NOTE: You will find the YouTube video version of Using Contrast Filters with Polaroid SX-70 Black and White Film at the end of this post.
Polaroid recently introduced the Now+ camera, a box-style camera based on the original OneStep design but with one unique feature: using the Polaroid app, which can be freely downloaded for both iOS and Android devices, the camera’s shutter speeds and apertures can be manually controlled. As a user of MiNT’s SLR670-S camera, which is the only other Polaroid camera to offer manual controls, I was curious to test out the Now+. In fact, I was more than curious; I was hopeful that the Now+ would offer a feature missing in my MiNT camera: the ability to set shutter speeds and apertures at ½ or ⅓ EV settings.
Note: There is a video version of Using the Zone System with Polaroid SX-70 Film, Part 1 at the bottom of this post.
It would be nice to adjust exposures in ½ EV increments with my MiNT SLR670-S camera. Unfortunately, the camera can only make full shutter speed adjustments, one EV at a time; there is no ability to select in-between speeds. While most manually-controlled cameras allow f-stops to be set in half or third stop increments, the original SX-70 cameras that MiNT refurbishes have a ‘fixed’ f/8 aperture.
All too often, I will take a meter reading only to find that the best exposure lies between two shutter speeds, for example between 1/125s and 1/250s at f/8. Because I can’t change the aperture, I’m forced to choose the lower shutter speed, which will result in a slight over-exposure, or the higher shutter speed, which might be darker than I wanted.
Because I’m shooting Polaroid SX-70 integral film, which has a very limited latitude, especially in the highlights, these seemingly minor compromises in exposure can have a major impact on the quality of the final photograph.