FYI
Nothing new:
Instead of using a bellows you can simply turn the lens of the camera around to take
macro-pictures. You have to use a so called retro-adaptor. But the disadvantage is that you can
not control the apreture or it is very laborious to adjust it. There are a lot of proposals and
solutions and some of them are quite "adventurous".
I was aiming to find a solution which is simple but sofisticated and above all easy and safe to
use.
I converted a Sigma lens, 28 -105 mm Asherical IF with a defective AF, to be used as a
retro-lens with a control for the apreture. I used this Sigma lens because it is stable enough to
carry it's own weight when it is attached the wrong way around to the body of the camera and
you want to adjust the focal length. Just try if for yourself: take a lens, hold it at the front where
you would usually attach the filters and try to ajust the focal length and you will see what I
mean.
I still had one plastic-ring with sigma-bayonet left from the auto-bellows.
http://www.sigmauserforum.com/forum/showthread.php?t=28
This ring has a Ø of 65 mm and fits perfectly for the 28-105. So I just glued it.
I soldered a short 7 conductor cable directly to the PCB* of the lense. The other end of the
cable is connected 1:1 to the contact block of the sigma-bayonet. On the open side of the lens,
the former back side which is now the front, I screwed a left over canon-bayonet to protect the
lens. Well, what else can you use a canon-bayonet for? The retro-lens is well proctected with
one sigma and one canon lense-cap. You do not need a lenshood because the front-lens is
retracted deep enough inside the lens-body.
This might be different when you work with other lenses but it should be no problem to use the
lens-cap and attach a lens-hood to it. (Just cut out a hole big enough for the lens-hood to fit in
for example)
*Printed Circuit Board
I attached some pictures I took with the retro-adapter to give you some impression of various
focal-lenght.
See you with nice pictures
Uwe
View attachment 336
View attachment 337
View attachment 338
View attachment 339
@105mm distance ~60cm
View attachment 340
@78mm distance ~35cm
View attachment 341
@60mm distance ~25cm
View attachment 342
@72mm distance ~30cm
View attachment 343
Nothing new:
Instead of using a bellows you can simply turn the lens of the camera around to take
macro-pictures. You have to use a so called retro-adaptor. But the disadvantage is that you can
not control the apreture or it is very laborious to adjust it. There are a lot of proposals and
solutions and some of them are quite "adventurous".
I was aiming to find a solution which is simple but sofisticated and above all easy and safe to
use.
I converted a Sigma lens, 28 -105 mm Asherical IF with a defective AF, to be used as a
retro-lens with a control for the apreture. I used this Sigma lens because it is stable enough to
carry it's own weight when it is attached the wrong way around to the body of the camera and
you want to adjust the focal length. Just try if for yourself: take a lens, hold it at the front where
you would usually attach the filters and try to ajust the focal length and you will see what I
mean.
I still had one plastic-ring with sigma-bayonet left from the auto-bellows.
http://www.sigmauserforum.com/forum/showthread.php?t=28
This ring has a Ø of 65 mm and fits perfectly for the 28-105. So I just glued it.
I soldered a short 7 conductor cable directly to the PCB* of the lense. The other end of the
cable is connected 1:1 to the contact block of the sigma-bayonet. On the open side of the lens,
the former back side which is now the front, I screwed a left over canon-bayonet to protect the
lens. Well, what else can you use a canon-bayonet for? The retro-lens is well proctected with
one sigma and one canon lense-cap. You do not need a lenshood because the front-lens is
retracted deep enough inside the lens-body.
This might be different when you work with other lenses but it should be no problem to use the
lens-cap and attach a lens-hood to it. (Just cut out a hole big enough for the lens-hood to fit in
for example)
*Printed Circuit Board
I attached some pictures I took with the retro-adapter to give you some impression of various
focal-lenght.
See you with nice pictures
Uwe
View attachment 336
View attachment 337
View attachment 338
View attachment 339
@105mm distance ~60cm
View attachment 340
@78mm distance ~35cm
View attachment 341
@60mm distance ~25cm
View attachment 342
@72mm distance ~30cm
View attachment 343
