I am considering purchasing two sets of Lee 4x6 graduated neutral density filters. One set is hard edged with 0.3, 0.6, and 0.9 filters, and the other set is the same except it is soft edge.
My question is how do I use them with slow lenses that are rather dim to begin with? I do not believe you could easily see the transitional line of the GND filters.
Here is what I am thinking of doing. You are more than welcome to comment on the feasibility of my approach. I will start with a clear piece of 4x6 plexiglass. I will scratch and ink in a line mid way though the 6” dimension of the plexiglass. The line itself will be 4” long. I can then insert the 4x6 plexiglass into my Lee filter holder and position the scratched line on the plexiglass along the horizon where I want the transitional line of the GND filter to be as I look through the back of the camera on the ground glass.
From the front of the camera, I will then insert the GND filter behind the plexiglass and position the transitional line of the GND filter to coincide with the scratch line on the plexiglass. Once this is done, I will remove the plexiglass and the GND filter will be properly positioned.
Clearly there will be some guessing of where the transitional line of the GND lies. There is also a possibility I may not even be able to see the scratch line on the plexiglass when looking through the back of the camera on the ground glass. If that should happen I could cover the upper half of the 4x6 plexiglass with black tape to further help me position the plexiglass along the horizon.
Any comments or alternative methods would be appreciated.
Thanks.
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