Zooming extension tubes for AF Nikkors
Jul 13, 2013 10:45:15 #
http://www.adorama.com/MCHETNK.html?emailprice=t&j=Email071213PPSOP&utm_term=Other&utm_medium=Email&utm_campaign=Email071213PPSOP&utm_source=RSYS
Thought this might have some interest.
Thought this might have some interest.
Jul 13, 2013 11:01:40 #
Jul 13, 2013 12:24:02 #
imagemeister wrote:
I believe these were only for the 6x7, but I could be wrong. Given that timing, I doubt they were AF. Having said that, I haven't followed Pentax since my gear was stolen in a home burglary in the 1980s and I switched to Nikon. Also of note: I rarely use AF for close-up/macro work anyway. AE would be more of a "need" although I typically know what it is anyway. Pentax came out with these about 40 years ago ! .....
When I was shooting with a 500cm 20 years ago, we would play "guess that exposure" and then whip out the light meters to check for bragging rights. Got pretty good at knowing exposures. Still comes in handy today with my rangefinder.
Jul 13, 2013 13:43:59 #
Pentax had these in screw mount for the Spotmatic and, then of course for the K mount, 645, and not sure about the 6X7. The variable tube is a great idea but somewhat expensive to make. Of course in most close up work would/should be manually focusing anyway.
Jul 13, 2013 14:42:00 #
ZOOM Auto-extension tube. This is a great idea! Zooms between 46-mm and 68-mm, with length markings on tube.
Jul 13, 2013 14:54:57 #
Nikonian72 wrote:
The limited number of reviews aren't great-- but several imply that they don't understand how to (correctly) use extension tubes or how to do Macro. ZOOM Auto-extension tube. This is a great idea! Zooms between 46-mm and 68-mm, with length markings on tube.
However, I like the concept....
Jul 14, 2013 08:15:34 #
These & others like them have been around for years. Kenko & Vivitar had 2X macro converters which, when not extended, were a 2X TC but also were able to be extended, thus making the lens focus closer like tubes (& not allowing for infinity focus when that was done) . In essence, they made the 50mm "standard" lens they were to be used on, a 100mm "macro" lens. I still have a couple of the Vivitar units. Tried to remove the glass elements & make this type of "extendable" tubes out of it, but the elements could not be removed...Here's a link to one on eBay for the old Canon FD mount...
http://www.ebay.com/itm/VIVITAR-ADJUSTABLE-MACRO-FOCUSING-2X-TELE-CONVERTER-for-CANON-FD-or-MICRO-4-3-/231015001857?pt=Camera_Lenses&hash=item35c9912f01
http://www.ebay.com/itm/VIVITAR-ADJUSTABLE-MACRO-FOCUSING-2X-TELE-CONVERTER-for-CANON-FD-or-MICRO-4-3-/231015001857?pt=Camera_Lenses&hash=item35c9912f01
Jul 14, 2013 10:49:18 #
Screamin Scott wrote:
I guess I should have specified that the item I posted about is a fully-automated zooming extension tube. I have several PK-13s that I find unacceptable for current use. In any event, I'll be sticking with my Kenko set.These & others like them have been around for ... (show quote)
Jul 14, 2013 10:49:50 #
LoneRangeFinder wrote:
:thumbup: :thumbup:I like the concept....
Jul 14, 2013 11:08:02 #
I think the ad is miss-leading with the word zoom. There probably isn't any internal element or glass, it is simply an adjustable set of tubes. Excellent idea as you wouldn't need to remove lens to adjust focal length as you do with normal 3 piece tubes. No chance to gather dust and dirt within camera or on lens internals when doing field macro work and changing magnification.
:thumbup: :thumbup:
:thumbup: :thumbup:
Jul 14, 2013 12:00:55 #
Jul 14, 2013 12:16:53 #
They would be great to use with enlarger lenses on a DSLR...
Jul 14, 2013 12:45:49 #
Screamin Scott wrote:
They would be great to use with enlarger lenses on a DSLR...
But a bellows has less internal reflections and a greater range, AND - is probably cheaper.....
Jul 14, 2013 13:16:43 #
GPappy wrote:
Nope, I understand the concept perfectly well. Zoom auto-extension tube is the proper term. Tubes never contain optics.I think the ad is miss-leading with the word zoom.
Jul 14, 2013 13:21:38 #
imagemeister wrote:
Bellows are not 'automatic' nor 'field use' friendly. But a bellows has less internal reflections and a greater range, AND - is probably cheaper.....
Cheap is a matter of opinion, and not a desirable quality that over-rides convenience and repeatability.
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