Jump to content

PK to E mount adapter with diaphragm control?


tadwil
 Share

Recommended Posts

Advertisement (gone after registration)

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,

Link to post
Share on other sites

  • 2 weeks later...

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.

Link to post
Share on other sites

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.

 

Link to post
Share on other sites

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.

Link to post
Share on other sites

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.

 

Link to post
Share on other sites

Advertisement (gone after registration)

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

 

Link to post
Share on other sites

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.

Link to post
Share on other sites

  • 3 months later...

It may be of interest to hear an AF adapter has recently been announced for Pentax lenses (which will also control apertures)

https://www.sonyalpharumors.com/this-is-the-prototype-of-thw-worlds-first-monsteradapter-la-ke1-pentax-k-mount-to-sony-e-mount-autofocus-adapter/

I heard about it just after receiving my DA-Nex adapter (which has fairly limited movement compared to aperture rings, and no click stops at all) I don't think the movement directly correlates to f-stop, just progressively closing the aperture over the course of ~20mm movement.

FWIW though most of my DA lenses only cover slightly more than APSC at most focal lengths, I found the DA55-300 covers FF throughout it's range. This will be VERY useful if I can get AF with it! Just have to wait till the monster adapters released :)

Edited by petrochemist
Link to post
Share on other sites

  • 1 month later...
  • 9 months later...
On 12/6/2020 at 2:23 AM, Koenr said:

This adapter has clicks (7 in total). I am using it on my A7II and A6000 and am very satisfied with it. https://www.kentfaith.com/KF06.310_pentax-k-m-a-fa-da-lenses-to-sony-e-mount-pk-da-e-adapter

 

 

What does each of those 7 clicks represent, do you get full stop's worth of reduction in the shutter speed per click as the diaphragm closes down?

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

  • Posts

    • Also consider the new A7iv. It has a lot of the A9ii except the 20 fps silent shutter. If you really value that, get the A9ii. Otherwise the A7iv may be just as nice for half the price.
    • Hi everyone, I’ve been using my A7iii for about 3 years now and overall I’m pretty happy with it. I find myself wanting to upgrade to a newer model namely for: a better menu, EVF, ergonomics and better auto focusing. I don’t have a set budget, I want to buy the right camera for my needs. The type of photography I primarily do is travel/documentary. Video is nice to have but not that important to me. I shoot some landscapes but this isn’t my primary focus. Occasionally I will crop but that isn’t very often. A fast shutter speed is nice to have in some of the environments I shot in. Low light performance is very important to me along with eye auto focus. Obviously everyone is lusting after the A1 right now and I have to admit, I’m tempted. For my uses I think 50 megapixels is too much. I however I’m not entirely sure as I’ve never used a high megapixel camera. The camera that seems to check all of the boxes is the A9ii.    I may have answered my own question but I’m interested to hear everyone’s opinion.    Thanks
    • I paired a JJC BTR-S1 remote with my Sony A1. I want to unpair it but can't figure can't how to do that. Can someone help me? TIA.
  • Topics

×
×
  • Create New...