TS-Optics 115 mm f/7 EDT Triplet Apo - 2.5" RAP focuser - with optical test

TS Optics PHOTOLINE 115 mm f/6.95 Triplet EDT Refractor Telescope

The PHOTOLINE triplet ED Triplet Apo from Teleskop-Service offers an image which was available only from significantly more expensive refractors until now. By the neatly manufactured objective, the chromatic aberration is brought down to a non-bothersome minimum. The correction is noticable better than the one of comparable ED instruments.

The objective is not cemented, but airspaced. Of course, it is adjustable. We have compared imaging quality and sharpness in field with a similar instrument with 110 mm aperture and came to the conclusion that the visual and photographic quality is significantly better.

The advantages of the TS PHOTOLINE 115 mm Apo:

High class triplet objective with two special glasses - optical quality and colour correction better than from simple FPL53 dublets.

Retractable dew shield - thus perfectly suited for transportation - transportation length only approx. 71 cm!

High-quality 2.5" RAP focuser with 1:10 gear reduction for precise focusing

360° rotation of the focuser

M63x1 and M68x1 female thread for screwed adaptations

Noticable better illumination than all comparable apochromatic telecopes with smaller 2" focusers - the apo can be used up to full-frame.

CNC machined tube rings - no simple aluminum cast

The objective is mounted collimatable and temperature compensated. The cell will keep the adjustment - ideal for transportation

Every single apochromat is tested and perfectly adjusted on our optical bench prior to shipping.

Astrophotography with the PHOTOLINE 115 mm EDT

The apo is perfectly suited for astrophotography. The fast focal ratio allows short exposure times at high resolution. Extended nebular regions can be photographed with the apo very well as small galaxies or planetary nebulae.

Image at left: Cirrus Nebula - photographed with the Photoline 115 mm Apo with the ATIK camera 383L+ - field correction done by the TSFLAT2,5

We recommend following correctors for the 115 mm PHOTOLINE apo:

TSFLAT25Del - the bigger brother of the TSFLAT2. The corrector is designed for full-frame sensors and can be directly screwed to the female M63 thread of the focuser. The working distance from the M48 thread to the camera sensor is 55 mm.

TSREDM63-115 - the 0.8x field corrector is designed for the 115 mm f7 triplet lens. It reduces the focal length to 644 mm and improves the focal ratio to a fast f/5.6. The working distance from the M48 thread is 55 mm (T-ring and DSLR camera). The corrector is directly screwed to the M63 thread of the focuser.

TSRED379 - the PHOTOLINE telecompressor reduces the focal length to 632 mm and improves the aperture ratio to fast f/5.53. The working distance from the M48 thread is 55 mm (T adapter and DSLR camera). The reducer can be screwed to the female M68x1 thread of the apo.

Of course, correctors and adapters are linked in the accessories section.

Astrophotographic results obtained with this telescope on Astrobin

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

The EDT APO lens of the PHOTOLINE 115 mm:

For maximal contrast, the triplet objective is multicoated on every air-glass surface. It is mounted stress-free in a temperature compensated cell. The image is free from annoying chromatic aberrations and allows magnifications up to 300x.

Even when photographing bright stars, no blue fringe will affect the impression of the image.

The objective, in this version, is made for Teleskop-Service. By using the two special glasses (Lanthanum and FPL51), a very good correction of the chromatic error is achieved, in practice comparable to the correction of an FPL53 triplet lens.

The 2.5" RAP focuser

The ball bearing mounted focuser holds accessories up to approx. 5 kg without tilting or slipping. Camera sensors up to full-frame size are completely illuminated.

The drawtube is moved by a rack & pinion system. It is separated from the bearing section by ball bearings. Even under heavy load, it can be operated smoothly with fine movements.

The focuser offers a 360° rotation.

Through the 1:10 dual speed transmission, a more precise focusing is achieved.

Female M63x1 and M68x1 threads at the focuser allow screwed adaptions for astrophotography. We offer suitable adapters. Of course, a 2" and a 1.25" adaption are included.

This is how we hand over the apo to the amateur:

Every single APO is checked in our technical department before it is put into storage, in order to guarantee a consistently high product quality.

The mechanics are tested and the focuser is optimally adjusted.

The lens is cosmetically checked and cleaned. We also check that all counter screws are correctly tightened. These often loosen during transportation.

The optics are collimated and the result is checked on the optical bench. The telescope is given a serial number.

An optical test is carried out, which is enclosed with the telescope (star images and ronchi image on the optical bench in autocollimation).

Only then are the telescopes handed over to the warehouse and prepared for dispatch.

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

Photographic Results with the TS Photoline Apo 115/800 mm:

Great field correcture with the TSFLAT2 2" Flattener:

After my recent purchase of TS115 from your store I finally had a chance to do a real imaging test with it. I´m very happy with the performance of this scope with TSFLAT2 corrector (using suggested 111mm spacing). Sharp stars all the way to the edges on a APS-C size sensor, no false colors on bright stars etc. So I´m attaching an un-cropped image of M106 I took along with a picture showing corner stars. Please feel free to use these images in the product page if needed.

Thanks & regards,
Prem Kanakaraj


M106 - Galaxy goup

Sensor: APS-C Size

Image is uncropped

Mosaic with 100% perfect stars in the edges

Images from Wolfgang Ransburg through the Photoline 115 mm f/7 apo

NCG 6992/95 Cirrus Nebula - Supernova Remnant in constellation Swan.

Imaging camera: ATIK 383L+

Imaging telescope: Photoline APO 115 - image correction with TS Flattener (without focal length change)

IC5070 - Pelican Nebula in Swan.

Imaging camera: ATIK 383L+

Imaging telescope: Photoline APO 115 - image correction with TS Flattener (without focal length change)

Customer statement - Thorsten Temmel, 12.3.2017:

"A good refractor without chromatic aberration which not only shows its strengths at high field light intensity and 2´" eyepieces around the 40mm focal length, but is also a pleasure for open star clusters of the messier class. The price is acceptable. First of all I will use the refractor with its 2.5" focuser as a large field system on a double mounting on a CGX. An SC 9.25 will keep him company.

Two images of our customer Roger Kern

Messier 42, Orion Nebula - one of the most famous and popular objects in the winter sky.

Imaging camera Canon EOS 600D (modified)

Imaging telescope Photoline Apo 115 - corrector TSRED379

HDR image

Location, as in the following picture, 25 km away from Frankfurt a. M.

Messier 45, Pleiades - a near open star cluster in the bull.

Imaging camera Canon EOS 600D (modified)

Imaging telescope Photoline Apo 115 - corrector TSRED379

Three images taken by our customer Emanuele Bergamaschi from Oslo, Norway

Sh2-114, Flying Dragon Nebula - an emission nebula in the constellation Swan

Imaging telescope Photoline Apo 115 f/7

Antlia filters H-alpha and RGB

Imaging camera ZWO ASI294MM Pro

Exposure 145x 300 s for H-alpha and 65x 30 s for each RGB

Mount EQ6-R

NGC 1499, California Nebula - an emission nebula in the constellation Perseus

Imaging telescope Photoline Apo 115 f/7

Antlia 3.5 nm filters H-alpha and S-II

Imaging camera ZWO ASI294MM Pro

Exposure 140x 300s H-alpha and 60x 300 s for S-II

Mount EQ6-R

NGC 6888, Crescent Nebula - an emission nebula in the constellation Swan

Imaging telescope Photoline Apo 115 f/7

Antlia 3.5 nm filters H-alpha and O-III

Imaging camera ZWO ASI294MM Pro

Exposure 51x 300s H-alpha and 69x 300 s for O-III

Mount EQ6-R

Photograph by our customer Maicon Germiniani

Messier 20, the famous Trifid Nebula in the constellation Sagittarius

Imaging telescope TS Photoline Triplet Apo 115 f/7 (Apo115f7)

Focal reducer TS Photoline 0.79x Reducer Corrector (TSRed279)

Filters: Optolong H-alpha 7 nm (OPL-HA7-1) and Astrodon LRGB E Series Gen 2 (LRGB2_E27R)

Imaging camera ZWO ASI1600MM-Cool

Exposure 220 x 180 s = 11 h

Mount iOptron CEM60 (C70A - CEM70 as successor)

Two photographs taken by our customer Frank Lothar Unger from Bad Vilbel, Germany

[[kein Bild]]Comet C/2022 E3 (ZTF)

Imaging telescope Photoline Apo 115 f/7

Filter Optolong 2" UV/IR Cut

Imaging camera ZWO ASI294MC Pro

Exposure 53x 60 s

Mount Skywatcher AZ-EQ5-GT

[[kein Bild]]NGC 2158 and M 35, two open star clusters in the constellation Gemini

Imaging telescope Photoline Apo 115 f/7

Filter Optolong 2" UV/IR Cut

Imaging camera ZWO ASI294MC Pro

Exposure 64× 180 s

Mount Skywatcher AZ-EQ5-GT

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

Safety informations: PDF Download