TS-Optics 70 mm f/5 Quadruplet Flatfield Apo with 3-Element FPL53 Objective

The 4-element apochromat with 70 mm aperture and 350 mm focal length has been developed by Teleskop-Service for astrophotography.

♦ Aperture 70 mm / focal length 350 mm

♦ Focal ratio f/5

♦ Fully illuminated and corrected image circle with 45 mm diameter - also suitable for full format

♦ 4-element quadruplet design with FPL53 triplet lens for an image without chromatic aberration

♦ The corrector element is permanently installed in the tube

♦ 3" rack and pinion focuser with 1:10 dual speed - suitable for accessories up to 6 kg

♦ Camera connection via M48x0.75 external thread or M54x0.75 internal thread

♦ 2" filter thread is integrated in the transition adapter to M48 for the connection of all standard 2" filters.

♦ A 360° rotation for the correct image section is built in

♦ The focuser offers a tilt option.

♦ Working distance is 70 mm from the M48 thread and 76 mm from the M54 internal thread - draw tube position inside

♦ Focuser travel - 30 mm

♦ Multifunctional carrying handle with photo thread

♦ Finder shoe for finders and Mini Guidescope


 

The TS-Optics 70 mm f/5 Flatfield Apo Refractor

The TS 70 mm quadruplet is an ideal traveling telescope for astrophotography. The apochromat offers a fully illuminated and corrected field of 45 mm diameter, so it is also suitable for cameras with full frame sensors. The FPL53 triplet objective corrects the chromatic aberration. The image is free of chromatic aberration on axis and in the field.
 

Camera connection to the apo

On the camera side, the apo offers an M48x0.75 external thread. From this thread you have between 40 mm and 70 mm distance to the focal plane, depending on the position of the draw tube. So you have enough space for all common astrocameras, SLR and system cameras. If you unscrew the M48 adapter, you will get a M54x0.75 female thread. You also gain 6.5 mm optical path. A 2" filter thread is integrated in this adapter.

We offer suitable T-rings for the M48 thread to connect DSLRs. If you want to use a camera with T2 connection, we also offer the transition adapter to T2.
 

Connection of 2" nebula filters or L-RGB filters

With the filter drawer TSFSLM48 you can integrate 2" nebula filters and L-RGB filters. The drawer requires only 18 mm optical path. So you will have no focus problems with astrocameras. For cameras with longer working distance (DSLR with adapter for example) we offer short camera mount adapters.
 

Visual observation through the TS 70 mm quadruplet

The quadruplet is a photo apo. The back focus is not sufficient for 2" or 1.25" star diagonals. The TSZPT2 T2 star diagonal prism allows observation with 1.25" eyepieces. For connection you need:

TSM5475-T2 ... adapter from M54x0.75 to T2 male thread
TSZPT2 ... T2 star diagonal prism
T2i-125 ... 1.25" eyepiece connector


The use of full frame sensors (DSLR and CCD) becomes possible. The adjacent image of the M78 region and the Horsehead Nebula was taken by the 71 mm apo and proves its astrophotographic suitability. 350 mm focal length and the large, very well corrected field are the basis for impressive large field images with higher resolution than typical telephoto lens shots offer.

The newly designed 3" R&P focuser holds even very heavy CCD cameras without tilting. The drawer offers 360° rotation and direct M48 and M54x0.75 connection. This is also sufficient for cameras with larger formats.

The 4-element optical system works more effectively than a conventional combination of refractor and corrector. The optical elements are ideally matched to each other*].

 

Aperture:	70 mm
Focal ratio:	f/5
Focal length:	350 mm
Optics:	4-element design in two groups
Lens:	Triplet FPL53 lens with air gap
Correction:	Fluoride glass corrector installed in the tube
Photographic field:	45 mm diameter fully corrected and illuminated
Focuser:	3" rack and pinion with dovetail ring and M48 connection - additional thread on the focuser M54x0.75 internal thread
Focuser travel:	30 mm
Weight:	3 kg
Length:	325 mm with retracted dew shield
Outside diameter of the dew shield:	103 mm
Working distance:	Maximum possible working distance from the M48 external thread 70 mm - from the M54x0.75 internal thread 76 mm

In the box:
♦ Imaging Star 70 mm Apo
♦ CNC tube rings
♦ Vixen style dovetail bar with photo tripod connection