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<blockquote data-quote="WayneF" data-source="post: 365401" data-attributes="member: 12496">I never tried it, but probably so.&nbsp; Physically, they will bayonet together.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp;&nbsp; The extension tube just extends the lens a little more forward, which makes it focus closer.&nbsp; Has no glass in it, so it does not otherwise change anything, but an extension equal to the focal length can let it focus close enough to focus at 1:1 magnification.&nbsp;&nbsp; 1:1 is an extreme, which pretty much means it will only focus at that one distance (a few inches).&nbsp; Saying, the lens focusing ring will then have essentially no effect at all (at 1:1), no matter how you turn it.&nbsp;&nbsp; If we use a lot of extension (bellows maybe), then possibly the distance behind the lens (the focal length) is less than the distance in front of the lens (subject distance), and then it can be good to reverse the lens.&nbsp; &nbsp;No matter what minor extension is used, the extension tube will no longer allow focus to a far distance.&nbsp; The combination is already limited to a closer distance.The Teleconverter just puts a lens in between to lengthen the focal length.&nbsp; Ever use a telescope?&nbsp;&nbsp; The TC is just a Barlow lens.&nbsp; This is the opposite of a magnifying glass, it reduces the size seen.&nbsp;&nbsp; A reduced size is a reduced angle of view, and the narrow view simulates a longer lens - it puts less subject view over the width of the camera sensor.&nbsp; There are of course a few optical issues, less than perfect, but can be bearable.</blockquote>

[QUOTE="WayneF, post: 365401, member: 12496"] I never tried it, but probably so. Physically, they will bayonet together. :) The extension tube just extends the lens a little more forward, which makes it focus closer. Has no glass in it, so it does not otherwise change anything, but an extension equal to the focal length can let it focus close enough to focus at 1:1 magnification. 1:1 is an extreme, which pretty much means it will only focus at that one distance (a few inches). Saying, the lens focusing ring will then have essentially no effect at all (at 1:1), no matter how you turn it. If we use a lot of extension (bellows maybe), then possibly the distance behind the lens (the focal length) is less than the distance in front of the lens (subject distance), and then it can be good to reverse the lens. No matter what minor extension is used, the extension tube will no longer allow focus to a far distance. The combination is already limited to a closer distance. The Teleconverter just puts a lens in between to lengthen the focal length. Ever use a telescope? The TC is just a Barlow lens. This is the opposite of a magnifying glass, it reduces the size seen. A reduced size is a reduced angle of view, and the narrow view simulates a longer lens - it puts less subject view over the width of the camera sensor. There are of course a few optical issues, less than perfect, but can be bearable. [/QUOTE]

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