Lots happening on our star at the moment as this strip shows. This represents a 4 pane mosaic taken with the 127mm PST mod @ 1900mm fl DMK31. This is quite an achievement as have been doing quite a lot of work lately to minimise the effects of sweetspotting in the humble PST etalon. Judging by how even this is I would say is a success. Next stage of modding the PST mod is to replace the collimating lens in the etalon assembly with one more suited to the focal ratio of the 127mm scope (f9.3). This will negate slight vignetting in the system and will mean this PST mod is operating at full 127mm aperture. The replacement lens has been purchased from Edmund Optical.
