Manufacturer: Tecnosky
Product number: TKLIGHTROUND230

EUR 179,00


incl. 19 % VAT (DE)  
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excl. 6.95 € shipping costs (DE)  
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Product expected to be available from 05.04.2024

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Teknosky Flatfield Panels for uniform flats
The panel has a pink/white color and the spectrum is controlled by spectroscope. Any uncolored area will not harm the image, only the colors need to be recalibrated during processing.

The brightness is fixed, it can be varied using an adjustable 3/4.5/6/9/12 V power supply (available as an option). The panel works only with a high voltage inverter (but with very low, non-hazardous current).

The foil is very thin but extremely robust and can be used directly on the telescope. The simplest solution is to place the tube vertically and put the flatfield generator on it.
Each flatfield foil is attached to a white plastic disk, which not only reduces the light and makes it more homogeneous, but also serves to stiffen it.

Notes
Connect the panel to the inverter before turning it on.
Each panel has a scratch-resistant protective film on the plastic pane, which must be removed.



Selecting the right size - Practical tip from Teleskop-Service:
The usable area of the flatfield foil should be at least 15% larger than the aperture of the telescope. The larger the sensor, the larger the flatfield foil should be. Therefore, a telescope with 200 mm aperture should be equipped at least with a flatfield foil with 230 mm illuminated area.

It is no problem to use a larger panel. We recommend the construction of a mask. Foam has proven to be a good material. On the one hand such a mask guarantees a nice centric fit on the telescope. On the other hand you can use the flatfield foil at any telescope position and you don´t have to swing the telescope upwards.
usable diameter:230 mm
Flatfield panel
Plexiglas pane
12V inverter

How do I get a good flat field image?
A good flat compensates for edge shading (vignetting), but also for darkening caused by dust on the filter, sensor or corrector. The background becomes even, the contrast can be raised further to make finer details visible in faint nebulae. The following basic settings should be noted:
The ISO or gain setting must be the same as for the lights, i.e. the actual astrophotography.
Telescope, camera and accessories, such as filters, off-axis guider etc., must be the same as for the actual exposure, also the position of the focuser should be unchanged.
The exposure time should be so short that nothing is "burned out", i.e. overexposed. Only in this way can the flat unfold its full effect. We recommend an exposure of 30-50%. The flat should not be burned out, but it should also not have any unexposed areas.


How do I find the right exposure time with the shooting software, for example Maxim DL?

The ADU value (Analog Digital Units) helps here. Every capture program shows this value when you move the mouse over the image. In the center of the image, where the illumination is highest, the ADU value is highest. The longer you expose, the higher this value becomes. If the ADU value is higher than the maximum value of the camera, the image is overexposed. A camera with 16 bits has a max. ADU value of 65536, one with 14 bits has 16384, one with 12 bits only 4096.

The exposure time of the flat should be so short that in the middle of the flat the ADU value is at most 50% of the maximum value of the camera. Then the flat looks well exposed. We recommend to take at least 10 flats per exposure and to process them to a "master flat".

If the flatfield box is too bright, that means it always produces overexposed images, then a white paper, which is fixed in the flatfield box, helps. This will dim the light and allow for slightly longer exposure times.


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