• My spectra show dark stripes (see mark in picture) - where do they come from?

    Dark horizontal streaks or stripes in the spectrum are caused by dust deposits on the slit plate of the spectrograph. A partial attenuation of the spectrum results from dust spots (“Donuts”) on the camera sensor. Let's start with the slit plate of the spectrograph. A dust grain deposited on the slit becomes apparent across the spectrum as a horizontal, dark line perpendicular to the spectral lines. The more frequently the DADOS is attached to the...
  • Off-standard single filter sizes from Baader - why not:

    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: Sorry (we know it would be so very much cheaper in production - and we would be so much more flexible to fill special requests) - but we have decided long ago to not cut or saw our filters from large plates because this would leave the coating stack open...
  • Unmounted Filters – which side should face the telescope?

    Question in Detail: 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"? Answer: 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...
  • Solar FAQ on www.astrosolar.com

    Please visit our website www.astrosolar.com/en/faqs for many questions and answers on our solar products, such as AstroSolar Film, Solar Viewers and mounted Baader Solar Filters.
  • ClickLock clamp is spinning where it shouldn't

    Question in Detail: I just received a Baader 2" Clicklock TAK-adapter M72. After a few uses it's spinning where it shouldn't. If I hold the inside on the bottom near where it threads onto the scope it works. Can you tell me what to do? Can I repair it? Answer: This might be a mistake done here during assembly. Please try this fix. If it does not help please return the Clicklock clamp to us...
  • What Narrowband / lines filter (O-III, H-beta, H-alpha, S-II) can improve the results of my Canon DSLR with APS-C Sensor?

    If you want to create absolutely beautiful color photos of bright deep sky objects (entry level) and wish to work with sophisticated techniques of Astrophotography (and the correct tracking), then your camera is ideal. For advanced working with long exposure times, i.e. with narrowband emission line filters, the DSLR is less suitable. The reason is partly in the manufacturer’s narrow cut filter that is installed before the camera’s sensor only allows some of the main...
  • Will the conversion affect the position of the focal plane?

    The ACF-/BCF- replacement filter has exactly the same effective optical thickness as the original AA filter. During the conversion process the focus is calibrated to the best of our ability. In addition: the conversion will not affect the auto-focus function at all. That is one of the advantages of having our professional modification service.
  • What is the difference between ACF and BCF Filters?

    Question: I am interested in the conversion of a Canon 400D / 40D. On their websites you can only find the filter curves and description for the ACF filter, not the BCF filter used for this conversion! What are the differences in the daylight suitability if it is not simply identical with the ACF filter? Also I noticed that the ACF filter from 1100nm is permeable. Is this a problem? Answer: The CMOS chips of...
  • Can you use external filters (like IR or UV) for the modification?

    No, it is absolutely necessary to use filters with the precise size and thickness to guarantee maximum quality. We cannot rely on unknown filters, in addition we are only specialized in astro modifications.
  • Does modifying my camera mean that it will be unusable for daylight photography?

    No, with manual white balance it is easy to recalibrate the images to daylight values. Only when using images for professional applications a second, unmodified body can be useful, cause there will be a slight reduction in dynamic range and slightly more moire effects visible.

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