We have prepared an updated chart which covers a field of 35'x35' and shows stars down to magnitude 15. This chart contains precise V-magnitudes by Dalibor Hanzl. Stefano Pesci of ISN has prepared a more detailed chart of NGC 3877.
Comparison stars An updated list of comparison stars with revised magnitude data is available.
For comparison the old list remains accessible. Photometry Updates Photometry Update No.