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10-05-2019, 07:02 AM - 1 Like   #1
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New Acquisition - Spiratone Extension Tubes

I've never used these before, but they looked interesting. Picked them up for $15 with shipping.


Last edited by jawats; 02-23-2020 at 11:05 AM.
10-05-2019, 10:10 AM   #2
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QuoteOriginally posted by jawats Quote
I've never used these before, but they looked interesting. Picked them up for $15 with shipping.

Congrats on a good buy! If one has any interest at all in close focusing, a set of auto tubes is worth having on hand.
Are yours made in Japan? In my experience, Japanese made K mount tubes are hard to find.

A few years ago I bought a set of Vemar automatic K tubes on ebay. I was amazed at their build quality compared to the (non auto) cheap, Chinese made K tubes I already owned.

There might be an issue though. Do your tubes have black mount surfaces? My Vemars have black mounts which are non-conductive. In order to get the tube / lens to stop down on my Pentax DSLRs, I had to sand off the black finish on the tube's mount where it meets the camera's contacts.


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10-05-2019, 11:03 AM   #3
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QuoteOriginally posted by .a.t. Quote
Congrats on a good buy! If one has any interest at all in close focusing, a set of auto tubes is worth having on hand.
Are yours made in Japan? In my experience, Japanese made K mount tubes are hard to find.

A few years ago I bought a set of Vemar automatic K tubes on ebay. I was amazed at their build quality compared to the (non auto) cheap, Chinese made K tubes I already owned.

There might be an issue though. Do your tubes have black mount surfaces? My Vemars have black mounts which are non-conductive. In order to get the tube / lens to stop down on my Pentax DSLRs, I had to sand off the black finish on the tube's mount where it meets the camera's contacts.


Attachment 466907
I'm not sure if they're Japanese made. They're very solid, and apparently, Spira was known for importing products from Japanese manufacturers. The back sides are matte black; the front (outward facing) are silver. The levers are all working well. I've not experimented enough with them yet to know whether they are doing anything. Plus, the experiments I have run were all with a Pentax SMC-M 135mm 3.5.
10-05-2019, 12:25 PM   #4
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That is a good find. Congratulations.

10-05-2019, 01:10 PM   #5
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QuoteOriginally posted by wings Quote
That is a good find. Congratulations.
Thank you! I'm excited to compare them to my Tamron 60-300 SP with its macro function.
10-05-2019, 07:39 PM   #6
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QuoteOriginally posted by .a.t. Quote
Congrats on a good buy! If one has any interest at all in close focusing, a set of auto tubes is worth having on hand.
Are yours made in Japan? In my experience, Japanese made K mount tubes are hard to find.

A few years ago I bought a set of Vemar automatic K tubes on ebay. I was amazed at their build quality compared to the (non auto) cheap, Chinese made K tubes I already owned.

There might be an issue though. Do your tubes have black mount surfaces? My Vemars have black mounts which are non-conductive. In order to get the tube / lens to stop down on my Pentax DSLRs, I had to sand off the black finish on the tube's mount where it meets the camera's contacts.


Attachment 466907
Very interesting topic - I've never heard of these before. What do you mean a.t. by "close focusing"?
10-05-2019, 07:57 PM - 1 Like   #7
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QuoteOriginally posted by jawats Quote
Picked them up for $15 with shipping.
Sound like a very good deal. Hope to see it in action soon.

10-06-2019, 12:21 AM - 1 Like   #8
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QuoteOriginally posted by PaysonAZTim Quote
Very interesting topic - I've never heard of these before. What do you mean a.t. by "close focusing"?

Extension tubes are an inexpensive alternative to dedicated macro lenses. They reduce the minimum focus distance of a lens which allows for greater magnification of the subject.

The tubes are just hollow connectors which fit between a camera and lens to position the lens further than normal from the camera. And that greater distance between camera and lens is what allows the lens to focus more closely to the subject and achieve higher magnification.

Tubes typically come in sets of three. The longer the tube(s) used, the greater the magnification.

Does that make sense? This site explains it better than I can:
Macro Extension Tubes & Close-up Lenses
10-06-2019, 09:13 AM   #9
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QuoteOriginally posted by .a.t. Quote
Extension tubes are an inexpensive alternative to dedicated macro lenses. They reduce the minimum focus distance of a lens which allows for greater magnification of the subject.

The tubes are just hollow connectors which fit between a camera and lens to position the lens further than normal from the camera. And that greater distance between camera and lens is what allows the lens to focus more closely to the subject and achieve higher magnification.

Tubes typically come in sets of three. The longer the tube(s) used, the greater the magnification.

Does that make sense? This site explains it better than I can:
Macro Extension Tubes & Close-up Lenses
Here's a decent video on them -
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