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01-18-2009, 08:26 AM   #1
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D-FA 100/2.8 macro

Hi all,

there's no limit for my questions... Just got today a second-hand DFA 100 macro. No documentation came with it, and I was left wondering what might the switch "clamp off - on" be for? Can anybody help?

BW,

Jari

01-18-2009, 08:40 AM   #2
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Jari,

I don't have this lens myself but you can get any manual from Pentax website:

Customer Support - Official PENTAX Imaging Web Site

Select Category 'Lenses' and Sub-Category 'D FA', then you download the manual.
01-18-2009, 08:44 AM   #3
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QuoteOriginally posted by jesalonen Quote
there's no limit for my questions... Just got today a second-hand DFA 100 macro. No documentation came with it, and I was left wondering what might the switch "clamp off - on" be for? Can anybody help?
Clamp it and try to focus. Nothing happens.

Macro lenses have magnification scale ('1/x' in addition to 'ft' and 'm' distance scale), so for certain applications you want your lens to be set and stay at, say, 1:2 magnification. Then you focus by moving the whole camera back and forth. This focusing approach is typical for macro applications.

I would prefer focus limiter on D-FA 100mm Macro, but for some reason Pentax has decided to remove limiter and leave clamp. IMO, focus limiter would be much more useful feature.
01-18-2009, 08:47 AM   #4
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Is that the focus limiter? You should be able to download a copy of the owners manual for the lens off the Pentax USA website (It will be in English though).

01-18-2009, 09:31 AM   #5
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QuoteOriginally posted by Wheatfield Quote
Is that the focus limiter? You should be able to download a copy of the owners manual for the lens off the Pentax USA website (It will be in English though).
There's no fucus limiter on the D FA 100mm. As Ivan said, the clamp just locks the focussing ring for one set distance.
01-18-2009, 10:01 AM   #6
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The Pentax DFA macro lenses only have a focus clamp. Basically it locks the focusing ring. You can use it in a variety of ways. For example, if you want to shoot at a set magnification or distance (for example 1:1) and you focus by moving the camera forwards or backwards with your body or perhaps a focusing rail. Can also be used if you're using a copy stand to shoot documents or artwork where you don't want the focusing ring to inadvertently move or creep when shooting.
01-18-2009, 10:03 AM   #7
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QuoteOriginally posted by Ivan Glisin Quote
Clamp it and try to focus. Nothing happens.
Damn! So that's what it is for... Canon had nothing like that

Thanks all, again!
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