Like new: TS-Optics ED 102 mm f/7 Refractor Telescope with 2.5" R&P focuser

TS-Optics 102 mm f/7 ED APO Refractor for astrophotography and observation

The 102 mm f/7 extra-Low dispersion - ED refractor from Teleskop-Service is an ideal transportable "Allround-telescope" for observation and astrophotography. The well corrected optics provide an almost aberration-free image, due to the moderate f-ratio and the built-in ED glas. You can use this APO refractor for astrophotography or for impressive visual observations. The good optics, the "photography-fit" 2.5" focuser and the solid construction guarantee joy and success and marvellous moments beneath the night sky.

The advantages of the TS 102 mm f/7 ED refractor:

very well corrected ED optics - adjustable

rigid and accurate 2.5" focuser - ball-mounted drawtube - rack & pinion mechanism

2" receptacle with reduction to 1.25" with ring clamping and additional photo-thread M63x1 and M68x1 for screw-connections

Robustly crafted tube (with retractable dew shield) and CNC tube rings guarantee optimal mechanical stability

The doublet ED objective:

The hand-manufactured objective is mounted in a temperature-compensated and adustable cell. It consists of two lenses including one ED element for a good correction of chromatic aberration. We use highest-quality multi-coating on each glass-air surface for optimal contrast.

The TS 102 mm f/7 ED refractor is perfectly suited for astrophotography:

The precise focuser and its light-gathering optics make the 102 mm ED refractor a well-suited telescope for astrophotograpy. To flatten the image field, we recommend the following correctors - they are also linked in the accessory section below

TSFLAT2 - 2" field corrector without focal length change ... outstanding illumination - also suitable for large sensors - a field of roughly 40 mm in diameter is illuminated 100%. The backfocus from the M48 thread of the corrector is 111 mm. With the TSFLAT2A adapter kit you will get a customized adaptation for your camera.

TSRED102 - 2" field corrector and focal length reduction ... the focal length is reduced from 714 mm to 571 mm. The f-ratio improves from f/7 to f/5.8. Exposure times shorten accordingly. We recommend this reducer for sensors up to 30 mm diameter, for example APS-C format. The backfocus from the T2 thread of the corrector is 55 mm.

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

Astrophotographic results obtained with this telescope on Astrobin

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

Pictures taken by a customer

Our customer Jimmy Keetman from Meppel (Netherlands) took some fantastic photographs with this telescope, which we would like to share with you:

Object: Helix Nebula (NGC 7293)

Photographer: Jimmy Keetman (Netherlands)
Imaging optics: TS-Optics ED Apo 102 mm f/7 refractor (TSED102F7)
Focal reducer: 0.8x reducer for 102 mm f/7 ED refractor (TSRed102)
Effective focal length with reducer: 571.2 mm (f/5.6)
Filter: SVBony SV220 filter (not in our product range, alternative from Optolong: L-eXtreme1)
Imaging camera: ZWO ASI533MC-Pro color astro camera, cooled (ASI533MC-P)
Mount: Sky-Watcher HEQ5-Pro SynScan (HEQ5skyscan)


Object: Eagle Nebula (M 16)

Photographer: Jimmy Keetman (Netherlands)
Imaging optics: TS-Optics ED Apo 102 mm f/7 refractor (TSED102F7)
Focal reducer: 0.8x reducer for 102 mm f/7 ED refractor (TSRed102)
Effective focal length with reducer: 571.2 mm (f/5.6)
Filter: Optolong 1.25" L-eNhance nebula filter (OPL-13801)
Imaging camera: ZWO ASI533MC-Pro color astro camera, cooled (ASI533MC-P)
Mount: Sky-Watcher HEQ5-Pro SynScan (HEQ5skyscan)


Object: Omega Nebula (M 17)

Photographer: Jimmy Keetman (Netherlands)
Imaging optics: TS-Optics ED Apo 102 mm f/7 refractor (TSED102F7)
Focal reducer: 0.8x reducer for 102 mm f/7 ED refractor (TSRed102)
Effective focal length with reducer: 571.2 mm (f/5.6)
Filter: Optolong 1.25" L-eNhance nebula filter (OPL-13801)
Imaging camera: ZWO ASI533MC-Pro color astro camera, cooled (ASI533MC-P)
Mount: Sky-Watcher HEQ5-Pro SynScan (HEQ5skyscan)


Object: Lagoon Nebula (M 8)

Photographer: Jimmy Keetman (Netherlands)
Imaging optics: TS-Optics ED Apo 102 mm f/7 refractor (TSED102F7)
Focal reducer: 0.8x reducer for 102 mm f/7 ED refractor (TSRed102)
Effective focal length with reducer: 571.2 mm (f/5.6)
Filter: SVBony SV220 filter (not in our product range, alternative from Optolong: L-eXtreme1)
Imaging camera: ZWO ASI533MC-Pro color astro camera, cooled (ASI533MC-P)
Mount: Sky-Watcher HEQ5-Pro SynScan (HEQ5skyscan)


Object: Sculptor Galaxy (NGC 253)

Photographer: Jimmy Keetman (Netherlands)
Imaging optics: TS-Optics ED Apo 102 mm f/7 refractor (TSED102F7)
Focal reducer: 0.8x reducer for 102 mm f/7 ED refractor (TSRed102)
Effective focal length with reducer: 571.2 mm (f/5.6)
Filter: Optolong 1.25" L-Pro nebula filter (OPL-LPRO1)
Imaging camera: ZWO ASI533MC-Pro color astro camera, cooled (ASI533MC-P)
Mount: Sky-Watcher HEQ5-Pro SynScan (HEQ5skyscan)


Object: Orion Nebula (M 42)

Photographer: Jimmy Keetman (Netherlands)
Imaging optics: TS-Optics ED Apo 102 mm f/7 refractor (TSED102F7)
Focal reducer: 0.8x reducer for 102 mm f/7 ED refractor (TSRed102)
Effective focal length with reducer: 571.2 mm (f/5.6)
Filter: SVBony UV/IR blocking filter (not in our product range, alternative: IR1-E)
Imaging camera: ZWO ASI533MC-Pro color astro camera, cooled (ASI533MC-P)
Mount: Sky-Watcher HEQ5-Pro SynScan (HEQ5skyscan)

Congratulations to Jimmy Keetman on these great pictures!

Safety informations: PDF Download