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tadwil

PK to E mount adapter with diaphragm control?

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Does such a beast exist?  I mostly have legacy PK mount lenses for which there are lots of adapters available (and have) but I do have a few modern PK AF lenses without aperture rings that I would like to try with the A7II.  Any links or pictures of the adapter would be much appreciated.

Thanks,

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Follow-up: There seems to be quite a few brands of these type of adapter after all.  I searched for DA to NEX adapter and quite a few of them popped up in eBay.  The same search in Amazon.ca led to this: https://www.amazon.ca/gp/product/B078HJ5JS9/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Although the better priced adapters are available on eBay I chose Amazon for their much quicker turn around time.  I just hope the adapter works as it should.

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40 minutes ago, tadwil said:

I just hope the adapter works as it should.

Did you see bullet point #4 in your above link? (Highlights by myself)

Quote
  • There are no electrical contacts in the adapter ring. Autofocus, automatic aperture and AE metering will be DISABLED. Exposure and focus has to be adjusted manually.

 

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29 minutes ago, Chrissie said:

Did you see bullet point #4 in your above link? (Highlights by myself)

 

Of course, shooting with legacy adapted lenses means aperture priority or manual.  That's just par for the course when one shoots with Pentax cameras and lenses from as far back as sixty plus years.  What these DA to NEX adapter (hopefully) allows me to do is to manually open and close the diaphragm on the current Pentax DA lenses without aperture rings.  If the adapter I just purchased can do that without being to fiddly, I would be happy enough.

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On 7/3/2020 at 11:36 PM, Pieter said:

How do you expect that would work without any communication between camera and lens? For that you need electronic contacts on the adapter.

Whoa, now that makes me feel real old - talk about technological generation gap!😀 

In the Menu: 4th page under the 2nd Tab, enable "Release w/o Lens".  This will let you trip the shutter without any lens in front of your camera.  When I mount any of my legacy lenses to the A7II (along with an appropriate contact-less adapter), the camera acts as if there is no lens mounted.  Even so, I can still manually focus and adjust the aperture range with the focus and aperture rings on the lens.  Every DSLR and MILC bodies will automatically adjust the exposure settings when the diaphragm opens or closes (Aperture Priority mode).  Whether this is done manually by turning the aperture ring on the lens (myself) or by turning the front dial (default setting) on the camera to electronically set the aperture opening via the contacts on your native lenses (you), the camera does it's best to set the appropriate exposure setting.

For sure, it's a lot more convenient to shoot with native lenses but other than the lack of Auto-Focus, shooting with legacy lenses without contacts has a certain charm and rewards.  In fact, I probably will not invest in any Sony FE lenses other than the 28-70 kit lens that came with the camera.

 

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I know how to use manual (non-communicating) lenses, I have one which I enjoy using on occasion. I was just referring to this phrase:

On 7/4/2020 at 7:47 AM, tadwil said:

What these DA to NEX adapter (hopefully) allows me to do is to manually open and close the diaphragm on the current Pentax DA lenses without aperture rings.

Since you say these lenses have no aperture ring, I assume you should adjust the aperture by turning the aperture dial in-camera. For that to work, you need your camera to communicate with the lens. These adapters have no electronic contacts and therefore do not facilitate camera-lens communication. Hence my question:

On 7/4/2020 at 8:36 AM, Pieter said:

How do you expect that would work

 

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Unlike Sony, Canon, Nikon or any of the other mainstream brands that went 100% electronic connections to control everything, Pentax retained the mechanical control over the aperture settings to this day.  It never occurred to me to look for a DA to NEX adapter until I saw a picture of a DA to Fujifilm X-mount adapter at another forum.  The Haoge adapter I bought from Amazon has a zebra ring around the adapter body which should move the lever inside the adapter side to side.  Which in turn would push the aperture control linkage on the lens to open and close the diaphragm. 

I am wondering whether a DA lens aperture would click into place at every 1/3 or 1/2 stop or will it be like a cine lens without clicks - probably the latter.

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