What do you look for in an astronomical filter? Everyone has different requirements and goals and with a myriad of filters available today; how do you choose the right filters to unleash the full potential of Astrophotography? You can clearly see the amount of "doubly ionized carbon" (the carbon excited to glow radiates only in the wavelengths 511 and 514 nm ) were emitted by the comet. If you fail to return the goods, we will collect them, and will charge you the direct cost of collection. If you fail to take reasonable care of the goods before they are returned to us, and this results in damage or deterioration, we will charge you for the reduction in value. The “polished“ sheet is coated as the whole, and afterwards the filters are cut out in the desired size. This production method for filters is drastically less expensive than the substantially more sophisticated manufacturing of a Baader filter. In addition, different sized filters can be cut on demand, reducing inventory costs. Our 1.25" filters have a M28.5 male (and M28.5 front female) thread / our 2" filters have a M48 male (and M48 front female) thread

Based on these considerations, soon after the release of their new CMOS filter range, I asked Baader Planetarium if they would lend me a CMOS blue filter Baader RGB B-Filter – CMOS-optimized I just bought LRGB 36mm unmounted filters. I have question: which side of filter should be placed towards telescope? Is it better way of distinguish than "more shiny surface towards telescope"? Lumicon hat 25 nm Halbwertsbreite und erfasst die [OIII]-Linie mit, ist also auch als [OIII]-Filter zu benutzen. Der Baader-Filter ist nur 15 nm breit und blendet diese Linie aus. Dieser Fakt allein wird wohl an einem Kometen nichts machen, wenn er nicht gerade vorm Zirrusnebel steht :) Eine geringere Halbwertsbreite heißt aber höherer Kontrast. Swan-Band-Filter wurden bislang nur von Lumicon produziert. Baader hat einen Filter herausgebracht, der sich von den Lumicon-Filtern unterscheidet. The commercial disadvantage of this technology lies in the fact that we cannot produce any filter size by simply cutting it from a sheet. For custom-made filters in a requested size we need a minimum production run of 250 pieces.

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Always put the more reflective side towards the telescope side. To guide you we already put a small arrow on the filter rim, on those filters were the position matters. This arrow indicates which face of the filter should be directed towards the sky (telescope-sided). All cell-mounted filters are already oriented in a way that the most appropriate filter face is facing the sky when the filter would be mounted directly onto the front end of the nosepiece of a camera. They say that if only one cosmetically flawless, smooth glass surface is required, it is not necessary to achieve a high degree of plane-parallel polish. They further believe it is adequate to cut filters from a big stained glass sheet – usually in the format 20x20 cm – and to so-called “raw polish” the filter on both sides. With this process, the glass surface is slightly molten and all saw scratches and surface inaccuracies are invisibly levelled. But so-called „raw-polished“ glass surfaces are completely irregular and deform the wave front of the light significantly! Also a only mag 16.2 faint C/2022 U2 (ATLAS), which is overtaken by the mag 5.8 bright C/2022 E3 (ZTF), could be photographed: By combining the Swan-Band and luminance filters, I was not only able to work out fine details down to the nucleus of the Comet in the subsequent image processing, but also the carbon that was excited to glow became clearly visible in the final image with the help of the Swan-Band filter.

It would be highly interesting to make a comparison exposing a comet through both an OIII filter and the new C2 filter. Thus, with the larger carbon gas cloud, one could deliberately highlight the inner nucleus of the comet.Please allow 3 working days for us to process a return. We will organise a suitable date and time for our couriers to collect the item

If you cancel you must return the goods to us at your own expense. You are responsible for the risk of loss or damage when you return the goods, so you should take out adequate postal insurance to cover their value.Every single cell mounted filter delivered to our customers is cut as a round or square disc in the according size (1¼", 31mm, 36mm, 2", 50,4mm, 50x50mm, 65x65mm), and then is polished plane to a quarter wavelength on both sides on a computer numerically controlled polisher. After that, the polished blanks are submitted to the costly coating procedures. This sequence is also used for all unmounted filters.