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03-13-2008, 02:45 AM   #16
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The thing about Voigtlander macro is that it tends to render cool tone to the images.

Surprisingly, your tokina shot produces much cooler tone comparing to voigtlander macro shot!

03-23-2009, 04:52 PM   #17
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QuoteOriginally posted by aegisphan Quote

Note: the Tokina's magnification is a little less than 1:1 since I've not modded the teleconverter. The decrease the exposure value in the Vivitar and Tokina shot by about 0.7 eV to match with the Voigtlander's. The 100% crops, however, are kept at the original exposure.
Hmmm. . . by "teleconverter", do you mean the tokina (or vivitar) dedicated macro extender or something else? What modification would you do to get 1:1 magnification?
03-23-2009, 05:04 PM   #18
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QuoteOriginally posted by troyz Quote
Hmmm. . . by "teleconverter", do you mean the tokina (or vivitar) dedicated macro extender or something else? What modification would you do to get 1:1 magnification?
I am also very confused about exactly which Tokina lens you used (and why, if it's the AT-X 90/2.5 Macro, you did not attach the 1:1 Macro Extender, which it needs to work properly at 1:1).

You mentioned a "teleconverter" - the 1:1 Macro extender is neither a TC nor an extension tube.

What "mod" are you referring to?

Could you please provide some specifics?

Last edited by fwcetus; 03-23-2009 at 05:31 PM.
03-23-2009, 05:59 PM   #19
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hiep hasn't been here in ages :/

03-23-2009, 06:33 PM   #20
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QuoteOriginally posted by k100d Quote
hiep hasn't been here in ages :/
Ah, thanks for the tip. I guess there won't be any more info forthcoming on hiep's "non-scientific test" - <g>.
03-23-2009, 06:53 PM   #21
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QuoteOriginally posted by k100d Quote
hiep hasn't been here in ages :/
Oops. . . my bad. . .

Next time I'll check the year of the last post instead of just the day and month!
03-25-2009, 05:52 PM   #22
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For the curious, I have used a Tamron "F-system" 2X teleconverter to get my Tamron ATX 90mm to 1:1. It is handy because it has A contacts, but there is definitely a loss of image quality compared to without, or to shooting with extension tubes for the same magnification.

One of those 1:1 macro extenders sounds nice!
03-25-2009, 07:14 PM   #23
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QuoteOriginally posted by Nick Siebers Quote
For the curious, I have used a Tamron "F-system" 2X teleconverter to get my Tamron ATX 90mm to 1:1. It is handy because it has A contacts, but there is definitely a loss of image quality compared to without, or to shooting with extension tubes for the same magnification.

One of those 1:1 macro extenders sounds nice!
The interesting thing about the "1:1 Macro Adapter" (as Vivitar calls it for the VS1 90/2.5 Macro lens) and the optically identical "1:1 Macro Extender" (as Tokina calls it for its also optically identical AT-X 90/2.5 Macro lens) is that they are not mere "empty" extension tubes, nor are they "regular" (i.e., magnifying) teleconverters - they have three optical elements inside in each case, but they are primarily for field flattening and aberration compensating at 1:1.


Last edited by fwcetus; 03-25-2009 at 07:22 PM.
03-25-2009, 07:46 PM   #24
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QuoteOriginally posted by aegisphan Quote
All lenses were at wide open (since it is what i use most of the time).
You shoot macro wide open??? How do you manage depth of field?

I have a vivitar 100mm f2.8 macro and I do find it soft wide open, but I only use it a f/16 so I don't really care.

Also, your vivitar is probably defective (as stated before), that's not just "lens softness", there's probably some misaligned element in the lens.
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