Optec - Lepus HD C9.25 EdgeHD Telecompressor Lens

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The Celestron C9.25 EdgeHD OTA is one of a kind among Celestron's EdgeHD models with a somewhat slower primary mirror when compared with the other SCT telescopes manufactured.

SKU: OPT-19410
Manufactured by:
Optec
 

Product Description

The Celestron C9.25 EdgeHD OTA is one of a kind among Celestron's EdgeHD models with a somewhat slower primary mirror when compared with the other SCT telescopes manufactured. Like the other EdgeHD models, a aperture corrector plate and 3-element corrector lens group in the baffle tube make the C9.25HD a completely aplanatic SCT outline. The C9.25HD highlights an optimized back-focus of 146mm and native focal ratio of about f/9.9. The field is flat with an image circle around 42mm in distance across.

Joining the Lepus-HD C9.25 Edition telecompressor to the rear of the OTA will yield an approximate f/6.4 light cone at the suggested on-axis back-focus distance of 96mm. The powerful field of view is reduced to 28mm with some light loss past around 24mm which is correctable with great flat-fielding methods. Since the C9.25HD corrector lens group is mounted near the end of the baffle tube at the exit port, the Lepus-HD C9.25 Edition includes a 5mm thick aluminum spacer to guarantee the corrector lenses and telecompressor lens don't physically connect.

Ronny Kaplanian of Australia spent a few weeks perfecting the back-focus distance between his Celestron EdgeHD C9.25 and Lepus telecompressor. Optec found that the ideal separation on-axis is around 4mm shorter for the C9.25HD compared with the first outline back-focus of 100mm.

 

The NGC2818 picture at left was given by Ronny Kaplanian and shot with his Celestron C9.25 EdgeHD, Lepus-HD C9.25 Edition telecompressor, and his Starlight Xpress SXVR-M25C camera in a monochrome mode with isolated RBG separated exposures. The image sensor on the SXVR-M25C measures 23.5mm x 15mm for a diagonal measurement of almost 28mm. The picture was joined and further processed by Terry Hancock with just slight cropping to remove the stacking artifacts. 

Specifications

Name Optec - Lepus HD C9.25 EdgeHD Telecompressor Lens
Manufacturer Optec
Model OPT-19410

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