More aperture for astrophotography and vistual: provide good image with high contrast; ED glass means visible colour aberrations are reduced to minimum with sharp image; all lens surfaces have been provided with multi coated to reduce reflections;
For astrophotography; sometimes more focal length is required in order for them to be seen at a reasonable size in the image especially for compact objects; there is also no shadowing apparent on small image format camera chips for big plus;
Larger diameter has more scope for lenses: 2 inch diameter allows to insert 2 inch eyepieces into this barlow with double magnification; the large lens diameter also means you will notice no shadowing in the image;
Visual back for Telephoto lenses with T2 thread
The adaptor can be screwed onto any T2 male thread and provides a clamp for 2" accessories
Astromania 2" T-2 Focal Camera Adapter for SLR Cameras - Bundle with - T/T2 Lens Mount Adapter Ring for Sony-NEX
KWD 12.500
Astromania AccuFocus Electronic Telescope Focuser - Bundle with - 1.25" High Precision Double Helical Focuser
KWD 44.500
Astromania Adjustable Guiding Scope Rings 102 mm Inside Diameter (Pair) - for Telescope Tube Diameter or Finders 48 to 100mm
KWD 26
Astromania M48X0.75 Female Thread to 2" Adapter - Lets You Easily Adapt from an M48 Thread to a 2" Barrel
KWD 13.500
