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With older DSLRs and unguided AP the options are limited but dithering will make a world of difference. Calibration frames help as well.
Bore da... UKAstronomer
The length of unguided exposures is limited to a large extent by the equipment and polar alignment. ISO and aperture are probably the most useful variables in this case. Importantly, exposing to get signal over read noise - dark noise is not so limiting with shorter exposures, particularly if the shots are dithered generously. You can almost get away with bias and flats, which makes life a whole lot easier.
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