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01-10-2009, 12:25 AM   #31
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PentaxScott:

Take the warranty into consideration too.

01-10-2009, 03:18 AM   #32
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One thing to keep in mind with the minimal focus distance is that it is measured to your sensor pane. It is not to the front element. So depending on the length of the lens itself, it may not be that far away from the glass.

Adding a quality TC can increase the working distance if i'm not mistaken... could be wrong on that though.

Cheers
Shang
01-10-2009, 03:54 AM   #33
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Another DFA 100mm new onwer.
Just pull the trigger on one. Hope I get a good copy.
01-10-2009, 12:25 PM   #34
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Thanks again eveyone for your continued comments on the thread. All 3 of the lenses are so similar you could split hairs trying to find a reason to get one over the other...

QuoteOriginally posted by audiobomber Quote
In AF mode, most of the time it just snaps into focus. If it gets lost, I just grab the focus ring and bring it back to the subject. Not a problem at all.
Perfect! That was a bit of a concern.

Its good to hear that people are also finding that the quick-shift system is in some ways taking the part of the focus limiter. (Creampuff mentioned he really liked it) That lack of a limiter really made me question its use beyond macro only. It seems though that others arent having too much of a problem.

01-11-2009, 09:30 AM   #35
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If you are still looking for a 100mm lens there looks to be one up for sale in the marketplace:

https://www.pentaxforums.com/forums/photographers-marketplace/46235-sigma-105...-dg-macro.html

This is the version of the sigma lens that I have been talking about in this thread.
01-11-2009, 09:48 AM   #36
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QuoteOriginally posted by BBear Quote
sorry for hijacking the thread, but i have a quickie question regarding 100mm Macro: I have the DFA 100mm and it is 1:1 macro. I opt for 100mm because i read some inputs saying that it is better to work with insects and all.

Once I received the lens, when I try to set the focus on the 1:1 scale, the object it is TOO DAMN near to the lens! am I doing something wrong?

I had the impression 100mm macro would give me some working space... and I have none! I can't imagine how a 50mm macro lens would work then!

Is this the way it works?

Thanks in advance!
Sorry again to OP, just to answer the above.

For 100mm macro, on 1:1 magnification, the working distance is about 6 inches from the subject. When you put on the hood, the distance from the insects is even shorter, maybe 2 to 3 inches and for insects, will not be feasible due to sensitivities. You may want to consider 180mm sigma for greater working distance or 200 A macro f4. for insects. Still some of my macro insects was taken with vivitar 105 or voigtlander macro 125 without the hood.

50 mm macro is great for still life macro, not for insects.

Hope this helps.

marcus
01-11-2009, 10:20 AM   #37
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It's real hard sneaking up on Insects and Flowers when you have to get closer than 12 inches.
01-11-2009, 10:53 AM   #38
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QuoteOriginally posted by Fl_Gulfer Quote
It's real hard sneaking up on Insects and Flowers when you have to get closer than 12 inches.
The only away around this is to get a 180mm or 200mm macro. However, there are many people that use 90 to 105mm macro lenses for insect work on a regular basis. I agree that the 180mm to 200mm are best for insects that are very active. Those lenses are also heavier and people new to photography sometimes don't adjust well to them and the weight of them and tripod requirements add to this.

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