As the Transparent Spider is costly to make with the required wavefront error, I also make two 10" f: 5. 4 Standard Newtonian model telescopes and five 12" f: 4. 0 Standard Newtonian model telescopes with various CCD camera sets that all feature spiders that have 3 curved vanes for Astrophotographic applications.  Here, the pair of bright spikes associated with each vane that emanate from the image's bright spots, are made "invisible" by spreading their brightness over the entire image, slightly degrading image contrast.
For strictly scientific applications I make two 10" f: 5. 4 Standard Newtonian model telescopes and five 12" f: 4. 0 Standard Newtonian model telescopes with various CCD camera sets that all feature spiders that have 4 straight vanes. This gives the enhanced stability of the fourth vane.  The locations of the objectionable bright spikes are controlled by rotating the telescope tube in its mounting by special Rotating Rings.  Here a part of the image obscured by a bright spike can be uncovered by rotating the spike away from that part of the image, - without degrading image contrast.
Without a ccd camera, all the above telescopes are limited in their Resolving Power by the quality of the Atmospheric Seeing. However, the image shifting capabilities of these cameras that gives them the ability to "autoguide" also imparts the ability to correct for positional shifts of the image due to poor atmospheric seeing. Thus the AO7 software from SBig lends all my telescopes all the benefits of "Adaptive Optics" when capturing images.  Note:  This type of adaptive optics cannot improve upon poorly formed images resulting from poor grade mirrors.