FA 28-105 F4-5.6 Lens?

stevewong · 03-15-2015, 06:14 PM

Hello To ALL,
I bought this len use From Keh Camera store in Excellent condition.It has the switch on the body with P and A- AS.I know P is for power Zoom. But what is A stand for ?.
If someone has use it before,please tell me so I don't break it !!!
Thanks,
steven

**Lowell Goudge** · 03-15-2015, 06:25 PM

The lens had several options when used with a PZ1 or similar film body. I forget now all of them. But there was image size tracking, zoom during exposure , and a few other things the lens could do. Download the manual from Ricoh/pentax imaging. On a dslr all you have is power zoom by turning the collar. Pentax promised with the k10 to support the power zoom functions but never did

Adam · 03-15-2015, 06:45 PM

Pentax Lens Power Zoom

stevewong · 03-15-2015, 06:49 PM

Originally posted by Adam

Pentax Lens Power Zoom

Thanks Adam , That is very good link and help very much !!
Thank you,
steven

---------- Post added 03-15-15 at 07:02 PM ----------

Originally posted by Lowell Goudge

The lens had several options when used with a PZ1 or similar film body. I forget now all of them. But there was image size tracking, zoom during exposure , and a few other things the lens could do. Download the manual from Ricoh/pentax imaging. On a dslr all you have is power zoom by turning the collar. Pentax promised with the k10 to support the power zoom functions but never did

Thanks Lowell Goudge for your help. My K-10D Does work with this Len , It moves the Zoom for focus !!. I find it has Back focus very bad with my K-10D.
steven

Marktax · 03-15-2015, 07:35 PM

The best PZ uses (to me) on the PZ-1p were zooming to frame (of course), followed by zoom during longer exposures to give you smooth zoom trails (i.e., not doing it by wobbly hand), and auto retract to shortest length when cutting camera off. On the 28-105, I set zoom clip to 35mm so I could get there quickly at the push of that button. The others fundctions I didn't use that much. K-3 still performs zooming when the zoom ring is set to the power zoom position. In truth, however, that zooming mechanism was optimized to work smoothly, so manual zooming with those old lenses works very nicely too. However, the IQ of the 70-200mm f4-5.6 (the only one I still have) does not fare well with the digital sensors.

stevewong · 03-15-2015, 07:47 PM

Originally posted by Marktax

The best PZ uses (to me) on the PZ-1p were zooming to frame (of course), followed by zoom during longer exposures to give you smooth zoom trails (i.e., not doing it by wobbly hand), and auto retract to shortest length when cutting camera off. On the 28-105, I set zoom clip to 35mm so I could get there quickly at the push of that button. The others fundctions I didn't use that much. K-3 still performs zooming when the zoom ring is set to the power zoom position. In truth, however, that zooming mechanism was optimized to work smoothly, so manual zooming with those old lenses works very nicely too. However, the IQ of the 70-200mm f4-5.6 (the only one I still have) does not fare well with the digital sensors.

Thanks Marktax,
I chose this Len is because of the price and in very good condition. FA 28-105 has three of them.I read the Review most people like the 28-108 F3.2-4.5 For better Colors and F stop !!.
I can not see why it has the different ??
Thank you, for your help !,
steven

Marktax · 03-15-2015, 09:04 PM

Yes, the 28-105 f3.2-4.5 is better because of aspherical lens elements - a completely different optical design. It also came with a hood that would have helped with color, whereas the power zoom had no hood.

03-15-2015, 06:14 PM	#1
stevewong Senior Member Join Date: Jul 2013 Posts: 215	FA 28-105 F4-5.6 Lens? Hello To ALL, I bought this len use From Keh Camera store in Excellent condition.It has the switch on the body with P and A- AS.I know P is for power Zoom. But what is A stand for ?. If someone has use it before,please tell me so I don't break it !!! Thanks, steven

03-15-2015, 06:45 PM	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	Pentax Lens Power Zoom Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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03-15-2015, 06:25 PM	#2
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886	The lens had several options when used with a PZ1 or similar film body. I forget now all of them. But there was image size tracking, zoom during exposure , and a few other things the lens could do. Download the manual from Ricoh/pentax imaging. On a dslr all you have is power zoom by turning the collar. Pentax promised with the k10 to support the power zoom functions but never did

03-15-2015, 06:49 PM	#4
stevewong Senior Member Join Date: Jul 2013 Posts: 215 Original Poster	Originally posted by Adam Pentax Lens Power Zoom Thanks Adam , That is very good link and help very much !! Thank you, steven ---------- Post added 03-15-15 at 07:02 PM ---------- Originally posted by Lowell Goudge The lens had several options when used with a PZ1 or similar film body. I forget now all of them. But there was image size tracking, zoom during exposure , and a few other things the lens could do. Download the manual from Ricoh/pentax imaging. On a dslr all you have is power zoom by turning the collar. Pentax promised with the k10 to support the power zoom functions but never did Thanks Lowell Goudge for your help. My K-10D Does work with this Len , It moves the Zoom for focus !!. I find it has Back focus very bad with my K-10D. steven

03-15-2015, 07:35 PM	#5
Marktax Pentaxian Join Date: Jun 2013 Location: Washington DC Photos: Albums Posts: 610	The best PZ uses (to me) on the PZ-1p were zooming to frame (of course), followed by zoom during longer exposures to give you smooth zoom trails (i.e., not doing it by wobbly hand), and auto retract to shortest length when cutting camera off. On the 28-105, I set zoom clip to 35mm so I could get there quickly at the push of that button. The others fundctions I didn't use that much. K-3 still performs zooming when the zoom ring is set to the power zoom position. In truth, however, that zooming mechanism was optimized to work smoothly, so manual zooming with those old lenses works very nicely too. However, the IQ of the 70-200mm f4-5.6 (the only one I still have) does not fare well with the digital sensors.

03-15-2015, 07:47 PM	#6
stevewong Senior Member Join Date: Jul 2013 Posts: 215 Original Poster	Originally posted by Marktax The best PZ uses (to me) on the PZ-1p were zooming to frame (of course), followed by zoom during longer exposures to give you smooth zoom trails (i.e., not doing it by wobbly hand), and auto retract to shortest length when cutting camera off. On the 28-105, I set zoom clip to 35mm so I could get there quickly at the push of that button. The others fundctions I didn't use that much. K-3 still performs zooming when the zoom ring is set to the power zoom position. In truth, however, that zooming mechanism was optimized to work smoothly, so manual zooming with those old lenses works very nicely too. However, the IQ of the 70-200mm f4-5.6 (the only one I still have) does not fare well with the digital sensors. Thanks Marktax, I chose this Len is because of the price and in very good condition. FA 28-105 has three of them.I read the Review most people like the 28-108 F3.2-4.5 For better Colors and F stop !!. I can not see why it has the different ?? Thank you, for your help !, steven

03-15-2015, 09:04 PM	#7
Marktax Pentaxian Join Date: Jun 2013 Location: Washington DC Photos: Albums Posts: 610	Yes, the 28-105 f3.2-4.5 is better because of aspherical lens elements - a completely different optical design. It also came with a hood that would have helped with color, whereas the power zoom had no hood.

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