with a step down ring, would if vignette more or less then a 55mm fisheye adapter lens attached to the 55mm filter size. (using a 18-70mm lens as the base lens for attaching)
Ok.. first lets get terms correct. Both you and Kevin K are incorrect, (backwards). The rings are called step up or step down as relates from the LENS TO THE FILTER SIZE. ALWAYS. So in other words, a STEP UP ring means the ring has threads to fit the 55 mm lens and expands with threads to fit the 72mm filter... it STEPS UP the size. Step down is just the opposite. The ring would have, for instance, threads that allow it to fit on a 72mm lens thread, but then STEPS DOWN to allow a 55mm filter to fit on the ring.
Now that we have that straight, you will seldom, if ever, have any kind of vignette problem when you are using a STEP UP ring, meaning you are using a ring that allows you to use a filter LARGER than the thread size of your lens. So no, you are likely not going to have a vignette problem using the 72mm fisheye with the step up ring on your 55mm thread lens.
Most fisheye converter filters are not of the greatest optical design, so whether or not a 55mm fisheye converter "lens' would vignette on your lens with 55mm threads is not something I can know, but I will say it would be more LIKELY too as compared to using the much larger fisheye with the 55 - 72 step UP ring.
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