Rolleiflex 600X lenses on 645D/Z

Smolk · 02-02-2016, 01:16 PM

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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.

CANYON · 02-02-2016, 02:48 PM

Pentax to Rollei adapter

Pentax to Rollei adapter

itshimitis · 02-02-2016, 03:53 PM

Originally posted by CANYON

Pentax to Rollei adapter

Pentax to Rollei adapter

OP is looking for Rollei to Pentax...

lytrytyr · 02-02-2016, 07:13 PM

Originally posted by Smolk

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

gavincato · 02-02-2016, 09:24 PM

might be worth trying this guy as well

https://www.facebook.com/PalecwnosieCameraWorks

he's making me a contax 80/2 for 645z

RAART · 02-02-2016, 11:11 PM

Originally posted by gavincato

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.

Ontarian50 · 02-03-2016, 08:29 AM

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 ....

Smolk · 02-04-2016, 01:59 PM

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.

Smolk · 02-08-2016, 03:43 PM

Originally posted by Ontarian50

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!

Ontarian50 · 02-09-2016, 09:03 AM

Originally posted by Smolk

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.

Smolk · 02-09-2016, 10:01 AM

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.

02-02-2016, 01:16 PM	#1
Smolk Pentaxian Join Date: Feb 2010 Location: Eerbeek Photos: Gallery \| Albums Posts: 1,857	Rolleiflex 600X lenses on 645D/Z Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. 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, 11:11 PM	#6
RAART Veteran Member Join Date: Apr 2013 Location: Oakville, ON Photos: Gallery Posts: 1,095	Originally posted by gavincato 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.

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02-02-2016, 03:53 PM	#3
itshimitis Pentaxian Join Date: May 2011 Location: All over the place Posts: 3,535	Originally posted by CANYON Pentax to Rollei adapter Pentax to Rollei adapter OP is looking for Rollei to Pentax...

02-02-2016, 07:13 PM	#4
lytrytyr Pentaxian Join Date: Nov 2011 Photos: Gallery \| Albums Posts: 4,310	Originally posted by Smolk 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
gavincato Senior Member Join Date: Apr 2015 Location: NSW, Australia Posts: 247	might be worth trying this guy as well https://www.facebook.com/PalecwnosieCameraWorks he's making me a contax 80/2 for 645z

02-03-2016, 08:29 AM	#7
Ontarian50 Veteran Member Join Date: Mar 2015 Posts: 530	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
Smolk Pentaxian Join Date: Feb 2010 Location: Eerbeek Photos: Gallery \| Albums Posts: 1,857 Original Poster	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
Smolk Pentaxian Join Date: Feb 2010 Location: Eerbeek Photos: Gallery \| Albums Posts: 1,857 Original Poster	Originally posted by Ontarian50 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
Ontarian50 Veteran Member Join Date: Mar 2015 Posts: 530	Originally posted by Smolk 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
Smolk Pentaxian Join Date: Feb 2010 Location: Eerbeek Photos: Gallery \| Albums Posts: 1,857 Original Poster	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.