DavidBM
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 Re: Super Cheap Laowa 15mm f4 Macro clone.. | |
Fred Miranda wrote:
DavidBM wrote:
Fred Miranda wrote:
Faulta wrote:
But wouldn't that change the focal length and aperture as well? How is the real angle of the macro lens compared to a regular wide angle paired with an extension tube?
David knows more about extension tubes but as far as I know, extension tubes increase lens "magnification" by an amount equal to the extension distance divided by the lens focal length. In theory it should not affect "focal length" although many macro lenses reduce effective focal length when getting towards macro.
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The lens's effective f-stop aperture also increases depending on the extension amount. Keep in mind that the same also happens with dedicated macro lenses.
That's my understanding too. I certainly am using it mainly around 1:2 and a little more.
Sounds like a good solution Fred, though @BastianK@@ (who also has been using the 2/15 for closeup work) and I did have a bit of too and fro, though, about resolution, and though we weren't comparing similar images we had the impression that the macro version has notably better off axis resolution at comparable apertures and magnifications than the 2/15. Though much more distortion in the macro version. Still if macro isn't the prime reason for getting a Laowa 15 then the 2/15 used occasionally with tubes is likely the go.
Yes agree. When adding a 10mm tube to the 15/2, you have to almost touch the subject for 1:1 as well. 
Small extension amounts produce big magnification results on ultra wides but the downsize is having to be too close to the subject.
What surprises me actually @Fred Miranda is that the extension tube actually permits you to focus at all. On most ultrawides that I have used the shortest commercial tube puts the *furthest* focussing distance *behind* the front element.
That's why there is a cottage industry of shaving down tubes to 5mm or so.... It must be something about the design of this lens that makes it possible!
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