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05-04-2021, 09:22 AM   #1
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Pentax K mount duplicators any good?

Thinking about going this route. Should work with my DA 50mm f2.8. Spiratone also made an duplicator that was k mount compatible with an adapter.



05-04-2021, 12:03 PM   #2
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You probably need a lens with an aperture ring, I doubt you find a duplicator with a modern K mount.
05-04-2021, 01:37 PM   #3
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you can still buy them new
Buy PENTAX Film Duplicator (with Mount Holder 24x36), for ?999.00! | Ricoh Imaging EU
Pentax Film Duplicator 30100 | C.R. Kennedy
not sure about US

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05-04-2021, 07:10 PM   #4
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Do you mean the slide holder? This is similar to the Spiratone slide duplicators. Be aware these are for full frame cameras so you won't get full frame coverage with a APS-C body without some modification.

PENTAX Slide Holder 1x, K reviews - Pentax Camera Accessory Review Database

05-04-2021, 07:31 PM   #5
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QuoteOriginally posted by Not a Number Quote
Do you mean the slide holder? This is similar to the Spiratone slide duplicators. Be aware these are for full frame cameras so you won't get full frame coverage with a APS-C body without some modification.

PENTAX Slide Holder 1x, K reviews - Pentax Camera Accessory Review Database
Right I'm wondering what mods are required and whether it's worth the effort. Looks like you answered my question. Thanks.

So according to that review, a Pentax A 50mm 2.8 with .5x magnification fills half the screen. I'm be using the FA 50mm 2.8 with 1:1 magnification. Any reason this device wouldn't work straight out of the box? Seems it's within focusing range of the lens.

Last edited by jimmypage; 05-04-2021 at 07:40 PM.
05-04-2021, 07:51 PM   #6
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The problem is as you decrease magnification you need to move the object (slide/negative) further away from the lens. The duplicators were designed for 1:1 magnification or greater to allow limited cropping. They weren't designed for less than 1 or at least not enough to get full frame coverage on a crop body..
05-05-2021, 11:18 AM   #7
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Spiratone is a slide duplicating unit for 35mm (full frame) ; it will work in the K1 but not on the APSC cameras
I own one and the minimum magnification you can get is 1x and for APSC you need ~0.6

I guess you mean something like this one?
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05-06-2021, 10:38 AM   #8
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QuoteOriginally posted by Not a Number Quote
The problem is as you decrease magnification you need to move the object (slide/negative) further away from the lens. The duplicators were designed for 1:1 magnification or greater to allow limited cropping. They weren't designed for less than 1 or at least not enough to get full frame coverage on a crop body..
This...^ ^ ^

Even using bellows, reproduction less than 1:1 is a problem when doing film copy work. My Pentax Bellows K is able to manage FF negative to APS-C sensor, but probably not 6x6cm to APS-C or even FF.


Steve

05-08-2021, 06:04 PM   #9
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You CAN do a digitize a complete 24X36mm slide or negative with Pentax APS-C cameras. It is finicky to set up, but once you set up it up, it works just fine.

I figured it out 9 years ago with a little help using a K-r. and I've done it with my K-3 (MUCH better results) and I tweaked my setup a bit over time. Here is the link to my Pentax Forum post rom 2012:
how to - auto bellows slide copier K & dSLR

For what it is worth... one of the myriad reasons I recently purchased a K-1 was slide duplication should be less finicky to setup with a 1:1 image to sensor ratio. And I hear pixel shift makes a big difference also.
6 Days Ago   #10
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QuoteOriginally posted by jimmypage Quote
Spiratone also made an duplicator that was k mount compatible with an adapter.
Just about every slide duplicator I have ever seen, apart from those made by camera manufaturers themselves, use a T-mount - a screw mount which is (dangerously) almost identical to the old Pentax/Practica M42 mount but is not . So you then use a T-mount adaptor between the duplicator and your camera, such as this one. I expect that is what Spiratone use :

Quality T2 / T-mount Lens to PENTAX K / PK Camera Mount Adapter (fits K range) | eBay
5 Days Ago   #11
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Getting the bellows to 0.67x (36x24 -> 24x16 )magnification is tricky but can be done; depending on the minimum extension of your bellows
Learn super macro photography cheaply using extension tubes

For 6x6 you'll need to get rid of the bellows and use a macro lens to ~0.4x (24mm/60mm) directly on camera
The 50 macro gets to 0.5x (1:2) so it should work fine without bellows in a copy stand
For me the biggest issue has been stray light, and ended up making a "pyramid" of black paper around the setup to keep light away



QuoteOriginally posted by stevebrot Quote
This...^ ^ ^

Even using bellows, reproduction less than 1:1 is a problem when doing film copy work. My Pentax Bellows K is able to manage FF negative to APS-C sensor, but probably not 6x6cm to APS-C or even FF.


Steve
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