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02-27-2013, 11:03 AM   #1
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I want to understand the different series of lenses from Pentax

\Body: K01


ok, I know DA/DA-L = autofocus & autometering

then there's:
F =
FA =
A =
M42 =

can someone give me a qwikndirty summary? I'm getting confused when looking at FA, F, A, DA lenses.

Also do some A lenses not do autometering- if they don't have an A setting?

I know that some have quickshift, metal mounts, etc, but in this thread, I would like to understand which lens offers what in terms of focus and autoaperture/need to use green button.

02-27-2013, 11:07 AM   #2
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https://www.pentaxforums.com/forums/pentax-lens-articles/114925-pentax-lenses...ns-reflex.html
02-27-2013, 11:07 AM - 1 Like   #3
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F = Autofocus, auto-aperture
FA = Autofocus, auto-aperture
A = manual focus, auto-aperture (all have an "A" setting)
M42 = manual focus, manual aperture, no green button, viewfinder becomes dimmer as you stop down

K = manual focus, manual aperture, use green button
MK = manual focus, manual aperture, use green button
02-27-2013, 11:19 AM   #4
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QuoteOriginally posted by alphanerd Quote
F = Autofocus, auto-aperture
FA = Autofocus, auto-aperture
A = manual focus, auto-aperture (all have an "A" setting)
M42 = manual focus, manual aperture, no green button, viewfinder becomes dimmer as you stop down

K = manual focus, manual aperture, use green button
MK = manual focus, manual aperture, use green button
thank you SOO much!
so as a lens buyer, DA, FA and F work the same. I didn't realize that.

02-27-2013, 11:24 AM   #5
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thanks Doc, hadn't seen that table
02-27-2013, 11:25 AM   #6
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QuoteOriginally posted by PBandJ Quote
thanks Doc, hadn't seen that table
No problem. Hope it helps.
02-27-2013, 11:28 AM   #7
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Don't forget this either...

Pentax K-Mount Lenses Explained: The differences between various Pentax lens series

QuoteQuote:
Also do some A lenses not do autometering- if they don't have an A setting?
The FA 28 soft and the FA 85 soft don't have an A setting. They have to use stop down metering just like the K and M series.

Last edited by boriscleto; 02-27-2013 at 11:35 AM.
02-27-2013, 12:00 PM   #8
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QuoteOriginally posted by alphanerd Quote
F = Autofocus, auto-aperture
FA = Autofocus, auto-aperture
A = manual focus, auto-aperture (all have an "A" setting)
M42 = manual focus, manual aperture, no green button, viewfinder becomes dimmer as you stop down

K = manual focus, manual aperture, use green button
MK = manual focus, manual aperture, use green button
M42 also require an adapter to fit onto modern dSLRs (M42 to K adapter).

02-27-2013, 12:00 PM   #9
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QuoteOriginally posted by PBandJ Quote
thank you SOO much!
so as a lens buyer, DA, FA and F work the same. I didn't realize that.
Except the one F lens we have will scare away wildlife when it focuses and will crank your wrist when it stops if the focus travel was a long distance.
02-27-2013, 12:04 PM   #10
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QuoteOriginally posted by normhead Quote
Except the one F lens we have will scare away wildlife when it focuses and will crank your wrist when it stops if the focus travel was a long distance.
Shoot that lens on an SF1 and scare wildlife in the next county
02-27-2013, 12:08 PM   #11
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QuoteOriginally posted by normhead Quote
Except the one F lens we have will scare away wildlife when it focuses and will crank your wrist when it stops if the focus travel was a long distance.
If you have a K-x the shutter noise will get you arrested for hunting without a license in many states.
02-27-2013, 12:10 PM   #12
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don't forget, DA lenses are APS-C sized image circle, the others "full frame"
02-27-2013, 12:17 PM   #13
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And DA L are the same as their DA counterparts, but with cheaper overall build. They come without a hood, they don't have quickshift, they have a plastic mount, don't allow CiF.. and they may have a different filter size.
most DA lenses are APS-C sized, which means that on a full frame or film camera they might have heavy vignetting on the edges. But some were tested on film cameras and some are just fine, there is a thread about this, it includes a list on which DA lenses project a full frame circle and which an crop circle. DFA are modern lenses that can definitely be used on full frame.
Other things you should learn about is WR (weather resistant. If you have a WR camera, it will only be really WR if the lens is also WR) and then the difference between regular lenses, star (*) lenses, and limited lenses. These are basically higher quality than regular lenses, but also more expensive.
02-27-2013, 12:20 PM   #14
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thanks, the most confusing thing was what I would be required to do using each.

Which F lens are you guys talking about? Not the 70-210 hopefully!

Also, some Vivitar Series 1(2.8-4, Komine) reviews say they have the A setting. Does someone have a picture of what that looks like? Is it just the aperture ring?
02-27-2013, 12:23 PM   #15
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QuoteOriginally posted by PBandJ Quote
Which F lens are you guys talking about? Not the 70-210 hopefully!
Absolutely! Whir, whir, bang! Focus locked!
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