Relay lenses vs. telecompressors/extenders.

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Enginel Contributing Member • Posts: 862
Relay lenses vs. telecompressors/extenders.

Rear mounted contervers have some limitations.
Some people want to use teleconverters with some lenses with do not have empty space reversed into their rear, but it's not possible for MILC or with SLRs, non-protruding TCs have lower quality and typically are only available from cheap 3rd parties.
Or, suppose if one has R Pi camera or Pentax Q and wishes to use lenses from larger sensor cameras with it. Brian Caldwell has designed 0.5x for FF SLR->pentax q  a bit tighter than usual 0.71x for aps-c cameras but that's it. Such design cannot give us much more compression (maybe exotic materials aside).
A drawback that relay system would invert image, which'd complicate framing, however for EVF axes could be inverted in software.
Relay lens even might have option to modify bokeh of resulting system.

What would be relay telecompressors/extenders be like?
I'd guess main drawback would be size?

 Enginel's gear list:Enginel's gear list
Pentax Q Sony Alpha NEX-5N Sony E 18-55mm F3.5-5.6 OSS Sony E 50mm F1.8 OSS
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