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11-25-2009, 09:51 AM   #1
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Question about Macro F1:4 50mm Lens

I sold my Pentax SLR film camera, lenses, extension tube set, and other accessories a few years ago when I went "digital". BIG MISTAKE! My digital cameras work fine in most applications, but taking pictures of a large model train layout isn't one of them. By being limited to f8, I can't get any decent depth of field.

So, as of a few days ago I am $100 poorer, but am now the proud owner of a used Pentax K1000. The camera came with a Macro F 1:4 50mm lens and I understand from reading various comments in the Pentax Lens Review Forum that this is an excellent lens that should also render sharp images at greater distances than macro. Now this is my question: What do the white numerals 2 through 25 mean. I have searched the internet for detailed info about the lens, but so far have only found this site:

M 50/4 Macro

Any information and comments would be greatly appreciated.

11-25-2009, 09:53 AM   #2
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My guess is 1:n (n being the number from 2 to 25) magnification.
11-25-2009, 12:59 PM   #3
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QuoteOriginally posted by jerrymouse Quote
My guess is 1:n (n being the number from 2 to 25) magnification.
That's correct.
11-25-2009, 03:36 PM   #4
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So this is a 1:2 (maximum) macro lens which is able to capture an object up to half life-size.

11-25-2009, 03:39 PM   #5
Damn Brit

Why are you limited to f/8?
11-27-2009, 08:37 AM   #6
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jerrymouse wrote: My guess is 1:n (n being the number from 2 to 25) magnification.

That's it. Thanks for your reply. I checked and at numeral 2, a 70mm wide target approximately equals 35mm in width in the view finder, i.e., a magnification of 1/2.

Damn Brit wrote: Why are you limited to f/8?
That's the smallest aperture a Canon Power Shot S3IS has. This is not uncommon for even mid-priced digital cameras.

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