Swan Extra Slim Filter Tips - Full Box Of 20 Total 2400 Tips

Product Information

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. 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. 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 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"?

Make sure all items returned are complete; any incomplete items will not be credited and will be classed as unauthorised. The Swan-Band filter is indeed a very special filter with central wavelength at 512 nm and ≤15nm half-width – for the first time without any O III transmission. It is therefore suitable for a variety of unusual applications some of which require further investigation, whether as an “O III parallel filter” to better remove stars from the image, or as a solar filter in a previously inaccessible section of the spectrum. We would be pleased about your experience reports also apart from the comet photography. Since the C2 filter allows only the green carbon transmission to pass through, the dust tail illuminated by the sun could be highlighted very clearly with the new 20 nm H-alpha filter. Should you really have some reflections with both positions it can be more effective to add a spacer between filter and camera, eventually shifting the reflection out of the image field. With focal correctors having curved surfaces changing the filter-lens distance could help also. If you receive any damaged items on your delivery, please state the full extent of the damage on the driver’s delivery note when signing for the goods.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: 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! In the old days, colour filters for visual planetary observations were not screwed in the front part of the eyepiece, but were simply placed between the eyepiece and the eye. Plane-parallelism of these filter glasses was not important, because they were not in the optical path of the telescope.

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. Just in time for the introduction of the new C2 Swan-Band filter, a bright comet, comet C/2022 E3 (ZTF), offered itself as a test object. Our customer Andreas Bringmann was one of our first testers - see more under TAB Review 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. Swan-Band-Filter wurden bislang nur von Lumicon produziert. Baader hat einen Filter herausgebracht, der sich von den Lumicon-Filtern unterscheidet. March 2021: The idea behind the visual use of blue filters from RGB palettes is that they have much higher transmittances in the blue value and steeper curve slopes than the usual blue filters known from planetary observation - e.g. the Wratten 80A/B/C filters or also Baader's dark blue 435nm and light blue 470nm filters. A CCD or CMOS blue filter allows much more light of the blue reflection nebulae of our galaxy to reach the eye and at the same time filters out the stray light in the green and yellow very effectively.The variety of uses for filters in amateur astronomy has considerably increased during the last decade, enabled by both more accurately manufactured optical accessories, and, above all, by the “digital revolution“. The images were taken on January 29, 2023 directly from the outskirts of Mannheim, Germany. The test series consisted of exposures with a normal LPS luminance filter (Hutech IDAS LPS-P2) and single exposures with the Swan band filter.