TAKAHASHI

  

EPSILON - 180

Some images taken using Epsilon-180:

Amazing image taken by Martin Campbell, Dungannon, NI, using a modified Canon EOS 50D at ISO800

Also taken by Martin Campbell using a Canon EOS 5D MKII

 

Takahashi introduced  this awesome astrograph with an incredibly fast photographic speed, to meet the demands of  modern large chip CCD cameras, including digital SLRs, as well as deep sky video cameras such as the Stellacam 2. The 180mm aperture Epsilon has a focal length of  only 500mm, and a focal length of f/2.8.   The above picture shows the E-180 on EM-200 mount. 

 

A   B   C   D

 

A.  The Epsilon 180 tube assembly measures 570mm long, with an outside diameter of 232mm, and weighs 10.7Kg (23.5 lbs).    It can easily be mounted on EM-200 (20Kg) capacity, or EM-400 (35Kg).

For more details on EM-400, including details of  mounting plates, click here Note that the tube rings and top cross-plate are included when ordering the tube assembly complete with finder, but not the lower mounting plate, except when the E-180 is ordered together with a Takahashi mount. If you already have a Takahashi mount, then you will need to order the lower plate separately. Note also that if  you order the bare ota, as is the case with all Takahashi instruments, the cradle/tube rings are not included, allowing you to make your own arrangements.

B. Close-up showing the focuser.  The large capstan wheel enables the whole focuser and camera assembly to be rotated to any position in order to frame a field as required.  The 2 element ED field corrector is integral to the focuser and connection to the CCD camera is via a Wide T-thread, which has a M54 x 0.75mm thread.  The back-focus from the end of  the focuser is 56mm, which is the standard for  film and digital SLR cameras.  Thus a Canon EOS can be directly mounted using a Wide T-Ring. Also included with the tube assembly are adapters for  1.25" eyepieces, for visual observation or for use with a deep sky video camera such as the Stellacam 2.

C and D. Views of  the spider showing the considerable offset of  the secondary mirror, and the collimation adjustment screws. The secondary mirror measures 80mm on the minor axis.

 

E   F   G   H

 

E. View looking into the E-160 focuser, with reflection of  my digital camera in the centre. Note the two focus knobs at right. For fine focus adjustment a MEF1 microfocuser can be fitted - details of  this are on the TSA-102 page - click here.  The whole assembly rotates and is locked at any desired angle by the silver knob at top left.  

F. View showing a mounting plate for  a finder or  other accessory.  Brackets for Takahashi finders can attach to the mount plate either directly or  using the FQR-1 quick release plate - details also on the TSA-102 page.

G.  There is another mounting plate at the mirror end of  the E-180.  You could use one plate for an optical finder, and one plate for  a video finder, such as Stellacam 2 with eg 16mm lens

H. View of  spider end showing reflection off primary mirror.  The primary mirror is actually oversized at 190mm, which ensures superb accuracy all across the 180mm usable field

 

 

Great image taken of  M31 by Martin Campbell from Antrim. This shows what can be done with a DSLR ! Martin took 38 exposures of  2 minutes each, using a Canon 20DA at ISO 1600.  Click on image for larger version.

For CCD imagers, the image circle is 44mm (60% non-vignetting), which means that the full diagonal of  a 35mm frame is covered, and the 100% field is larger than a full circle can be accommodated in a 35mm frame, which measures 36mm x 24mm.  EOS and other cameras with chips that are 2/3 the size of  35mm, will have very nearly 100% non-vignetted field. At a 500mm focal length the image scale is 2.7" of arc per pixel, for a CCD with 6.5micron pixels.

Fields of  View for  2/3 35mm size chip, and for full 35mm size chip:

                              Horiz°                 Vert°              Diag°

2/3 x 35mm          1.8                        2.75               3.3                  

Full 35mm           2.75                      4.1                 4.9 

 

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