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02-02-2016, 01:16 PM   #1
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Rolleiflex 600X lenses on 645D/Z

Dear all,
As far as I am aware, there is no adpter for the Rolleoflex 600x lenses to Pentax 645. The flange distance is no issue.

There are Fotodiox adapters for these lenses to Canon/Nikon/Sony, but whereas the weight of these lenses make them a mismatch for these cameras, they would be useful on the 645 and their weight would not be that out of sync. Many of these lenses have excellent quality. Even though the built-in shutter and auto-diaphragm cannot be used, the Fotodiox adapter to these FF cameras has a diaphragma to make up for this.

Would there be a market for such an adapter? Would it make sense to ask Fotodiox?

Note: I do not yet have a 645D/Z, but I do have a 645-A 35mm, and Rolleiflex 6008 50mm, 80mm and 150mm.

02-02-2016, 02:48 PM   #2
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Pentax to Rollei adapter


Pentax to Rollei adapter
02-02-2016, 03:53 PM   #3
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QuoteOriginally posted by CANYON Quote
Pentax to Rollei adapter


Pentax to Rollei adapter
OP is looking for Rollei to Pentax...
02-02-2016, 07:13 PM   #4
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QuoteOriginally posted by Smolk Quote
Would it make sense to ask Fotodiox?
Try SRS Griturn.
They are often willing to make items like adaptors to order.
Here's their contact form - tell them what you need:

Contact us | SRB-Photographic.co.uk

02-02-2016, 09:24 PM   #5
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might be worth trying this guy as well

https://www.facebook.com/PalecwnosieCameraWorks

he's making me a contax 80/2 for 645z
02-02-2016, 11:11 PM   #6
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QuoteOriginally posted by gavincato Quote
he's making me a contax 80/2 for 645z
Not related to thread but I like to see pictures from that combo!

---------- Post added 02-03-16 at 01:16 AM ----------

@Smolk
You may contact this guy through ebay. Check this link for ended listing and contact him: Rollei 6000 Lens for Mamiya 645 Pentax 645 Remount | eBay

Good luck.

Last edited by RAART; 02-02-2016 at 11:17 PM.
02-03-2016, 08:29 AM   #7
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I don't have much experience with the big Rolleis, but if I'm not mistaken, the 6xxx series lenses have electrically operated apertures - like the Canon EF mount.
So without electronic control of that aperture motor, you can't operate the lens opening, even if adapted to a 645Z.
Looking over that Rollei to Canon adapter, it uses an outboard manually-operated aperture, since the one in the lens is stuck open.
Not only is that less than optically ideal - but I'm guessing there'd be no room for it in a Rollei-Pentax 645 adapter.

Great lenses, but ....
02-04-2016, 01:59 PM   #8
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Ah, thanks for the useful replies. I may follow this up - I like my Rollei glass - but perhaps I should also ask Fotodiox, who after all already make the Rollei side of th adapter - just not yet Pentax 645.

02-08-2016, 03:43 PM   #9
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QuoteOriginally posted by Ontarian50 Quote
I don't have much experience with the big Rolleis, but if I'm not mistaken, the 6xxx series lenses have electrically operated apertures - like the Canon EF mount.
So without electronic control of that aperture motor, you can't operate the lens opening, even if adapted to a 645Z.
Looking over that Rollei to Canon adapter, it uses an outboard manually-operated aperture, since the one in the lens is stuck open.
Not only is that less than optically ideal - but I'm guessing there'd be no room for it in a Rollei-Pentax 645 adapter.

Great lenses, but ....
Why less than optically ideal? But you might be right about the flange, it's 74.00 mm for Rollei vs 70.87 mm for Pentax 645, so that would be quite the challenge!
02-09-2016, 09:03 AM   #10
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QuoteOriginally posted by Smolk Quote
Why less than optically ideal?
Ideally apertures should be right at the optical centre of a lens, so when you stop them down you get a uniform dimming of the image, not just darkening the edges and brighter in the middle.

Those adapters that use an outboard aperture to replace the inoperative electric aperture in the Rollei lens are putting that aperture in a less than "optically ideal" location. On some lenses they may work well enough. But on others you may have merely an adjustable vignetting tool.

That oddly placed aperture might also have a weird effect on bokeh as well.
02-09-2016, 10:01 AM   #11
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Thanks for the clarification. I wonder whether the lenses with an aperture ring (pre-AFD lenses) could have the aperture ring switched on manually. They function like automatic aperture lenses now.
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