Im struggling with confusing information from Optolong, compared to my real-life expercience. maybe someone can give the definitive answer?
I mounted my new Optolong L-Extreme into my new ZWO filter drawer. But started to wonder if i mounted it the right way. So started to search for information.
The info from Optolong:
On their site they tell that a simple test shows wich side should face the camera sensor. It can be found here: http://www.optolong....tXvQXurp8Mkon2c
The theory is that the 'most functional membrane' can be identified by a ghost image test. The most functional membrane blocks more light so it will show less ghosting. Seems logical to me. As a result you should face the side with the most ghosting to the camera sensor.
The real world test on my filter:
I did the same test (with almost the same pencil). The result was that the ghost image was most visible on the side that faces the scope?!! I added the pictures here to show the result. The threaded side is the one facing the sensor, but that seems to have to face the scope?
I know i could unmount the glass and turn it the other way around. But is that what Optolong wants us to do with every filter? I hope it is produced the right way, for a filter that costs $300. I also hear people say 'i don't think it matters wich side you use, i never had any problems', but that doesn't meet the Optolong explanation on their own site. And my intention is to use this filter the best way possible, and i am kind of confused right now.
Scopeside- the test of the surface that faces my scope
sensorside - test of the surface that faces my sensor
assembled- hot the drawer is assembled, showing the scope side
optolong explanation: screenshot of the explanation on Optolong's site.
Edited by Mbuna, 25 February 2022 - 10:56 AM.