06-28-2020, 09:45 AM
My reply is too late, presumably.
The way to do it is to use a step-up ring from 67 to 77, then you can mount the 77mm just fine. These rings are not expensive
Mounting on the hood is likely not going to work. 1) the standard hood is petal shaped, so you will have open corners for light to fall on
the backside of the filter for reflections that might interfere. 2) the filter will probably be much further away from the lens front,
which will probably lead to hard vignetting on a UWA lens.
If the Hoya CPL is broken, I would discard it. It might work ok in some situations, but as soon as you have strong light reflections falling on the broken edges, you get all kinds
of reflections. There was recently an article about this on dpreview, how various things on the front lens affect IQ.
The way to do it is to use a step-up ring from 67 to 77, then you can mount the 77mm just fine. These rings are not expensive
Mounting on the hood is likely not going to work. 1) the standard hood is petal shaped, so you will have open corners for light to fall on
the backside of the filter for reflections that might interfere. 2) the filter will probably be much further away from the lens front,
which will probably lead to hard vignetting on a UWA lens.
If the Hoya CPL is broken, I would discard it. It might work ok in some situations, but as soon as you have strong light reflections falling on the broken edges, you get all kinds
of reflections. There was recently an article about this on dpreview, how various things on the front lens affect IQ.