spreadsheet for fixed camera em1/em5

Discussion in 'Astrophotography' started by stuartpm3, Mar 6, 2014.

  1. stuartpm3

    stuartpm3 Mu-43 Rookie

    Feb 9, 2014

    Im doing a spreadsheet for the forum. I need to know what is the max exposure time you can use with the em1/em5 to avoid star trails with a fixed tripod mounted camera. I need to know the shutter speed seconds. Focal length of lens and object or declination any user has used which just avoids trails.

    The spreadsheet will output limiting magnitudes for stars and nebulae as well as max exp time at any declination to avoid trails. User inputs iso. Focal length and lens aperture as well as declination.

    Because of weather I cannot calibrate myself at the moment. Any help appreciated.