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In anticipation of T CrB outburst, I re-redesigned my spectrometer a bit..
The main reason was to make it more compatible with my existing astro-photo gear.
Because the alignment mechanism in old version was adding ~30mm to backfocus distance (shown on first image), a lot refocusing was needed to switch from one configuration to other.
Also, the old version was quite long (grism was inserted into C11 flange opening when attached), so I couldn't use it with FR.
This grism version is shorter in overall, so now there is no clash with FR glass, and it can be screwed in 1" barrel as any other filter. To maximize the scale, I inverted the optical train order (previously, the prism was in front of SA100, now it is at the back - hopefully this will not offset the benefit of smaller star images with FR too much).
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