02-05-2014, 04:57 PM
Hello and many thanks for the responses. Purple fringing yes. CA no. Is my take. I will certainly do some testing by stopping down. Of course, this kinda defeats the purpose of using a fast lens for astro shots but nothing is perfect. Probably that $1500 nocton lens would be no better. There also are some pshop actions that claim to remove purple fringing. I will try them as well. Shouldn't require a rocket scientist to write such an action.
Kinda disappointed that this otherwise fantastic lens has this issue while the 12-40 zoom does not. Could a different coating have fixed the problem in the 75? Wonder how the upcoming 40-150 Pro zoom will fare? Course, both zooms are over a stop slower. More engineering radeoffs I imagine.
Lastly, I read somewhere, and will test, that the E-M1 camera auto-removes CA but the E-M5 does not. I can vouch for the latter but not yet the former. Can anyone confirm this?
Thanks again.
George
Kinda disappointed that this otherwise fantastic lens has this issue while the 12-40 zoom does not. Could a different coating have fixed the problem in the 75? Wonder how the upcoming 40-150 Pro zoom will fare? Course, both zooms are over a stop slower. More engineering radeoffs I imagine.
Lastly, I read somewhere, and will test, that the E-M1 camera auto-removes CA but the E-M5 does not. I can vouch for the latter but not yet the former. Can anyone confirm this?
Thanks again.
George