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07-22-2008, 03:53 AM   #1
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Macro work with K20D and 18-250 lens

Hi all

I have to say, excuse my lack of knowledge about DSLR photography but I have just jumped into it all and will certainly be getting myself into a course.

I have searched around on the forums but havent had much luck and was wondering whether anyone could help...

Basically I have a K20D + 18-250 Pentax DA lens (F3.5-6.3) and am struggling to be able to get macro shots done right. I know it is a zoom lens and maybe it is a limitation of the lens, not sure?

Basically if fails to focus when at the low focal length (lens all the way back). I can manage to get it to work if I take a few steps back and zoom in. Is this how it should be?

PS: am shooting in P mode

Am I doing something wrong?

Thanks in advance.

07-22-2008, 04:15 AM   #2
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Check out your lens specs here

Pentax | SMCP-DA 18-250mm f/3.5-6.3 ED AL (IF) Autofocus | 21697

Minimum Focus Distance
1.5' (45 cm) [entire zoom range]
07-22-2008, 04:36 AM   #3
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Thanks nulla, makes sense now, damn it!
07-22-2008, 08:24 AM   #4
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QuoteOriginally posted by nulla Quote
Minimum Focus Distance
1.5' (45 cm) [entire zoom range]
I believe that 1.5' is from the sensor, not the front of the lens. But yeah, back up until it focuses.

07-22-2008, 10:55 AM   #5
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Hi nuffsaid

Have a look at the link below, which you might find of some interest ?

Best regards
07-22-2008, 01:02 PM   #6
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Yes, the "macro" function of the 18-250 is really a close up/close focusing capability. At 250mm and 18", you'll get a shot that's ~ 1/3 life size which is where they come up with the 1:3 macro designation.

Now, while it's not a true macro, you can still get some very interesting closeups with it. Combined with the wide zoom range, I think it's one of the best all-around lenses available. Here are a couple of examples, first with the K100D, then with the K20D.

07-22-2008, 01:03 PM   #7
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Since you have the same minimum focus distance over the whole range, you'll get a much more magnified result by setting the lens to 250mm. Should be "macro like."

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