MDM Trouble Report for 2015 Jun 11 Telescope: 2.4m Observer(s): Wagner, M., Neric, M., Zinn, J., Wilber, A. (ASU, OSU) Instrument: OSMOS Problem(s) Encountered: We were attempting to take a narrow-band Halpha band image of V1974Cyg with the 6567 filter. Upon a 300s exposure, we found significant abberation and halos around each object in the field. We went to 6691/78 band and took another 300s exposure to find a similar problem. We were not able to remedy the issue, but noted that a 300s r-band exposure did not seem affected by the problem. ------------------------------ Submitted on 2015 Jun 12 [4:22:33]