|
If you know how to use the Internet then these are the specifications of the 127mm scope under question when it was first released..........
At f/7.48 the focal ratio of this OTA is tailored for fast wide field astrophotography and uses the finest Japanese FCD1 ED glasses (Extremely Low Dispersion glass). ED glasses were created to achieve a very small change in the refractive index at different wavelengths of light. This makes the Scope an excellent, affordable choice for a fast ratio, high performance optical work. Its fully multi-coated lenses ensure maximum light transmission from a triplet air-spaced optical design providing very good overall colour correction.
SPECIFICATIONS:
- Aperture: 127mm fully mutli-coated ED triplet.
- Air spaced optics hand figured glasses.
- Focal Length: 950mm - f/7.48
- Full multi-coated lenses
- Solid Aluminum optical tube (white)
- Full internal blackening and baffling
- 2-inch 10:1 Crayford focuser
- 1.25 -inch eyepiece adaptor
- Weight 7.1 Kgs
- Dimensions - 84.6 x 15.6 cm
you will note that it states the glass is FCD1 ED glass and that the triplette is made from Japanese hand figured glass.
All of these statements have been stated previously by me and were true in 1998-9. If you can prove my statements incorrect then do so.
If you can prove that the current NG scopes have the same specifications then show me.
Allan
|