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Probably close enough.
Using the 140mm fl. So if that if it were placed 56mm inside the "new" focus for a further reduction of x0.7 the back focus would be 40mm.
This means that the distance between the reducers would be (175-56 = 119mm) and the final focus would be 40mm behind the second recucer.
I have a spreadsheet I use Reducers V2.
When you insert the focal length of the reducer it gives you all the answers!!
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