I did a search on the subject, went through the search findings, but am unable to find an answer to my question (please see subject line). Will the experts/actual users of this item give the SIMPLE answer, please. This finder is described in a well-known site (Google search), and there are numerous listings on the big auction site (most listings describe the condition as hazy, etc.). From what I can understand, this finder is recommended when using a lens (alone), or lens + shade, and the viewfinder is partially blocked by the size of the lens, or the lens + shade. Is this correct? I would assume that this finder can be used even if there is no blockage. Is this also correct? Please also give any actual experience with this finder VIOOH. Please add any actual experience with a companion attachment TUVOO for 2.8cm lens to this finder VIOOH. Is it worth buying VIOOH and using it. I assume one would also buy TUVOO if the 2.8cm lens is used. Please note that there are already threads in this forum about use/handling this finder, making corrections for parallax, different versions (lyre shaped, straight sides) of this finder - even a New York version given the name IMARECT, etc. Thank you all very much, and best regards.