Reciprocity failure doesn't stop you doing long exposures. It actually helps, if your goal is to make the exposure as long as possible. See e.g. http://itchyi.s

Reciprocity failure doesn't stop you doing long exposures. It actually helps, if your goal is to make the exposure as long as possible. See e.g. http://itchyi.squarespace.com/thelatest/2010/7/20/the-longest-photographic-exposures-in-history.html http://itchyi.squarespace.com/thelatest/2010/7/20/the-longes... Digital sensors obey the reciprocity law to a much greater extent than film: https://photo.stackexchange.com/questions/37241/does-reciprocity-failure-schwarzschild-effect-exist-in-digital-photography https://photo.stackexchange.com/questions/37241/does-recipro.... The problems the OP mentions are not related to reciprocity failure.