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03-27-2021, 12:03 PM   #1
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Sony E mount to Pentax Q adapter

This is a very limited application.
I'm thinking of a focal reduced K telephoto lens to E mount, then adapted to PQ mount.
Anyone ever seen or made / used such a specimen?

03-27-2021, 12:14 PM   #2
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Adapting E-mount lens to Q-mount will not work unless the adapter has electronic control of aperture and focus.
So I doubt they exist.
03-27-2021, 12:53 PM   #3
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Why not go straight from K to Q ?
03-27-2021, 02:22 PM   #4
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QuoteOriginally posted by DonV Quote
Why not go straight from K to Q ?
Probably because there is no K to Q focal reducer.

03-27-2021, 02:25 PM   #5
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QuoteOriginally posted by Fogel70 Quote
Adapting E-mount lens to Q-mount will not work unless the adapter has electronic control of aperture and focus.
So I doubt they exist.
Only if adapting an electronic E mount lens. But the OP wants to use a K to E focal reducer, manual control of the K mount lens on E mount?
03-27-2021, 06:48 PM   #6
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QuoteOriginally posted by boriscleto Quote
Only if adapting an electronic E mount lens. But the OP wants to use a K to E focal reducer, manual control of the K mount lens on E mount?
Sure. But I suspect the e to q would need to be 3D printed. There’s not normally any reason to do it so adapters are unlikely to exist.
03-27-2021, 08:01 PM   #7
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QuoteOriginally posted by boriscleto Quote
Only if adapting an electronic E mount lens. But the OP wants to use a K to E focal reducer, manual control of the K mount lens on E mount?
Yes, that's it. I know of the mythical Metabones PK-Q 666 adapter, so this is the same idea except with a regular reducer to E mount.

What about adapting E mount to C, then to Q ?

03-27-2021, 08:07 PM   #8
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I'm either dense or confused- and maybe both!
I thought the object was to use a "K" mount lens on a "Q".
Why go to an "E" at all? Why would a "focal reduced" K lens be needed?
Manual adapters are available for K to Q and don't require any glass, as the focus distance of the K is longer than a Q lens.

Please explain a little more.
03-28-2021, 06:21 AM   #9
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I've seen good results with the focal reducer on Sony E.
The benefits: a lil sharper, a lil brighter with super tele lenses.

I'd like to see the same benefits on the Q, esp with mirror lenses.
Since it's the center sweet spot, should work well.

Further, I want to get a better idea of what the aforementioned PK->Q 666 speedbooster could do potentially for me w/o spending $500.
BTW, anybody get this one yet?
https://www.bhphotovideo.com/c/product/1462383-REG/metabones_mbsppk_q_bm1_pe...981&
03-28-2021, 02:09 PM   #10
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I just spent an hour or more reading older threads about these " focal reducers ". I still find it curious that more glass is supposed to make images sharper; however, the brightness increase does "happen"- but not at theoretical "boosts".

The accompanying reduction of apparent focal length, would reduce the effect of a Super tele- making it a "less super" one; but the brightness gain would be nice to have.

I'm with you, kayakfari, I'd like to "see" what I was getting for around $500 ! That $$ buys a pretty good lens or camera or both.

I'm left with a final thought/idea - if speedboosters are so good- why are they not incorporated into the original lens design? Or is it that there is no "free lunch" ?
05-31-2021, 02:21 AM   #11
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Hmm, any focal reducer could be interesting additions for adaptors to hook up with a Q. Canon EF lens to MFT turbo speed boosters are common.
06-01-2021, 06:24 AM   #12
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QuoteOriginally posted by DonV Quote

I'm with you, kayakfari, I'd like to "see" what I was getting for around $500 ! That $$ buys a pretty good lens or camera or both.

I'm left with a final thought/idea - if speedboosters are so good- why are they not incorporated into the original lens design? Or is it that there is no "free lunch" ?
Two issues:
Cost - adding $500 to every lens is expensive.
Size - your lenses would need to be created for a larger frame size and a longer focal length than you actually need.
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