Can you help me understand the pros & cons of a 1:1 viewfinder? On the surface it seems that 1:1 is the best option? For example the CV R3M has a 1:1 VF with 40mm as the widest frameline and the R2M is .7 with 35 as the wide FL. Advantages/disadvantages of each??? What are some of the other view angles from different cameras?