Extension Tube Test

**jawats** · 10-06-2019, 01:46 PM

I purchased three Spiratone extension tubes for use on my K-3. Here are some SOOC images from a few shots with the 20mm tube and a Promaster Spectrum7 28mm, f/2.8.

All taken at f/5.6, ISO 200, 1/200 - 1/500s shutter speed.

Last edited by jawats; 02-23-2020 at 11:04 AM.

**marcusBMG** · 10-06-2019, 02:30 PM - **1 Like**

And now try with the lens reversed (you'l need a reversing ring)...

**jawats** · 10-06-2019, 05:07 PM

Originally posted by marcusBMG

And now try with the lens reversed (you'l need a reversing ring)...

Marcus,

That would mean I'd need a reversing ring for any lens I wanted to use, no?

**sergysergy** · 10-06-2019, 06:32 PM - **1 Like**

If they have different diameters yes. You also need them to have an aperture ring so that aperture is not always closed.

sp500 · 10-06-2019, 11:56 PM - **1 Like**

I really like the Dandelion shot!

**UncleVanya** · 10-07-2019, 06:49 AM - **1 Like**

Originally posted by sergysergy

If they have different diameters yes. You also need them to have an aperture ring so that aperture is not always closed.

Or just a bit a folded paper to temporarily hold the aperture level to keep the lens open.

**marcusBMG** · 10-07-2019, 07:09 AM - **1 Like**

Check out Johan's excellent web site:

Extreme Macro Photography

**pentaxus** · 10-07-2019, 11:39 AM - **2 Likes**

I have a 28mm Takumar that works great reversed. Some lenses work less well. A fun project.

**bwgv001** · 10-07-2019, 01:30 PM - **1 Like**

the folded paper trick is nice.

**UncleVanya** · 10-07-2019, 02:17 PM - **1 Like**

Originally posted by bwgv001

the folded paper trick is nice.

You can also use any DA style mount adapter if the distance is enough and the adapter isn't in the way: for example a k to nex adapter. These da store versions usually have a ring you can turn to open and close the aperture in a stepless way.

disconnekt · 10-07-2019, 10:01 PM - **1 Like**

Here is another site I found not that long ago that you might find useful: Macro Extension Tubes & Close-up Lenses

**UncleVanya** · 10-08-2019, 05:55 AM - **1 Like**

Originally posted by UncleVanya

You can also use any DA style mount adapter if the distance is enough and the adapter isn't in the way: for example a k to nex adapter. These da store versions usually have a ring you can turn to open and close the aperture in a stepless way.

To be clear I mean you can have an adapter on the rear of the reversed lens which allows easy psuedo control of aperture in an uncalibrated stepless way.

10-06-2019, 01:46 PM	#1
jawats Site Supporter Join Date: Nov 2017 Photos: Gallery \| Albums Posts: 756	Extension Tube Test I purchased three Spiratone extension tubes for use on my K-3. Here are some SOOC images from a few shots with the 20mm tube and a Promaster Spectrum7 28mm, f/2.8. All taken at f/5.6, ISO 200, 1/200 - 1/500s shutter speed. Last edited by jawats; 02-23-2020 at 11:04 AM.

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10-06-2019, 02:30 PM - 1 Like	#2
marcusBMG Site Supporter Join Date: Nov 2012 Location: North Wales Photos: Gallery \| Albums Posts: 2,868	And now try with the lens reversed (you'l need a reversing ring)...

10-06-2019, 05:07 PM	#3
jawats Site Supporter Join Date: Nov 2017 Photos: Gallery \| Albums Posts: 756 Original Poster	Originally posted by marcusBMG And now try with the lens reversed (you'l need a reversing ring)... Marcus, That would mean I'd need a reversing ring for any lens I wanted to use, no?

10-06-2019, 06:32 PM - 1 Like	#4
sergysergy Site Supporter Join Date: Jan 2011 Photos: Gallery Posts: 5,170	If they have different diameters yes. You also need them to have an aperture ring so that aperture is not always closed.

10-06-2019, 11:56 PM - 1 Like	#5
sp500 New Member Join Date: Mar 2016 Location: Utah Posts: 24	I really like the Dandelion shot!

10-07-2019, 06:49 AM - 1 Like	#6
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,398	Originally posted by sergysergy If they have different diameters yes. You also need them to have an aperture ring so that aperture is not always closed. Or just a bit a folded paper to temporarily hold the aperture level to keep the lens open.

10-07-2019, 07:09 AM - 1 Like	#7
marcusBMG Site Supporter Join Date: Nov 2012 Location: North Wales Photos: Gallery \| Albums Posts: 2,868	Check out Johan's excellent web site: Extreme Macro Photography

10-07-2019, 11:39 AM - 2 Likes	#8
pentaxus Site Supporter Join Date: Jun 2010 Location: Central Coast, CA Posts: 1,313	I have a 28mm Takumar that works great reversed. Some lenses work less well. A fun project.

10-07-2019, 01:30 PM - 1 Like	#9
bwgv001 Site Supporter Join Date: Aug 2015 Location: Alabama Photos: Gallery Posts: 697	the folded paper trick is nice.

10-07-2019, 02:17 PM - 1 Like	#10
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,398	Originally posted by bwgv001 the folded paper trick is nice. You can also use any DA style mount adapter if the distance is enough and the adapter isn't in the way: for example a k to nex adapter. These da store versions usually have a ring you can turn to open and close the aperture in a stepless way.

10-07-2019, 10:01 PM - 1 Like	#11
disconnekt Pentaxian Join Date: Oct 2011 Location: SoCal/I.E. Photos: Albums Posts: 1,699	Here is another site I found not that long ago that you might find useful: Macro Extension Tubes & Close-up Lenses

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10-08-2019, 05:55 AM - 1 Like	#12
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,398	Originally posted by UncleVanya You can also use any DA style mount adapter if the distance is enough and the adapter isn't in the way: for example a k to nex adapter. These da store versions usually have a ring you can turn to open and close the aperture in a stepless way. To be clear I mean you can have an adapter on the rear of the reversed lens which allows easy psuedo control of aperture in an uncalibrated stepless way.