Hotech Field Flattner - To get flat and sharp astro photos to the edges ...
Refractors have the property to show optical errors on the screen. A non-uniform plane but a curved frame is the result. This field curvatures are ugly, the stars have floated, not act sharp or distorted. But especially for astrophotography with a refractor the aesthetics of the picture should be in the foreground. Fortunately, there is a little helper ...
Same focal length - flat field
Astro shots sharp edge to edge. Would not that be nice? By Hotech FieldFlattner you manage this plan - and easy!
Put this little chic designed component to your refractor, whether Apochromat or achromatic. Your telescope should have an aperture ratio between f / 5 and f / 8 have, because it was expected the appearance. Many Flattner pave the picture, however, change the focal length. Their big advantage is that the focal length of your telescope remains the same.
What good is a Field-Flattner which generates mistakes again, only because he has been tilted in the eyepiece? As often is the trick in detail. Therefore, the Hotech Field Flattner has a self-centering mechanism. Place the 2 "adapter into the eyepiece and turn the integrated ring until the amended himself in the focuser pinched by compression rings. There is no tilt by lateral pushing bolts and tolerances in the 2" excerpts are no longer an issue. This brand new mechanical concept was patented - and your photo it brings a better quality
The benefits at a glance:
- suitable for refractors of f / 5 to f / 8
- absolutely flat image, right into the corners of the field
- against reflexes: Multicoating on the optical surfaces
- no tilting: 2 "sleeve with self-centering mechanism
- 2 "barrel / camera side T-2 thread
- requires 55mm distance from the backstop to the chip level