Originally Posted by HDNitehawk
Indeed. See, Alan was right! Instead of stating this:
<div>Originally Posted by neuroanatomist
...maybe I should have stated this:
- Looking at your list of lenses, you'd be fine with either the SpyderLensCal or the LensAlign Pro when testing at the recommended distances.
</div>Originally Posted by HDNitehawk
Depends on what you mean by average. I'd say that if you have a crop body you would never need the long ruler (at the same distance, a crop body has thinner DoF than FF). But someone with a 5DII and a 400mm f/5.6 lens (which includes the 100-400mm) would benefit from the long ruler - those are 'marginal' with the standard ruler.
I just hope there are no Rabbit Lovers on this forum... [:P]