I may be in the market for a fiber optic illuminator for use with 4x5 at magnifications between 1:5 and 5:1 and apertures from f/4 to f/32 at timed indoor exposures between 1/30 and several minutes. I'd like at least two cables and adjustable intensity. Independently adjustable intensity is even better. Is this a realistic set of requirements? I'd like to keep total cost below $100 but if that's unrealistic given the stated requirements then I could spend more. I just don't want to be too extravagant.