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1409 zł
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price without VAT: 1145,53 zł
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Focal reducer adapted for use with the Sky-Watcher 72ED refractor. It is used to reduce the focal length to 0.85x, improves field correction. At the same time, thanks to the shortened focal length, the telescope's light intensity increases to f/4.93, which in turn shortens the exposure time and increases the field of view, which is of cardinal importance in astrophotography. By using the Sky-Watcher Canon EOS M48 x 0.75 or Sky-Watcher NIKON M48 x 0.75 adapter, we can connect the camera to the reducer.
By using an M48x0.75 ring with a Canon or Nikon mount, you can connect your camera to the reducer. • multiplicity: 0.85x
• purpose: SkyWatcher Evostar 72 - flattener + reducer
• set elements: flattener in the cell, male-male ring 55 mm / 54 mm, two screw-on caps
• physical length of the flattener in the cell: 50 mm
• optical length of the flattener in the cell: 44 mm
• flattener cell thread on the device side: M48*0.75 (male, M)
• flattener cell thread on telescope side: 55 mm (female, F)
• physical length of the MM 55/54 mm ring: 20 mm
• optical length of the MM 55/54 mm ring: 6 mm
• physical length of the flattener with ring: 64 mm
• optical length of the flattener with ring: 50 mm
• weight: 271 g (including flattener 240 g, ring 31 g)
It should be remembered that this device is characterized by a constant backfocus value, i.e. the distance from the lens to the primary focus, e.g. the matrix of a digital camera. Generally speaking, both the reduction factor for focal reducers and its increase in the case of Barlow lenses change with the distance from the main focus, so you can easily choose the required value.
However, if we are dealing with flatteners or field correctors, the backfocus value must be precisely defined and cannot be changed. This means that a sharp image can only be obtained when the user sets the correct focal length, which sometimes requires precision of 0.1 mm.
Most of these types of variable focal length accessories have a manufacturer-specified focal length. However, if you can’t find this information in the user manual or on the website, a general assumption is that the typical back-focus value for astrophotography is 55 mm. If your camera is not designed for this value or you are using modified equipment, look at the products listed below that will solve your problem:
telescopes.pl/advanced_search_result.php?keywords=gso+m48
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