Kodachrome25
16-Oct-2012, 11:22
I am using an Aristo V54 D2-Hi Cold Light head on my 45MX with a RH Designs Stop Clock Vario. I have been doing 35mm and 6x6 without issue for some time using under lens Ilford Multigrade filters.
But last night, I did my first 16x20 from a 4x5 neg in a glass holder and got noticeable falloff on the sides and corners, as much as half a stop. I had the lamp lowered all the way down to where it was touching the top of the glass and used my 150mm 5.6 Rodagon versus my 135, so I thought I was golden in terms of adequate coverage and even illumination, lens was at F/16. It is gradual from about the outer 20% of the image, could use about 1-2 more seconds on a 14 second exposure than the rest of the shot. I might try out adding a spare diffuser I have unless it is thought that it is the lens versus the light source. I am going to need to use my 135 in order to get to 20x24 on the baseboard, so I feel like nipping this on the light source end if I can swing it...
Is this the solution or am I facing another issue I am not identifying yet?
But last night, I did my first 16x20 from a 4x5 neg in a glass holder and got noticeable falloff on the sides and corners, as much as half a stop. I had the lamp lowered all the way down to where it was touching the top of the glass and used my 150mm 5.6 Rodagon versus my 135, so I thought I was golden in terms of adequate coverage and even illumination, lens was at F/16. It is gradual from about the outer 20% of the image, could use about 1-2 more seconds on a 14 second exposure than the rest of the shot. I might try out adding a spare diffuser I have unless it is thought that it is the lens versus the light source. I am going to need to use my 135 in order to get to 20x24 on the baseboard, so I feel like nipping this on the light source end if I can swing it...
Is this the solution or am I facing another issue I am not identifying yet?