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04-30-2016, 04:16 PM   #1
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Any reason why DFA lenses still use an aperture lever?

Just sitting here looking at my lenses and wondering why the newest 645 lenses still use an aperture lever. The A and FA lenses do, sure I get that as they come from another era.

This is obviously the limiting reason why we can't adapt these lenses to a K-1.

Are the new 645 zooms on the roadmap likely to have a lever also, probably so.

04-30-2016, 04:34 PM   #2
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Isn't the real problem the lack of aperture ring on (some of) these lenses? Well, I guess if the aperture would be completely digitally controlled, there could be some more communication, even through a (genuine) adapter.
04-30-2016, 04:45 PM   #3
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That's the point really, 1980's tech in 2016.
04-30-2016, 06:06 PM   #4
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Perhaps because they are Pentax 645 mount the same as the camera?


Steve

04-30-2016, 06:09 PM   #5
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Maybe Hoya then Ricoh, think the r&d for this is not worth at this point, while it could be easy for us to just ask for it, maybe is a software nightmare for the engies, from the easy solution of add instruction of the aperture from the camera and the lens respond in automatic, to, all the software must be rewrite to add this feature....

A dont think is imposible, today lenses dont have the aperture ring, maybe in a few generation the lever will be electronic.
04-30-2016, 06:21 PM   #6
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QuoteOriginally posted by 2351HD Quote
This is obviously the limiting reason why we can't adapt these lenses to a K-1.
Just to be clear, as with the 645Z, no K-mount camera is able to signal in-lens aperture control on any lens, so you would need a little more than a revamp of the lens.


Steve

Last edited by stevebrot; 04-30-2016 at 06:26 PM.
04-30-2016, 06:37 PM   #7
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The aperture lever isn't a problem really, just an old fashioned way of implementing aperture control. Getting rid of it would kill backwards compatibility with older bodies (think Nikon E lenses).

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04-30-2016, 06:42 PM   #8
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QuoteOriginally posted by stevebrot Quote
Just to be clear, as with the 645Z, no K-mount camera is able to signal in-lens aperture control on any lens, so you would need a little more than a revamp of the lens.


Steve
So let's be clear here Steve, you are saying that they just released the biggest camera for them in 15 years and still the K1 has no electronic aperture control? What about the 15-30, 24-70, 70-200, 150-450, are they still mechanical aperture control?

If that's the case then.......wow. I will stop asking then because that's clearly some backwards thinking. Their claim of backwards compatibility with the K1 is standard issue for them then because nothing has changed for 20 years.

I guess that explains why the Novoflex K lens adapters have a ring on them for aperture control. I wonder why we can't have that for 645 lenses on K mount too.

04-30-2016, 06:59 PM   #9
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QuoteOriginally posted by 2351HD Quote
Their claim of backwards compatibility with the K1 is standard issue for them then because nothing has changed for 20 years.
Try '41 years' - lenses going all the way back to 1975 can be used, and the green button gives you fast stop-down metering. ☺

Legacy glass really works.

The lower model Nikons can't even drive the AF on their older lenses, for instance.

Last edited by clackers; 04-30-2016 at 07:04 PM.
04-30-2016, 07:03 PM   #10
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QuoteOriginally posted by 2351HD Quote
So let's be clear here Steve, you are saying that they just released the biggest camera for them in 15 years and still the K1 has no electronic aperture control? What about the 15-30, 24-70, 70-200, 150-450, are they still mechanical aperture control?
Ummm...yes.

As for backward thinking, I do believe that is the intent. The D FA K-mount lenses are backward compatible to all K-mount bodies that support body-controlled aperture. Likewise, I do believe the D FA 645 lenses are backward compatible to the original Pentax 645 film camera, though with the loss of AF on some models having internal focus motors. As with Nikon, Pentax places a high value on both backward and forward compatibility.


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04-30-2016, 07:04 PM   #11
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QuoteOriginally posted by clackers Quote
Try '41 years' - lenses going all the way back to 1975 can be used, and the green button gives you fast stop-down metering. ☺
...and with appropriate M42 adapters, all the way back to the mid-1950s.


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04-30-2016, 07:06 PM   #12
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QuoteOriginally posted by 2351HD Quote
I guess that explains why the Novoflex K lens adapters have a ring on them for aperture control.
Yes, those allow K-mount lenses to be used with full manual aperture on cameras lacking mechanical aperture control.


Steve
04-30-2016, 07:18 PM   #13
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QuoteOriginally posted by clackers Quote
The lower model Nikons can't even drive the AF on their older lenses, for instance.
I don't remember for sure, but don't the upper level Nikon bodies support all AI lenses with all but G-series and E-series FF lenses being backward compatible to the earliest F-mount bodies (1959)? (IIRC, G-series are compatible with all bodies capable of automated aperture control back to the early 1980s).


Steve
04-30-2016, 10:54 PM   #14
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Nikon has mechanical aperture control still ( not to be confused with meter coupling ). So does Sony/Minolta. When Canon changed mounts they changed everything. Pentax probably didn't want to do a lens mount change again.
04-30-2016, 11:58 PM   #15
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QuoteOriginally posted by stevebrot Quote
I don't remember for sure, but don't the upper level Nikon bodies support all AI lenses with all but G-series and E-series FF lenses being backward compatible to the earliest F-mount bodies (1959)? (IIRC, G-series are compatible with all bodies capable of automated aperture control back to the early 1980s).


Steve
There's no screwdrive on the 3000 and 5000 series bodies, AFAIK, Steve.

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