Our photo-visual, apochromatic 2.7x Barlow with ED glass for correcting the off-axis coma in Newtonian telescopes can now be combined with a second APM 2.7x Barlow. Mounted at a defined distance from each other, the magnification increases to 6.25x. Of course, the coma correction and image flattening are retained.
A single Barlow element provides a magnification factor of 2.7x and a fully illuminated image field of 26mm with a back focus of 105mm (measured from the middle of the last lens). For the 6.25x configuration, two 2.7x elements are simply connected to each another via an extension tube. In this configuration there is a corrected field of 14mm diameter at a distance of 84mm (measured from the center of the last lens).
The double Barlow allows high magnifications for planetary images on Newtonian telescopes with an aperture ratio that also allows high frame rates. To setup this, the camera sensor only needs to be mounted 84mm behind the middle of the last lens.
APM offers you an extremely flexible, high-quality system at a reasonable price.
- Modern optic calculation
- FK61 ED glass
- Visually and photographically usable
- High-quality MC coatings
- Excellent image quality
- Thread 28,4mm for filters 1,25"
- 2x APM coma-correcting barlow element 1.25" 2.7x
- Distance tube
- Protective covers
Our unique comacorrecting 1 1/4" ED Double Barlow - calculated by Gerd Güring - Germany.