To use all the features on this website,
JavaScript must be enabled in your browser.

TS-Optics Doublet SD Apo 102 mm f/7 - FPL53 / Lanthanum Objective

Name: TS-Optics Doublet SD Apo 102 mm f/7 - FPL53 / Lanthanum Objective
Brand: -TS Teleskope
SKU: TSAPO102F7
Price: 999 EUR
Rating: 4.5 (2 reviews)

This Photoline 102/714 mm apochromat has a great FPL53 / lanthanum glass objective for very good color correction and one of the best 2.5" R&P focuser in this class.

Aperture 102 mm / focal length 714 mm / focal ratio f/7

Adjustable doublet in temperature compensated cell

Image free of chromatic error due to "Extra-Low-Dispersion" FPL53 apo element from Ohara (Japan) and lanthanum glass element - with this, we achieve a better chromatic correction than comparable apochromats with doublet lenses.

Shorter cooling time than with triplet lenses, thus quicker operation possible

Internal baffles for a more contrasty image

One of the best 2.5" focusers in its class, with 360° rotation, ball bearings - adjustment via pinion - with dual speed gear - motor focus can be retrofitted

M68x1 and M63x1 thread (female), 2" and 1.25" receptacle are available

CNC tube rings and GP style dovetail bar are supplied

Dew shield retractable for transport. Transport length only 60 centimetres.

Manufacturer: -TS Teleskope

Product number: TSAPO102F7

EUR 999,00RRP EUR 1.348,00you save 25.9% (EUR 349,00)

incl. 19 % VAT (DE)

The VAT indicated refers to that applicable in Germany. After logging in, the VAT amount is adjusted to the applicable VAT of the stored delivery country. Therefore, the final price may vary accordingly.

excl. 9.95 € shipping costs (DE)

Please log in to calculate shipping costs to your country.

more details to the shipping costs ...

rating: 4.5 of 5

Roll over image to zoom in or klick it. The appropriate zoom factor ist adjustable with the mouse wheel.

TS-Optics Doublet SD Apo 102 mm f/7 - FPL53 / Lanthanum Objective

This Photoline 102/714 mm apochromat has a great FPL53 / lanthanum glass objective for very good color correction and one of the best 2.5" R&P focuser in this class.

Aperture 102 mm / focal length 714 mm / focal ratio f/7

Adjustable doublet in temperature compensated cell

Shorter cooling time than with triplet lenses, thus quicker operation possible

Internal baffles for a more contrasty image

One of the best 2.5" focusers in its class, with 360° rotation, ball bearings - adjustment via pinion - with dual speed gear - motor focus can be retrofitted

M68x1 and M63x1 thread (female), 2" and 1.25" receptacle are available

CNC tube rings and GP style dovetail bar are supplied

Dew shield retractable for transport. Transport length only 60 centimetres.

Details..
Technical data..
In the box..
Reviews..
FAQ..
Manufacturer infos..
Safety informations..

TS-Optics PhotoLine 102 mm f/7 Dublet FPL53 Apo

This apochromat from the PhotoLine series from Teleskop Service offers very good performance in any application area. By combining FPL53 (Ohara, Japan) and a lanthanum glass element, a chromatic correction is achieved which matches the one of an FPL53 triplet - with significantly quicker cooling down. Even at highest magnification, the image remains free from distracting chromatic aberration. This means that the fast refractor is not only very well suited for astrophotography and wide-field observation, but also for moon and planets.

Very fine mechanics guarantees j oy with the telescope and universal application capabilities

The PhotoLine 102 mm apo offers, besides a lens of the latest generation, also a mechanical equipment which leaves nothing to be desired. Thereby the performance of the lens can be fully implemented photographically or visually.

Advantages and features of the PhotoLine 102 mm f/7 apo:

102 mm f/7 FPL53/lanthanum glass lens for an image free of chromatic aberration

Ball bearing supported focuser with rack & pinion adjustment. The support is decoupled from the adjustment of the draw tube.

Overdimensioned draw tube for full illumination even with full-frame format.

1:10 speed reduction for precise focusing.

Motorized focusing can be retrofitted.

M68x1 thread (female) for threaded adaptions and 2" / 1.25" for pushed adaptions

Internal baffles and very good internal blackening for contrasty images

Retractable dew shield for easy transport

CNC tube rings and GP style dovetail bar in the scope of delivery

Astrophotography with the TSAPO102F7:

The Photoline SD-Apo 102 mm f/7 is suitable for astrophotography without restrictions, but as with any fast refractor, the field must be corrected so that the stars at the edge are still nicely round. We offer the following options for this, the correctors are linked in the accessories section. In the FAQ you can find out how to get to the M63x1 internal thread on the focuser.

TSFL102F7-2E - 1.0x Flattener: This corrector does not change the focal length. It is calculated for the 102mm f/7 2-element apo. The corrector is screwed to the M63x1 female thread on the focuser. The working distance from the M48 camera thread is 55 mm. The adapter also has an intermediate thread for 2? filters.

TSRED102F7-2E - 0.8x corrector: This corrector reduces the focal length from 714 mm to 571 mm and improves the focal ratio to f/5.6. It is designed for the 102mm f/7 2-element apo. The corrector is screwed to the M63x1 female thread on the focuser. The working distance from the M48 camera thread is 55 mm. The adapter also has an intermediate thread for 2? filters.

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin

Technical Information

Teleskop-Service has collected a lot of helpful information about refractors and provided it in English as a PDF file: refractors.pdf

Aperture:	102 mm
Focal length:	711 mm
Focal ratio:	f/7
Lens design:	Air-spaced 2-element object lens (douplet)
Apo element:	FPL53 from Ohara (Japan) + lanthanum glass
Tube material:	Aluminum - CNC manufactured
Tube weight:	4.1 kg incl. tube rings and dovetail rail
Tube length:	600 mm
Tube diameter:	105 mm
Rear tube thread:	M103x1 female
CNC rings:	5x M6 female thread each side
Distances of the M6 threads:	1x center, 2x 19 mm from the center, 2x 30 mm from the center
Outer diameter of dew shield:	121 mm
Focuser:	Ball bearing mounted 2.5" rack-and-pinion focuser
Connection at eyepiece side:	1.25", 2" and M68x1 and M63x1 thread (female)
Backfokus:	123 mm from 2" receptacle / 161 mm from M68 thread

Photoline 102 mm f/7 apo

CNC tube rings

GP style dovetail bar

Finder shoe

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin

Review from an happy customer - TSAPO102f7

The first lens is positive made of ED (FPL53) glass. Lanthanum negative lens - inside. Interestingly, the laser beam test showed that the light scattering is greater on the second (inner) lens, that is, the quality of the ED glass of the front component is really high. Measured aperture 102 mm - without internal cuts.

Focuser

On the focuser case (white) there are two pairs of plugs for attaching the finder and / or guide shoes. In addition, there are screws for adjusting the focus of the focuser, but I did not need to touch them - the focuser walked well, leaving the center of the field of view from the axis was not observed, and the helical gear / rack provided accurate positioning of the receiver (eyepiece), without backlash, delay and lateral displacements. Measured backfocus 150 mm. The adapter is 1.25" traditional: there is a thread for a 2" filter, a compression ring, a fixing screw with a wide head.
A good focuser for both visual and photographic use.

Image Quality Testing

Testing was performed in visual mode on an artificial star with a magnification of 177x. The air temperature during the tests ranged from 18C to 26C. A study of off-frame showed the following:

Residual secondary chromatism is almost three times less than that of equal achromat. That is, it is still not a superachromate - during observations, chromatism noticeably distorts the diffraction pattern: the brightness of the first diffraction ring increases, the second becomes noticeable, dark gaps between the rings are flooded with light. And the green filter makes the picture cleaner - closer to the perfect Airy picture. But at the real contrast of the image, and even more so the resolution limit, this residual chromatism has practically no effect. Staining (color halo) is noticeable only in very bright objects, such as Vega and / or in the study of extrafocal.

Spherical aberration due to the inevitable spherochromatism is undercompensated for red and a little for green, overcompensated for blue. That is, spherical aberration turned out to be compensated somewhere in the blue part of the spectrum. For visual use, I would like compensation in yellow-green, but in general, the residual spherical is small - practically insignificant. Spherochromatism makes overcompensation of violet significant.

A pleasant surprise was the minimal artifacts of the star image associated with misalignment - and this is the main scourge of budget apochromats. The diffraction image in the center of the field of view is as close as possible to the axisymmetric. Only during transient thermal processes (lens cooling) does a small hint of the clamping triangle appear. After complete cooling at high magnification, a noticeable slight astigmatic deformation of the first and second diffraction rings is apparent. I don?t know how it will be in winter conditions, but in summer, nighttime cooling of the instrument does not cause problems.

Observations with a 2 "eyepiece (30 mm Explore Scientific) showed that the effect of image curvature (which is unavoidable for any one-component refractor) is significant. To compensate for the curvature at the edge of the field of view compared to the center, refocusing of the order of 2 mm is required! In fact, the image curvature (like concomitant astigmatism) is felt when using any long-focus 2 "eyepiece and the more noticeable, the higher the quality of the correction of the eyepiece. Even when shooting with an APS format camera, this telescope will need a field corrector (rectifier).

Conclusions and recommendations

I liked the telescope with the quality of implementation. In fact, this is a close to ideal visual tool of a small aperture. The influence of aberrations (both calculated and due to manufacturing / assembly errors) against the background of diffraction is small and does not limit the observer in any way. The mechanics of the pipe are almost flawless. For fans of visual observations - definitely recommend.

My personal opinion - compact lightweight scope. Now it my favorite scope. "My daaarling" :)

Vladimir Sokolov. Saint-Petersburg, Russia

Question:
How do I access the M68 and M63 connection threads?

Answer from Teleskop-Service:
To access the M68x1 internal thread, the 2" adapter must be unscrewed. The 2" adapter is secured by three small grub screws, which must be loosened first. To access the M63x1 internal thread, the M68x1 adapter must also be unscrewed from the extension tube. This adapter is also secured by three small grub screws. The adapter can only be unscrewed once these have been loosened

Manufacturer / Importeur:	Teleskop-Service Ransburg GmbH
Street:	Von-Myra-Str. 8
ZIP / City:	85599 Parsdorf
Country:	germany
Telefon number:	+49 89 99228750
Email:	info@teleskop-service.de
Website:	www.teleskop-express.de