61EDPH II - 6-Element Flatfield Apo 61 mm Aperture F/4.5

TS-Optics 61EDPH II - 6-Element Flatfield Apo 61 mm Aperture F/4.5 

The 6-element apochromat 61EDPH II with 61 mm aperture and 274 mm focal length has been developed by Teleskop-Service for astrophotography.

♦ Aperture: 61 mm

♦ Focal length: 274 mm

♦ High focal ratio f/4.5 for short exposure times

♦ Illuminated and corrected image field of 44 mm diameter - usable up to full-frame size format

♦ 6-element system with color-free triplet FPL53 obective lens and 3-element corrector

♦ 2.5" RAP dual-speed focuser with 360° rotation holds even heavy cameras

♦ CNC tube ring with universal dovetail bar with photo tripod connection and carrying handle is included in the scope of delivery

♦ Viewfinder shoe for viewfinders and mini telescopes is integrated at the CNC ring.

♦ Retractable dew cap

♦ Simple camera adaption via the M48 connection thread - working distance 55 mm

♦ 2" nebula filters can be easily adapted

♦ The lens has an aperture ratio of f/5.5 - in combination with the built-in corrector you get an effective aperture ratio of f/4.5.

The TS-Optics 61EDPH is designed for astrophotographers and nature photographers. It convinces with its compact dimensions and its high-quality 3-element FPL53 lens (glass from Ohara - Japan). The 3-element corrector has been specially developed for this apo and produces a corrected image field with 44 mm diameter and without chromatic aberration, ideal for full-frame cameras. The fast aperture ratio of f/4.5 allows short exposure times. The 61EDPH is a fast and portable travel apo for astrophotography.

Important: The corrector can be connected to the focuser in two ways. With the correct one, the long part points into the drawtube and the short one towards the camera.

Connecting cameras to the apo:

An M48x0.75 thread is available on the back of the sturdy 2.5" focuser. The working distance from this thread to the camera sensor is exactly 55 mm. This is ideal for all astro cameras and DSLR / SLR cameras. Matching T-rings can be found in the accessories section.

The TS 61EDPH provides a convenient connection for 2" nebula filters

Simply unscrew the corrector from the focuser and you will find the M48x0.75 female thread on the telescope side. Simply screw in the nebula filter and then screw the corrector back into the focuser. The working distance of 55 mm does not change. You can continue to use your adaption, whether with or without a filter.

Attaching the TS 61EDPH to mounts

The CNC tube ring has a GP/EQ5 style level dovetail bar at the base. You can attach the telescope to the appropriate quick couplings of mounts and travel mounts such as the Skywatcher Star Adventurer. Matching saddle plates can be found in the accessories section. In addition, the dovetail also has a 1/4" photo thread. The apo fits, like a telephoto lens, directly on every photo tripod.

The carrying handle is a real multifunctional part

The handle not only facilitates the mounting on the photo tripod, it is also the base for further adaptions. The handle has a long hole and a 1/4" photo thread. For example, you can mount a ball head on it and mount a second camera in parallel. Next to the grab handle there is a viewfinder shoe for finder scopes, mini telescopes or sighting devices.

Observation with the TS61EDPH

Although the apochromat was developed for astrophotography, it also allows observation. You have the following choices. Unscrew the photo corrector. You have an M63x1 female thread available. An M48x0.75 external thread is accessible with corrector. A push-in connection via receptacle is also possible, you can use both 2" and 1.25" accessories. Star diagonal mirrors or Amici prisms can also be connected via this connection to make beautiful nature, landscape and astro observations.