Yelvertoft, thank you for the welcome; likewise Robski, and thank you for the info.
I use 6x7 film (what do you mean, “what’s that?”) and considering a decent telephoto. However, I need to translate your info into my format. Hence the interest.
As a minimum I will need to get a 400mm plus a 1.4 converter to give 560mm. In 6x7 terms, this will equate to about 280mm. Maybe that’s not enough. Looks like I will need to reconsider.
2x converter? Depends on the quality.
Grant.
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