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07-24-2008, 11:26 AM   #1
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1:1 Macro with extension tubes

QuoteOriginally posted by hinman Quote
I have few test shots using my K10D, Pentax A 50 f/2.8 1:2 Macro along with Vivitar AT-22 Extension tubes.

All are hand held test shots. In avoiding the wind, I used one hand to hold the flowers still while I took these with single hand, hence the softness in some of the shots. No sharpening are performed on these test shots.



Vivitar AT-22 Extension tubes.

My setup with 20mm on Pentax A 50mm f/2.8


#1


#2


#3


#4
my left hand in the bokeh


#5



#6
CA is well controlled



I learned about these extension tubes from another Pentaxian who recommend this extension tubes with Pentax M 100mm f/4.0 1:2 Macro and I have the Pentax K 100mm f/4.0 1:2 macro which I can use 56mm extension to get a bit over 1:1 magnification, Joachim's review and sample shots using 36+20=56mm extension

Joachim's review on Pentax M 100mm f/4.0 1:2 Macro
(In the review, Joachim uses close to 60mm extensio, perhaps 56mm, to get close to 1.1:1 ratio)

Please PM me with questions.

Thanks,
Hin
Just in case someone is looking for extension tubes, I have the extension tubes on sale in marketplace.

https://www.pentaxforums.com/forums/photographers-marketplace/32342-vivitar-2...eplus-mc4.html

Thanks,
Hin


Last edited by hinman; 07-27-2008 at 10:27 PM.
07-24-2008, 03:25 PM   #2
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Very nice and good information to know!
07-24-2008, 03:33 PM   #3
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QuoteOriginally posted by Curbster54 Quote
Very nice and good information to know!
Thanks for the kind comments. I hope someone looking for these tubes will take it off my hand as I would like to upgrade with a better macro lens.

Marketplace Posting for Vivitar AT-22 Extension Tubes

For those who know how to use extension tubes, I actually have a question on SR focal length. With the extension tube on a manual focus lens such as my Pentax A 50mm f/2.8 1:2 Macro, when I add an extension with 20mm tube, what SR focal length should I enter for the correct SR compensation to work properly?

Thanks,
Hin

Last edited by hinman; 07-24-2008 at 06:35 PM.
07-27-2008, 08:08 PM   #4
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QuoteOriginally posted by hinman Quote
For those who know how to use extension tubes, I actually have a question on SR focal length. With the extension tube on a manual focus lens such as my Pentax A 50mm f/2.8 1:2 Macro, when I add an extension with 20mm tube, what SR focal length should I enter for the correct SR compensation to work properly?

Thanks,
Hin
I'm also interested in the answer to this.

07-27-2008, 09:44 PM   #5
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I don't know this for a fact, but my best guess is add the mm of tubes to the focal length of the lens and enter that...

that would be what I would use...
07-28-2008, 02:35 AM   #6
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QuoteOriginally posted by hinman Quote
Thanks for the kind comments. I hope someone looking for these tubes will take it off my hand as I would like to upgrade with a better macro lens.

Marketplace Posting for Vivitar AT-22 Extension Tubes

For those who know how to use extension tubes, I actually have a question on SR focal length. With the extension tube on a manual focus lens such as my Pentax A 50mm f/2.8 1:2 Macro, when I add an extension with 20mm tube, what SR focal length should I enter for the correct SR compensation to work properly?

Thanks,
Hin
With respect to the shake reduction and extension tubes.

In theory, you should add the extension tube length to the focal length, BUT in practice, you should turn the shake reduction OFF and use a tripod.

I don't care who you are or what your technique, but it is impossible to get a good true macro, with what you want in focus, without using a tripod. ou cannot hold your distance to subject accurately enough to keep the object in the correct focus.
07-28-2008, 01:16 PM   #7
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QuoteOriginally posted by Lowell Goudge Quote
With respect to the shake reduction and extension tubes.

In theory, you should add the extension tube length to the focal length, BUT in practice, you should turn the shake reduction OFF and use a tripod.

I don't care who you are or what your technique, but it is impossible to get a good true macro, with what you want in focus, without using a tripod. ou cannot hold your distance to subject accurately enough to keep the object in the correct focus.
I tried the Vivitar AT-22 extension tubes this morning with my Pentax K 100mm f/4.0 1:2 Macro. It is extremely difficult if NOT impossible to do hand-holding.

Here are my setup



Pentax K 100mm f/4.0 1:2 Macro

Vivitar AT-22 extension tubes

Extension tubes used: 36+12=48mm

No sharpening applied in pp; all are hand-held in iso 400




#1


#2


#3


#4
very blurry shot in 1:1 due to off focus
with slight movement


#5


#6


#7


#8


1:1 Macro with Extension Tubes


When I turn my focus to the minimum closest distance with marking at 1:2 ratio, I have an extremely difficult time to obtain focus in 1:1, but when I turn slightly to 1:2.5 or 1:2.2 minimal focusing distance, I find focus feasible as compared to 1:1 with the extension tubes. The closer to 1:1, the harder it is to obtain focus, perhaps due to the razor thin DOF.

With two different shoot out, I have to say that the extension tubes are good to retain bokeh, flare control and CA control with the lens with no addition of optical elements. But I find 100mm is too difficult for me to do hand-holding without tripod whereas 50mm is a bit easier to obtain focus for me.

Thanks,
Hin

Last edited by hinman; 07-28-2008 at 06:27 PM.
07-28-2008, 02:46 PM   #8
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Thanks Hin...I look forward to receiving the extension tubes so I can give it a try.

Earl
QuoteOriginally posted by hinman Quote
I tried the Vivitar AT-22 extension tubes this morning with my Pentax K 100mm f/4.0 1:2 Macro. It is extremely difficult if NOT impossible to do hand-holding.

Here are my setup



Pentax K 100mm f/4.0 1:2 Macro

Vivitar AT-22 extension tubes

Extension tubes used: 36+12=48mm

No sharpening applied in pp; all are hand-held in iso 400




#1


#2


#3


#4
very blurry shot in 1:1 due to off focus
with slight movement


#5


#6


#7



When I turn my focus to the minimum closest distance with marking at 1:2 ratio, I have an extremely difficult time to obtain focus in 1:1, but when I turn slightly to 1:2.5 or 1:2.2 minimal focusing distance, I find focus feasible as compared to 1:1 with the extension tubes. The closer to 1:1, the harder it is to obtain focus, perhaps due to the razor thin DOF.

With two different shoot out, I have to say that the extension tubes are good to retain bokeh, flare control and CA control with the lens with no addition of optical elements. But I find 100mm is too difficult for me to do hand-holding without tripod whereas 50mm is a bit easier to obtain focus for me.

Thanks,
Hin


07-28-2008, 06:38 PM   #9
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QuoteOriginally posted by big_ezy Quote
Thanks Hin...I look forward to receiving the extension tubes so I can give it a try.

Earl
After trying it all out the extension tubes on 1:2 macro lens with 50mm and 100mm, I have to say the extension tubes work better for me with 50mm than the 100mm due to the weight added. For the 100mm in 1:2 macro, you need to add 50mm to make it 1:1. For the 50mm in 1:2 macro, you need to add 25mm extension and I use 20mm.

My experience with the extension tubes have both pluses and minuses. Optically, it is the better option than diopter or 2x macro extension as I don't see CA, flare, bokeh, and loss of IQ with extension tubes are much better controlled as compared to diopter or Macro 2x converter. But the extension tubes is a bit harder to use compared to other two methods that I try

While trying out all the alternatives, I am saving up for the true 1:1 macro lens as in Tamron 90mm SP f/2.8 1:1 Macro.

All the best,
Hin

Last edited by hinman; 07-28-2008 at 06:58 PM.
07-28-2008, 06:52 PM   #10
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For anybody who's looking for the Tamron 90/2.8 macro, KEH has 3 of them for sale ranging from $310 to $325.

KEH Camera: Pentax Auto Focus - Non-Mfg Fixed Focal Lenses

KEH also has a FA100/2.8 macro for $399:
KEH Camera: Pentax Auto Focus - Fixed Focal Lengths - 100 F2.8 SMC FA MACRO (58) WITH CAPS 35MM SLR AUTO FOCUS TELEPHOTO LENS

HTH,
Heather

HTH,
Heather
07-29-2008, 02:50 PM   #11
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QuoteOriginally posted by hwblanks Quote
For anybody who's looking for the Tamron 90/2.8 macro, KEH has 3 of them for sale ranging from $310 to $325.

KEH Camera: Pentax Auto Focus - Non-Mfg Fixed Focal Lenses

KEH also has a FA100/2.8 macro for $399:
KEH Camera: Pentax Auto Focus - Fixed Focal Lengths - 100 F2.8 SMC FA MACRO (58) WITH CAPS 35MM SLR AUTO FOCUS TELEPHOTO LENS

HTH,
Heather

HTH,
Heather
Heather, thanks for the link. I find the new one is not priced much more after $90 rebate before Aug 31, 08, I think. At BHPhoto, it is about $450 - $90 (rebate) = $360 new.

TA9028MPAF* | B&H Photo Video

Thanks,
Hin
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