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PrimaLuceLab GIOTTO 120 Smart Flat Field Generator
Celestron Skyris IR-block filter...
SHP-25FLAT
Nuovo
Sharpstar 2.5" universal field flattener for refractor, suitable for sensor size up to full-frame format and much more (corrected image circle up to 55 mm). This field flattener is deisgned to correct the image of apochromatic refractors from 500 to 1000 mm just by varying the working distance (from 87 to 106 mm). Fully Multy-coating on each lens surface and blackened interior for reflection suppression. Includes M48 adapter.
Sharpstar 2.5" universal field flattener for refractor, suitable for sensor size up to full-frame format and much more (corrected image circle up to 55 mm). This field flattener is deisgned to correct the image of apochromatic refractors from 500 to 1000 mm just by varying the working distance (from 87 to 106 mm). Fully Multy-coating on each lens surface and blackened interior for reflection suppression. Includes M48 adapter with distance already calculated for 700 mm focal length triplet refractors such as the Sharpstar AL-107PH.
This field flattener can be adapted to any apo refractors with focuser of at least 2.5" and first directly any focuser that shows a Zeiss standard thread (female M68x1) or an M63x1 female thread, such as in many sharpstar refractors. The refractor must have at least 145 mm of back focal length from M68 thread (150 mm from M63 thread) in order to reach focus with this field flattener.
CCD side there is a male M69x1 thread, but the box includes also a M48 adapter with distance already calculated for 700 mm focal length triplet refractors such as the Sharpstar AL-107PH.
The Sharpstar 2.5" field flattener is optically compatible with lot of refractors actually available in the market, you will just have to set the proper working distance in order to achieve optimal correction.
Following a list of the suggested metal back distances:
Intermediate distances can be tried in order to reach optimal performances. We remind that you have to consider the optical backfocus of your system, including - for instance - also any optical filters used in the imaging train (any optical filter adds 1/3 of its physical thickness to the backfocus). If you have any doubts you are invited to contact us, we can help you to define the proper distance for your imagin train.
There are dozen of adapters commercfially available that can help you to fit your CCD or CMOS camera to the Sharpstar 2.5" field flattener. We can also build custom high-precision adapters. You are invited to contact us for help.
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