A perfect travelling apochromat - for observation and astrophotography

Under the lead management of Teleskop-Service, this high-quality Photoline triplet apo with FPL53 element from Ohara (Japan) came to life as optimal travelling apochromat.

Even at higher magnification, the image has no annoying chromatic error, with excellent correction at the same time. It is one of the best and fastest 80 mm apos we have seen. The fast focal ratio of f/6 not only keeps the refractor very short, it also provides short exposure times for astrophotography.

Best mechanics ensure an excellent image quality over years and success in astrophotography

Even the best optics can be used successfully only if the mechanics is right. Here, savings were often made in the wrong place. This is not the case for the Photoline 80 mm f/6 apo.

The advantages and features at a glimpse:

• Rack-and-pinion focuser, plain bearing mounted. The support is decoupled from the drawtube drive.
• Oversized drawtube with 60 mm clear aperture for full illumination even if full-frame sensors are used.
• 1:10 dual speed system for ultra-precise focusing
• High-quality CNC tube with internal baffling and very good internal blackening - no annoying stray light
• M68x1 thread (female) allows for screwed and thus stable adaptions for astrophotography
• Retractable dewcap - only 37.5 cm transportation length
• Modern and multi-coated 3-element lens with FPL53 as APO element
• High-quality CNC rings and GP style dovetail bar with photo thread connection
• Each ring has 3 M6 threads (female) on top side, one of them in the middle, two in 30 mm distance at the side
• Finder shoe is mounted

Visual use - spotting scope and astronomical travel telescope

The TLAPO804 can be configured with a star diagonal mirror, eyepiece and finder to form a lightweight telescope for travel, and a long-focus wide-angle eyepiece can be used instead of the finder.

If an Amici prism is used instead of the zenith mirror, you get a spotting scope for landscape or bird watching. We recommend a zoom eyepiece, as it is more convenient and its field stop will usually not be larger than the clear aperture of the Amici prism, thus avoiding vignetting.

A tested combination of Amici prism and eyepiece on the one hand and tripod with tripod head on the other hand consists of the items TSA245 and HypZ as well as FGX3 and TSLH-20, which are all linked in the accessory recommendations. However, eyepieces with more focal length or true field of view can also be used, because the vignetting does not start abruptly.

Astrophotography with the TLAPO804:

The Photoline 80 mm f/6 apo is suitable for astrophotography without restrictions, but, as with any fast refractor, the field has to be corrected for keeping the stars nicely round even at the edge. For this, we offer the following options which are linked in the accessories section.

• TSFlat25DEL - universal 2.5" field corrector without focal length change: The corrector is suitable for all sensors up to full frame format. For the connection to the apo you need the adapter # M68a-M63i, with this the corrector is screwed directly to the M68x1 connection thread.
  The working distance from the M48 connection thread to the camera sensor is 65 mm. If you are using a camera with 55 mm flange focal distance, such as an SLR with T-ring, you will also need a 10 mm M48 extension # TSVF210.
• TSCFRED80 - 0.8x corrector for 80 mm f/6 triplet poss:The corrector is calculated for triplet apos with 80 mm aperture f/6 and offers the optimal performance. The focal length is reduced to 384 mm and the focal ratio is improved to fast f/4.8.
  For the connection to the apo you need the adapter # M68a-M63i, with this the corrector is screwed directly to the M68x1 connection thread.
  The working distance from the M48 thread is 55 mm. For most cameras, there are already ready-made adaptations for the M48x0.75 connection with this distance.
• TSRed279 - 2" Photoline reducer and corrector: The 0.79x corrector reduces the focal length of the apochromat to 379 mm and increases the speed from f/6 to f/4.74. The reducer is directly clamped by the 2" receptacle. The working distance from the T2-thread is 61 mm. We recommend the reducer for cameras up to APS-C sensors. For the adaption to a DSLR camera, you can need (for example):