Andy 274 Posted August 1, 2022 Share Posted August 1, 2022 Not a question but a post to help alleviate pain & suffering So I've been helping some members in Facebook astro groups with their backspace issues. All flatteners/reducers require backfocus - typically 55mm. This isn't a religion but a guide. Last night was 1st light dialling in my Altair 130EDT-F. I added 0.5mm to the image train & the difference was profound. See the comparison images using abberation inspector Quote Link to comment Share on other sites More sharing options...
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