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good evening everyone, I have some doubts and I hope someone can give me a hand, I have a skywatcher quattro 150 with its coma corrector all together with a QHY163C I don't use filters or anything else, what types of extensions do I need to solve the backfocus problem?
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It will depend on the coma corrector. Let's assume that the coma corrector you use has a back focus of 55mm: the QHY163C already consumes 17.5mm so you would require another 37.5mm in extensions.
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| Distinct awarded users | Total awarded images | |
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| Image of the day | Top pick | Top pick nominations | Total submitted | |
|---|---|---|---|---|
| Deep sky | ||||
| Solar system | ||||
| Extremely wide field | ||||
| Star trails | ||||
| Northern lights | ||||
| Noctilucent clouds | ||||
| Landscape | ||||
| Artificial satellite |
| Image of the day | Top pick | Top pick nominations | Total submitted | |
|---|---|---|---|---|
| Backyard | ||||
| Traveller | ||||
| Own remote observatory | ||||
| Amateur hosting facility | ||||
| Public amaeteur data | ||||
| Professional, scientific grade data | ||||
| Mix of multiple sources | ||||
| Other | ||||
| Unknown |