Manufacturer: -TS Zubehör
Product number: Flat315R

EUR 409,90


incl. 19 % VAT (DE)  
The VAT indicated refers to that applicable in Germany. After logging in, the VAT amount is adjusted to the applicable VAT of the stored delivery country. Therefore, the final price may vary accordingly.
excl. 6.95 € shipping costs (DE)  
Please log in to calculate shipping costs to your country.
more details to the shipping costs ...

  • On stock
  • Only 1 pcs left in stock





There are no reviews for this product
  • Details..
  • Technical data..
  • In the box..
  • Reviews..
Aurora Flatfield Panels for even Flats
These flatfield light panels use a thin electroluminescent foil, the Aurora flatfield foil, which emits an even, gentle white light after an external voltage is applied to it. The most important advantages are:
Perfectly even illumination - brighter areas which would deteriorate the flat are excluded.
A broad, continuous spectrum which may be used with emission line filters
As the foil itself emits the light of being backlighted, the design can be significantly lighter and flatter design is possible.


Color:
The light from the foil looks blueish/white. Most foils from other sources seem to be white to the human eye, but the light is made of discrete emission lines. Due to this the foils from most other sources at not suitable for narrowband emission line filters. Gerd Neumann tested the products of all manufacturers worlwide and selected these foils because they are best for astronomical applications.

The spectrum of the Aurora is not made of some emission lines (like most foils do!). It has a very broad, continuous emission across the whole spectrum. This fact makes the foils great for narrowband emission line filters.

Brightness:
The brightness of the Aurora foil can not be controlled electronically. If the foil is too bright for your setup (very fast instruments), you should place one or more sheets of paper or a piece of white plexiglass between the foil and your telescope. The brightness is very even across the whole surface. It works well for the most critical observations, even photometry or spectroscopy.

Power supply:
The foil is illuminated by an external high voltage, which is produced by the inverter you have also received. The high voltage is produced at a very low amperage, so there is no danger to you. A normal wall transformer does not work!

Please use the foil only with the supplied matching inverter. Connecting a foil to a inverter of the wrong size reduces the lifetime very much!

Using a 12 V inverter makes mobile use possible.


Choosing the right size - practical tip from Teleskop-Service:
The useable diameter of the flatfield panel should be at least 15% larger than the aperture of the telescope. Also, the larger the sensor, the larger the flatfield panel should be. Thus a telescope with 200 mm aperture should be equipped with a flatfield panel of at least 230 mm illuminated diameter.

It is not a problem to use a larger flatfield panel. We recommend to make a mask. Plastic foam has proven to be a a good material. On one hand such a mask guarantees a neat centered seating at the telescope, on the other hand you can use the use the panel with the telescope pointing in any direction, as there is no need to swivel the telescope upwards.
Diameter:378 mm
Illuminated area:315 mm
Illumination principle:Electroluminescence
Power supply:12 V DC (approx. 350 mA), with cigarette lighter plug
Electroluminescent foil in plastic frame
Inverter 12 V DC
Cables
User guide

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.


Recommended accessories




General Accessories

Power Supply

Similar Products

Reviews