Extension tube modified from Nikkor 200mm lens
Feb 7, 2015 19:29:40 #
Macro extension tube with auto aperture for reverse lenses!
Extends from 75mm to 103mm (magn.2,4x to 2,8x with a reversed 50mm)
Enjoy :D
Extends from 75mm to 103mm (magn.2,4x to 2,8x with a reversed 50mm)
Enjoy :D
Feb 7, 2015 19:45:58 #
Feb 7, 2015 19:46:45 #
Feb 7, 2015 19:51:28 #
oldtigger wrote:
No, no vignette even f/32! vignette isn't a problem?
:thumbup:
Feb 7, 2015 19:58:37 #
dennis2146 wrote:
Some images f/4 to f/32, taken quickly just to show!Very nice. But we want to see pictures, how it performs.
I've removed the black light trap inside to get new, so the images are not good :-(
f/4
(Download)
f/5.6
(Download)
f/8
(Download)
f/11
(Download)
f/16
(Download)
f/22
(Download)
f/32
(Download)
Feb 7, 2015 19:59:51 #
zundapp5 wrote:
Nice.Some images f/4 to f/32, taken quickly just to show!
Feb 8, 2015 03:41:38 #
zundapp5 wrote:
Vignetting would be most apparent at largest aperture, not the smallest.No vignette even f/32!
Feb 8, 2015 03:52:20 #
I previously never heard of removing glass from a lens in order to make an "auto extension tube". This is brilliant.
Where did you learn about this modification?
Choosing Aperture Priority setting on camera with a manual lens & this modified extension tube, makes auto-exposure a reality.
Where did you learn about this modification?
Choosing Aperture Priority setting on camera with a manual lens & this modified extension tube, makes auto-exposure a reality.
Feb 8, 2015 05:23:16 #
Nikonian72 wrote:
I agree with you! But in this case, I mean the vignette caused by the shadow of diaphragm, like f/22 ~32, if it is far from the reversed lens.Vignetting would be most apparent at largest aperture, not the smallest.
I did some experiments with other old lenses, and the 200mm and f/4 are good
Feb 8, 2015 05:26:17 #
Nikonian72 wrote:
Not yet found an article about this subject! They are some experiments that I am doing!I never heard of removing glass from a lens in order to make an "auto extension tube". This is brilliant. Where did you learn about this modification?
Choosing Aperture Priority setting on camera with a manual lens & using this modified extension tube, makes auto-exposure a reality.
Choosing Aperture Priority setting on camera with a manual lens & using this modified extension tube, makes auto-exposure a reality.
If we keep the rear element in place, we increase the magnification 0.8x
Feb 23, 2015 18:47:18 #
With an enlarger lens
60mm f/4.5 Leitz Focotar, adapted
(Download)
ISO 50, 1/60-sec at f/22, flash
(Download)
ISO 100, 1/60-sec at f/22, flash
(Download)
With 50mm 1.8D inverted
(Download)
Feb 23, 2015 20:13:00 #
Feb 26, 2015 15:10:38 #
I still possess a Nikkor-Q 135mm f/2.8 lens that I purchased new in 1972. Not been used for decades, and still in good shape.
I am going to convert to an auto-extension tube for reverse lens mounting, as you have done wit the 200mm f/4. I like the extra stop I gain with my lens.
Any suggested procedure to removing the optics? Any other modifications recommended?
I am going to convert to an auto-extension tube for reverse lens mounting, as you have done wit the 200mm f/4. I like the extra stop I gain with my lens.
Any suggested procedure to removing the optics? Any other modifications recommended?
Nikkor-Q 135mm f/2.8 lens
Feb 26, 2015 18:41:36 #
Nikonian72 wrote:
Is a Pre- AI lens! Works with Nikon DSLR series DF, D3x00, D5x00, D40, D60. For other DSLR's need to be converted !Any suggested procedure to removing the optics? Any other modifications recommended?
http://www.youtube.com/watch?v=i8y9dlgJZS0
http://www.youtube.com/watch?v=53Omeyyd8oE
I do not know where is the diaphragm inside this lens!
If this lens has the diaphragm more of the 30mm far from the lens reversed, you will have a vignette of the shadow of the diaphragm when using small apertures !
If this happens,can be added one Nikon PK13, PN11 or other one compatible auto ET.
This increases the magnification but will reduce the vignette!
All glasses removed with suitable tools, sometimes are very hard to unscrew! http://www.ebay.co.uk/bhp/camera-lens-tool
Be very careful to not damage the blades of the diaphragm when disassembling!
Feb 27, 2015 18:22:28 #
in addition, i built a lens hood for the inverted lens!
Two pictures show the results.
Two pictures show the results.
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.