
Getting more than 1:1 macro from 1:1 lenses
#1
Posted 07 July 2005 - 07:41 AM
The lenses I'm specifically interested in doing this with are:
Canon 100mm macro
Sigma 50mm and 150mm macro
Will the same technique work equally well with all three (and others)?
Bruce Yates
www.UnderwaterReflections.com
Lumix GX8 in Nauticam, Canon 5DMkII in Aquatica, 1DsMkII in Seacam, G15 in RecSea...Inon Z240's...too many lenses
"If at first you don't succeed, try, try again. Then quit. No use being a damned fool about it." WC Fields
#2
Posted 07 July 2005 - 08:35 AM
Both teleconverters and diopters will help increase magnification. Teleconverters maintain working distance, but steal light. So an f2.8 50mm lens with a 1.4x TC becomes a 70mm f4 lens.
Diopters decrease working distance but don't steal any light. They are effective with lenses which start with a long working distance. Shorter working distance lenses like the 50mm do not benefit from the diopter as you don't have enough working distance to make a photo (the close focus is literally inside the port...lol). There are wet diopters that mount on the outside of the port and dry diopters that mount on the lens. There are achromat (multiple element) diopters which are better than the single element type because they reduce chromatic aberration (spelling???).
HTH
James
Dual Ikelite Strobes
Photo site - www.reefpix.org
#3
Posted 07 July 2005 - 09:07 AM
James: go back to bed, you are a newly wed and should still be trying to reproduce (or at least pretend to)

Jean Bruneau
www.vizart.ca
Aquatica Pro Digital housings for D-800, Sigma 8mm & 15mm Fisheye, Nikon AF 14MM, AF 17-35mm, AF 20MM, AF 60MM, AF 105MM, 4x Ikelite Ds 160, and TLC arms exclusively
#4
Posted 07 July 2005 - 09:26 AM
Sea & Sea strobes
www.underthecaribbean.com
#5
Posted 07 July 2005 - 09:51 AM

Rand
#6
Posted 07 July 2005 - 10:04 AM
Cool!
Which 2X are you using? I haven't found many choices for Nikon AF (vis a vis AF-S) lenses.
Thanks,
Chris
Subal ND70 + 2X DS125 ... mostly 10.5, 16, and 60
#7
Posted 07 July 2005 - 10:17 AM
A TC question. My recollection is that Canon's 1.4x and 2x TC's only work with their L series lenses. What TC's are usable with Canon's non-L and/or more generic (e.g., Sigma) lenses?
Bruce Yates
www.UnderwaterReflections.com
Lumix GX8 in Nauticam, Canon 5DMkII in Aquatica, 1DsMkII in Seacam, G15 in RecSea...Inon Z240's...too many lenses
"If at first you don't succeed, try, try again. Then quit. No use being a damned fool about it." WC Fields
#8
Posted 07 July 2005 - 10:48 AM
#9
Posted 07 July 2005 - 11:12 AM

The way I figure the lens and a 60mm tube would give you 1:1 if the focus was left at infinity...

Jean Bruneau
www.vizart.ca
Aquatica Pro Digital housings for D-800, Sigma 8mm & 15mm Fisheye, Nikon AF 14MM, AF 17-35mm, AF 20MM, AF 60MM, AF 105MM, 4x Ikelite Ds 160, and TLC arms exclusively
#10
Posted 07 July 2005 - 11:28 AM
And if you can double the magnification with an extension tube, why would anyone use a 2X TC, which has a (significantly) higher price, and which introduces extra glass and thereby reduces photo quality to boot?!

Bruce Yates
www.UnderwaterReflections.com
Lumix GX8 in Nauticam, Canon 5DMkII in Aquatica, 1DsMkII in Seacam, G15 in RecSea...Inon Z240's...too many lenses
"If at first you don't succeed, try, try again. Then quit. No use being a damned fool about it." WC Fields
#11
Posted 07 July 2005 - 11:40 AM
Sea & Sea strobes
www.underthecaribbean.com
#12
Posted 07 July 2005 - 11:59 AM
#13
Posted 07 July 2005 - 12:04 PM
And if you can double the magnification with an extension tube, why would anyone use a 2X TC, which has a (significantly) higher price, and which introduces extra glass and thereby reduces photo quality to boot?!
I'm not convinced that using the 2x results in un-acceptable photo quality. Frankly, my goal is to spend enough time with this set-up to show that the photos are up to snuff. It's just the right dive trip conditions need to present themsleves. One more with the 2xTC:

Rand
#14
Posted 07 July 2005 - 12:44 PM

Jean Bruneau
www.vizart.ca
Aquatica Pro Digital housings for D-800, Sigma 8mm & 15mm Fisheye, Nikon AF 14MM, AF 17-35mm, AF 20MM, AF 60MM, AF 105MM, 4x Ikelite Ds 160, and TLC arms exclusively
#15
Posted 07 July 2005 - 12:50 PM
Jean Bruneau
www.vizart.ca
Aquatica Pro Digital housings for D-800, Sigma 8mm & 15mm Fisheye, Nikon AF 14MM, AF 17-35mm, AF 20MM, AF 60MM, AF 105MM, 4x Ikelite Ds 160, and TLC arms exclusively
#17
Posted 07 July 2005 - 01:08 PM
The extension tubes will allows closer focusing resulting in higher magnification, this without loss of opticall quality but the drawback is proximity, you end up being much closer so use only with longer focal lenght.
I don't think you can make this assumption for evey lens. Even though an extension has no glass to distort the image, it places the lens further away from the image plane than it is designed for. The optical quality is not guaranteed.
I've used both TC and diopters with good results. Sometimes both at the same time. The shot below was taken with the Canon 100mm with a 1.4x TC and a +2 diopter. F/6.3 which is effictively F/9 for shallow DOF.

Canon 5D; Aquatica housing; 2 Inon Z220 strobes; Canon 100mm macro, 17-40mm ; Sigma 15mm FE, 24mm macro, 50mm macro
#18
Posted 07 July 2005 - 01:26 PM
Cheers
James
Dual Ikelite Strobes
Photo site - www.reefpix.org
#19
Posted 07 July 2005 - 01:42 PM
Sea & Sea strobes
www.underthecaribbean.com
#20
Posted 07 July 2005 - 07:30 PM
I am using a lot of close up filters myself these days, was going to use the 1.4TC but they sent me the wrong one....
I like the limited DOF it gives and i think is an easy way to go, without having to worry about extra length on your lenses and ports.
Too bad Chris Bangs doesn't seem to post on here these days, he has some great examples of using all sorts of combinations as that is one of his specialties (guess he is too busy taking photos of children!!!!



However, i do find that the filters do work with a 60mm, this is an example of 60mm with a +4. True, i had to get right on them to get this full frame but..it worked...luckily they were turned this way
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