elements is Takahashi's original lens composition which
optimizes totalization of the front group 's smice lens and
the rear group' s master lens, and includes spherical
aberration, chromatic aberration, field curvature,
astigmatism , Distortion aberration, chromatic aberration of
magnification and other various aberrations are designed to
be minimized.
Also, by selecting the lens curvature that reduces ghosts
and flares, by designing hardware, you can observe the moon
and the planet with a good contrast image. Broadband
multi-coat is applied to each boundary surface of the lens,
and on the surface where necessary, a flat multi-coat with
less fluctuation in transmittance due to wavelength is
applied to correct the color balance and we are striving to
improve the contrast.
Also, sanitizing is done on the edge surface of the lens,
and we are trying to prevent stray light by carrying out a
matte treatment also on metal parts. |
Takahashi TOE Series Technical Specifications
Part Number |
Model |
Apparent FoV |
Elements/Groups |
Eye Refief |
Barrel Size |
Tube Diam. |
Tube Length |
Weight |
TKA00613 |
TOE-2.5mm |
52 º |
6/4 |
10mm |
31.7mm |
39mm |
76mm |
150g |
TKA00614 |
TOE-3.3mm |
52 º |
6/4 |
10mm |
31.7mm |
39mm |
72mm |
140g |
TKA00615 |
TOE-4mm |
52 º |
6/4 |
10mm |
31.7mm |
39mm |
68mm |
130g |
|
|
CLICK HERE
for TAKAHASHI Eyepiece Prices |
|
|
|
|
Return to Home Page |
|
. |
.
The above images and information and gathered from
various online sources
Return To Top of Page
* * * * * * * * * * * * *
|
|
|