Posted 20 hours ago

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

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Joined in 2023

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The sad effect is that we cannot offer other sizes unless the inquired production quantity were in the range of 250 to 500 pc (depending on size) and the tooling rings or square holders will be paid for, which serve to precisely center each individual filter substrate within the rotating calotte inside the coating chamber. Sorry - as explained above - we just will not coat onto large plates and cut any shape from them, also because such large plates cannot be polished optically flat in the same way we do it. 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. Quite often we receive requests for a single filter in an off-standard size. In all cases we are sorry that we must answer as follows:

Ich habe beide Filter an C/2023 E1 (ATLAS) verglichen. Komet Atlas ist derzeit (Mitte August 2023) noch um 9m5 hell und damit von einem dunklen Standort aus etwas für zumindest größere Ferngläser. Der Komet ist recht groß, 6'. screw-in thread for 2" eyepieces on telescopes as well as for lens-side mounting on binoculars up to 45mm aperture, and finally 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.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“. Swan-Band-Filter wurden bislang nur von Lumicon produziert. Baader hat einen Filter herausgebracht, der sich von den Lumicon-Filtern unterscheidet. 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. High quality optical filters are not cheap. Hence, it is also no surprise if observers complain about „unaccountable“ picture deterioration when using cheap filters in front of binoculars, tele-compressors or Barlow lenses, either visually or photographically. The higher the magnification, the softer and more blurred the picture appears when using a cheap filter, for both visual and photographic observations. 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.

Make sure all items returned are complete; any incomplete items will not be credited and will be classed as unauthorised.

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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. 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.

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