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08-28-2012, 11:25 AM   #1
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Impromptu Acquisition - D-FA 100 2.8 Macro WR

I thought I would not buy any lens for a long time. But the temptation was just so great.....

In terms of macro lens, I already have a Tamron 90mm, a Sigma 50mm, and a Vivitar 135mm Close Focusing, but yesterday I couldn't resist a D-FA 100 2.8 Macro WR from a local CL listing. A quick test in the backyard this morning tells me that this is a keeper.

Here it is, with the original hood:



But if you know me, I love step-down adapter rings. A 49-28mm makes the lens even more compact, and provides better protection for the lens:



Test photos, nothing exciting but they tell me that I will be using this lens a lot. JPEG files are taken directly from the K-7, no post processing except for re-sizing.







08-28-2012, 11:53 AM   #2
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Yeah, I have the FA 100 and don't see a big reason to change. I think they're pretty comperable. So the Pentax version is a marked improvement? Is it just handling, or do you see nicer images?
08-28-2012, 12:19 PM   #3
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I've never use the FA-100 macro so can't compare. But I can see that I will be using the Pentax D-FA 100 more than the Tamron 90. Compared to the Tamron, the Pentax:

- is ligher and more compact.
- hunts less in focusing.
- does not have a limiting switch, but "Quick Shift" more than makes up for it
- is as sharp as the Tamron, but bokeh is much better.
- has better build, even though the Tamron's build is sufficient for my applications.

The Tamron has an aperture ring, which is an advantage with bellows and with non-A extension tubes.

Last edited by SOldBear; 08-28-2012 at 02:15 PM.
08-28-2012, 12:32 PM   #4
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I appreciate your comparison of the Pentax to the Tamron. One question, I've seen teh 49-28 step downs used before but don't you get vignetting as a result?

08-28-2012, 12:42 PM   #5
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QuoteOriginally posted by Docrwm Quote
I've seen teh 49-28 step downs used before but don't you get vignetting as a result?
I know for sure that with 49-30.5, there is no vignetting.

But I haven't tested the 49-28 extensively yet, even though initial testing shows no vignetting.

I also use the 49-28 for FA-50 and F-28 with no vignetting.
08-28-2012, 01:55 PM   #6
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Thanks for sharing your experience with the lens and showing us how it looks with the stepdown filter, which is a nifty idea.
08-28-2012, 03:04 PM   #7
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QuoteOriginally posted by SOldBear Quote
I know for sure that with 49-30.5, there is no vignetting.

But I haven't tested the 49-28 extensively yet, even though initial testing shows no vignetting.

I also use the 49-28 for FA-50 and F-28 with no vignetting.
Thanks. That looks like an interesting approach that would be easy to try out. I may be investigating it myself.
08-29-2012, 06:37 AM   #8
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I was wondering if this 49-28 step down ring would not decrease the amount of light reaching the sensor.

08-29-2012, 07:10 AM   #9
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QuoteOriginally posted by Voe Quote
I was wondering if this 49-28 step down ring would not decrease the amount of light reaching the sensor.
There's a difference between the light that's focused to make the image,
and the stray light bouncing around that degrades the image.
08-29-2012, 10:57 AM   #10
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QuoteOriginally posted by Voe Quote
I was wondering if this 49-28 step down ring would not decrease the amount of light reaching the sensor.
Think telescopes. You want as much light from the stars to enter the telescope as possible. But you don't want any light from the lamp posts next to the telescope.
08-29-2012, 08:08 PM   #11
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I have never used the tamron, but I do love the dfa100. Mine was an impulse buy too. I was deciding between the 35 and the 100 and had just purchased the 35 when I saw an excellent copy of the 100 for sale, so I picked it up. I really like that they decided to make it wr.

I love the idea about the step down ring. I am going to have to try that out.
08-29-2012, 11:50 PM   #12
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I concur about the step-down ring, I'll have to give that a try on my DA35/2.4. What other lenses have you used them on? I suppose that it wouldn't be quite as effective in minimising flare as a long hood would be due to the angles involved, but not bad, I'm sure.
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