Pentax power zoom lenses?

Started Jan 29, 2010 | Discussions
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MusicDoctorDJ Forum Pro • Posts: 12,400
Pentax power zoom lenses?

I was asked a question at the store today about Pentax power zoom lenses and if they would work on a Pentax DSLR.

I know that Minolta tried them in the early days of auto focus, but have never heard of any Pentax lenses with power zoom.

Anyone here know anything about them, if they are indeed out there somewhere?

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J. D.
Colorado

brandrx Forum Pro • Posts: 28,337
Re: Pentax power zoom lenses?

MusicDoctorDJ wrote:

I was asked a question at the store today about Pentax power zoom lenses and if they would work on a Pentax DSLR.

I know that Minolta tried them in the early days of auto focus, but have never heard of any Pentax lenses with power zoom.

Anyone here know anything about them, if they are indeed out there somewhere?

The Pentax FA*80-200mm f2.8 that I have is a Power Zoom (PZ) lens. All I know about this PZ lens is that it (the PZ) doesn't work on any of my DSLR's. K10D, K20D, K2000, K-x, or K-7. Otherwise the FA*80-200mm f2.8 lens is one of the best I've ever used.
http://www.bdimitrov.de/kmp/lenses/zooms/long/FA80-200f2.8.html

I seem to remember someone talking about another PZ lens. Perhaps in the 28-105mm range...or something like that.

Cheers.

-- hide signature --

Ron - 'We don't have time to go take pics this afternoon Carl.'
Carl - 'What do you mean? It will only take 1/1000s.'

'Keep your eyes looking forward. However, glance back now and then to see where you've come from. It will put a smile on your face.' ~ brandrx

Ron ~ Retired.

robert james Regular Member • Posts: 268
Re: Pentax power zoom lenses DO work on K20D, K7

Four major Pentax power zoom lenses:
80-200/2.8 (beyond awesome)
28-105/4-5.6 (excellent)
28-80 (avoid)
28-70/2.8 (excellent)

ALL work, in terms of zooming in and out via the motor, with my K20D. FOR SURE.
I assume they also work on the k7, but not the k-x.

Ryhfeed New Member • Posts: 20
Re: Pentax power zoom lenses DO work on K20D, K7

All power zoom lenses from pentax: FA28-80, FA 28-105, FA70-200, FA80-200, FA 100-300, FA 250-600 (yummy...) work fine on my K10D, K20D & K7. IF they ar not working on a pentax camera with SDM contacts either the lens or the camera is faulty.

Good Luck! / T

Ryhfeed New Member • Posts: 20
Re: Pentax power zoom lenses DO work on K20D, K7

Ryhfeed wrote:

All power zoom lenses from pentax: FA28-80, FA 28-105, FA70-200, FA80-200, FA 100-300, FA 250-600 (yummy...) work fine on my K10D, K20D & K7. IF they ar not working on a pentax camera with SDM contacts either the lens or the camera is faulty.

Good Luck! / T

Yeah, i forgot the excellent FA 28-70 also works fine.

T

LKeithR Veteran Member • Posts: 4,090
Re: Pentax power zoom lenses?

All Pentax Power Zoom lenses...

-SMC Pentax-FA 28-80mm F3.5-4.7
-SMC Pentax-FA 28-105mm F4-5.6
-SMC Pentax-FA 70-200mm F4-5.6
-SMC Pentax-FA 100-300mm F4.5-5.6
-SMC Pentax-FA* 28-70mm F2.8 AL
-SMC Pentax-FA* 80-200mm F2.8 ED [IF]
-SMC Pentax-FA* 250-600mm F5.6 ED [IF]

The power zoom function on my FA 28-105 and FA* 80-200 works fine on my K20D as well. Remember that you have to slide the zoom ring "forward" to expose the "Power Zoom" marking on the lens and activate the power zoom. I believe in the original configuration the power zoom was meant to track a subject (maintaining FOV?) but I don't think it ever lived up to expectations and certainly that part doesn't work on the K20D...

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Keith...

Look at the picture, not the pixels...
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brandrx Forum Pro • Posts: 28,337
Cleaned the contacts on the lens.

brandrx wrote:

MusicDoctorDJ wrote:

I was asked a question at the store today about Pentax power zoom lenses and if they would work on a Pentax DSLR.

I know that Minolta tried them in the early days of auto focus, but have never heard of any Pentax lenses with power zoom.

Anyone here know anything about them, if they are indeed out there somewhere?

The Pentax FA*80-200mm f2.8 that I have is a Power Zoom (PZ) lens. All I know about this PZ lens is that it (the PZ) doesn't work on any of my DSLR's. K10D, K20D, K2000, K-x, or K-7. Otherwise the FA*80-200mm f2.8 lens is one of the best I've ever used.

I cleaned the power zoom (PZ) contacts on my FA*80-200mm f2.8 and now it (the PZ) works with my K10D, K20D, and K-7. It does not work with my K2000 or the K-x.

Cheers.

-- hide signature --

Ron - 'We don't have time to go take pics this afternoon Carl.'
Carl - 'What do you mean? It will only take 1/1000s.'

'Keep your eyes looking forward. However, glance back now and then to see where you've come from. It will put a smile on your face.' ~ brandrx

Ron ~ Retired.

MusicDoctorDJ OP Forum Pro • Posts: 12,400
Re: Pentax power zoom lenses?

Cool!

Thanks for the info.

They are going to bring the lenses in this weekend and I'll try them on my K10D.

Of course, since Pentax pulled out of the stores last summer, I can't sell them a new Pentax, but at least they'll know how their old lenses will work on a DSLR.

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J. D.
Colorado

KentG Veteran Member • Posts: 4,317
Re: Pentax power zoom lenses?

No that function does not work on any of the more modern Pentax cameras, either film or DSLR. Just the power zooming function.
Kent Gittings

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Joseph Tainter Veteran Member • Posts: 9,269
Re: Pentax power zoom lenses?

Several of the PZ lenses were optically superb. Buy them for that, not for the ability to power zoom. You will soon discover that PZ is just a gimmick that drains your battery. How hard is it to zoom a lens with your hand?

Joe

LKeithR Veteran Member • Posts: 4,090
Re: Pentax power zoom lenses?

Yeah, the FA* 80-200, for example, is a stellar lens but when I got mine I didn't even realize it was a power zoom till after I had played with it a bit. It's an "interesting" feature but I never use it...
--
Keith...

Look at the picture, not the pixels...
http://www.lkeithr.zenfolio.com

headmj Contributing Member • Posts: 592
Re: Pentax power zoom lenses?

I never considered teh power zoom a gimmick. I got my first one with my PZ-1p and have loved the feature since. I wish thay still made it.

Mike

st_martin Forum Member • Posts: 74
Re: Pentax power zoom lenses?

MusicDoctorDJ wrote:

Anyone here know anything about them, if they are indeed out there somewhere?

They are indeed out there. The first cameras I know of that employed it were the Z/PZ series introduced with the KAF2 mount in 1991. There were a number of neat features, but I don't know how well they worked. The most interesting one to me is Image Size Tracking. I almost got run over by a horse in a parade in NW Arkansas one time because I tried to do IST on my all-manual MX. It would have made a great shot (very pretty lady in bright colorful costume riding a beautiful horse), but I was unable to both zoom correctly and focus in time. I noticed the danger I had created by the look of alarm on the pretty lady's face, and jumped out of the horse's path just barely in time. Of course I missed the shot. I saw an interesting use of IST in the movie 'The Graduate'. Hoffman is running up a hill to get to the church to stop his love from marrying someone else. He stays the same size in the image, and the scenery around and behind him rushes away behind him. It looks like he is staying in one place and it is the scenery that is moving.

With the advent of the MZ/ZX series in 1995 all of the functions of PZ except for Power Zooming and Auto Lens Retraction (the lens is automatically zoomed to its shortest physical length when the camera is turned off) were dropped. My MX-S works this way, as do my K10D and K20D. The zoom has two speed levels, which makes it easy to control. It does zoom faster than I can do it by hand. I wish they stll made it, particularly because of IST. I use PZ always on the one lens I own that allows it.

Bojidar has posted detailed information on the Power Zoom feature at
http://www.bdimitrov.de/kmp/technology/K-mount/Kaf2.html

labnut Senior Member • Posts: 1,016
heaven forbid

Power zoom? Heaven forbid!
I have power zoom on the lenses for my Minolta 5xi film camera.
I have never stopped hating this feature.
Nothing can match the immediate direct effectiveness of manual zoom

lime500 Regular Member • Posts: 209
Re: Pentax power zoom lenses?

Gobble gobble gobble. That's what Power Zoom does to your battery. Also makes the lens bulkier and heavier than it would be otherwise.

Quite fun, though. Might be good for video (if using an external mic).

Chau D Senior Member • Posts: 1,294
Re: Pentax power zoom lenses DO work on K20D, K7

How do you "activate" the power zoom on a K20D? I mean what button you need to press?
--
Wil
Damn the Pentax Manual

Lance B Forum Pro • Posts: 29,155
Re: Pentax power zoom lenses DO work on K20D, K7

Chau D wrote:

How do you "activate" the power zoom on a K20D? I mean what button you need to press?

No need to press any button. The power zoom function should work by slightly turning the zoom ring. If it does not work, then you need to move/slide the zoom ring forward/away from the camera so as the words 'Power Zoom' are showing. This will enable the power zoom function only. With the zoom ring toward the camera so as the words 'Power Zoom' are not seen, the zoom ring functions just like a normal zoom, ie you have to move the zoom by hand.

The power zoom has 3 speeds, 'slow', 'medium' and 'fast' zoom speeds. I love the power zoom as it makes it faster and easier to zoom whilst concentrating on the subject matter.

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Wil
Damn the Pentax Manual

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Lance B Forum Pro • Posts: 29,155
Re: Pentax power zoom lenses?

headmj wrote:

I never considered teh power zoom a gimmick. I got my first one with my PZ-1p and have loved the feature since. I wish thay still made it.

I agree wholeheartedly. The power zoom feature makes for very steady zooming without losing your subject matter and focus. Sometimes, when using a manual zoom lens and needing to twist your hand around the lens to zoom, you can sometimes lose your subject matter and focus point. You then sometimes need to refocus and therefore miss valuable seconds. I wish power zoom was a function/option on the modern lenses too.

Mike

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Lance B Forum Pro • Posts: 29,155
Re: Pentax power zoom lenses?

st_martin wrote:

MusicDoctorDJ wrote:

Anyone here know anything about them, if they are indeed out there somewhere?

They are indeed out there. The first cameras I know of that employed it were the Z/PZ series introduced with the KAF2 mount in 1991. There were a number of neat features, but I don't know how well they worked. The most interesting one to me is Image Size Tracking. I almost got run over by a horse in a parade in NW Arkansas one time because I tried to do IST on my all-manual MX. It would have made a great shot (very pretty lady in bright colorful costume riding a beautiful horse), but I was unable to both zoom correctly and focus in time. I noticed the danger I had created by the look of alarm on the pretty lady's face, and jumped out of the horse's path just barely in time. Of course I missed the shot. I saw an interesting use of IST in the movie 'The Graduate'. Hoffman is running up a hill to get to the church to stop his love from marrying someone else. He stays the same size in the image, and the scenery around and behind him rushes away behind him. It looks like he is staying in one place and it is the scenery that is moving.

With the advent of the MZ/ZX series in 1995 all of the functions of PZ except for Power Zooming and Auto Lens Retraction (the lens is automatically zoomed to its shortest physical length when the camera is turned off) were dropped. My MX-S works this way, as do my K10D and K20D. The zoom has two speed levels, which makes it easy to control. It does zoom faster than I can do it by hand. I wish they stll made it, particularly because of IST. I use PZ always on the one lens I own that allows it.

I would love the power zoom feature on the modern lenses, too. I have the FA*80-200 and the FA*28-70 and love the feature.

Bojidar has posted detailed information on the Power Zoom feature at
http://www.bdimitrov.de/kmp/technology/K-mount/Kaf2.html

-- hide signature --
 Lance B's gear list:Lance B's gear list
Nikon D810 Nikon D500 Nikon AF-S Nikkor 16-35mm F4G ED VR Nikon AF-S Nikkor 14-24mm f/2.8G ED Nikon AF-S Nikkor 24-70mm f/2.8G ED +16 more
awaldram
awaldram Forum Pro • Posts: 12,407
Re: Pentax power zoom lenses?

KentG wrote:

No that function does not work on any of the more modern Pentax cameras, either film or DSLR. Just the power zooming function.
Kent Gittings

one PZ feature that does appear to function is auto retract .

i.e when you switch the camera off the lens retracts to its smallest length.

weird how reports seem to indicate its non-functional on the Kx , I thought the features available only required the power supplied from the Pz contacts which would imply it would work on all SDM bodies.
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