Visual angle (visual size) of this nebula is several times bigger than visual angle/size of the full Moon; therefore I had to use the shortest focal length I have available. For DSOs like that I have small newton telescope with aperture 150 mm and focal length 600 mm. The focal length was reduced by ASA reducer to 438 mm.

Heart nebula is very dim DSO; therefore narrow band is good option to get some contrast. I managed to collect a lot of data for all 3 channels: Ha, OIII and SII. Final picture was composed in Hubble palette. This means OIII goes into blue, Ha in green and SII into red channel.

IC1805_Heart_2015-11-09-30C-600s-17Ha21OIII25SII-SQM_20_3_FL430_Ha2OIII2SII_noG