calibration shots

[xtcdean]

hey, simple question to throw at you guys, how many of each calibration shots do i load in dss, if i stacked say "30" 60 sec light subs, would just one of each do the job? is there a formula or rule of thumb.

thanks in advance

[msh1]

the more the merrier i use 29 darks 30 flats and i think a master bias of 200 shots i don't use dss though i use nebulosity

[lensman57]

use a CC

hey, simple question to throw at you guys, how many of each calibration shots do i load in dss, if i stacked say "30" 60 sec light subs, would just one of each do the job? is there a formula or rule of thum

thanks in advance

Hi,

You want enough of them so the Sigma algorithm can do its bit, about 30 should do the job, at times I have used 51 but as I use a cooled CCD most of the time the darks are not necessary, something that is essential for DSLRs.

A.G

[xtcdean]

ok cool, just trying to find a light plan that works, what exposure would you use to take the 200 shots, is nebulosity free?

[xtcdean]

so lets say i took 200 light frames of m31 at 60 sec expo, and added 30 darks and 30 flats, should i get something worth the time spent taking the snaps?

[lensman57]

so lets say i took 200 light frames of m31 at 60 sec expo, and added 30 darks and 30 flats, should i get something worth the time spent taking the snaps?

It sure will be but unless you have some compelling reason for this I would have gone for 30 ~ 40 of 180s and  30 of 30s for the core. look forward to seeing the results.

A.G

[msh1]

there is a trial version of neb but its not that expensive http://www.stark-labs.com/nebulosity.html   80$

also you want odd number of darks something to do with the algorithm but don't ask what cuz i haven't a clue

[xtcdean]

It sure will be but unless you have some compelling reason for this I would have gone for 30 ~ 40 of 180s and  30 of 30s for the core. look forward to seeing the results.

A.G

cool guys thats great advice ill post as soon as i have a clear sky hopefuly this weekend