Product OverviewThe Askar M54/M48 Backfocus Adjuster is an astronomy imaging accessory used to fine-tune camera spacing in an optical train. It is intended for astrophotography setups where precise backfocus adjustment is required between a telescope, reducer, flattener, filter drawer, OAG, or camera.Who Is This Product Best For?This accessory is best for astrophotographers who need small spacing adjustments to dial in field correction, improve star shapes, or match the required camera-side backfocus for their imaging system.Why Choose This Product? Useful for fine backfocus adjustment in imaging trains. Supports M54/M48-style astronomy connections. Helps tune camera spacing for reducers, flatteners, and correctors. Compact accessory for deep-sky astrophotography setups. Recommended Uses Backfocus adjustment for cooled astronomy cameras. Spacing correction with reducers and flatteners. Imaging-train tuning for better corner star performance. Accessory spacing in M54/M48 optical systems. Compatibility and Accessory NotesConfirm thread compatibility, required spacing, and available mechanical clearance before use. This draft uses placeholder pricing and should be reviewed manually before publishing.Important Limitations This is an adapter/accessory only; it is not an optical telescope or camera. Exact compatibility depends on the user's telescope, reducer/flattener, filter drawer, OAG, and camera setup. Pricing is set to $0.00 as a manual placeholder. Our RecommendationOntario Telescope recommends this accessory for imagers who need to fine-tune backfocus spacing in an M54/M48 imaging train.
