• 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 wavelengths (H-alpha and S II) to penetrate by a fraction over the prolonged exposure time. Even if this limitation was lifted by conversion to a suitable astro cut filter, which lets through red, colour CCD sensors for photography with narrowband line filters are not ideally suitable as only every fourth...
  • 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 the EOS series behave like most other chips from different manufacturers, they are from 1050nm rapidly insensitive to light. Therefore, it is pointless to continue to block past 1100nm. The effect of the BCF filter corresponds exactly to the curve shown on the website! We do not want to publish...
  • 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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