The ultimate SIGMA-Macro-Kit

[netzuser]

Hi Bob,
do you have a link for the mentioned "Russian bellows" ?
I would like to have a look at them to see what size they are
and what they mechanically look like.
For the adaptor / extension rings I think the M42 are to small.
The diameter is somewhat around 48 - 50 mm.
The Sigma bayonet has an outer Ø of 65mm,that is what you need at least.
I had some plastic rings made for me by a friend,65mm outerØ and 50mm innerØ.They are 8mm thick.
The FD bayonets I used have a shoulder at the inside which is 50mm,so it matches perfectly and you do not have a centering problem.
The Canon Auto Bellows is equipped with FD bayonets.
You take off the front one and mout it to the back counterpart.
Go through the threads here and you will find more details in the pictures.
Good luck
Uwe

 

[Guest .]

Hi All, Hi Uwe,


Well, Uwe and I know from the SIGMA-community. Most impressing ... even "revolutionary" was his first SIGMA-bellows which he once presented in another German-photo forum.
I nearly overlooked it at that time, because a "gifted" moderator turned it from the SIGMA-section to the "kit and kaboodle" section.

http://www.dslr-forum.de/showthread.php?t=279835&highlight=Balgenger%E4t

Uwe and I then went to C-info ... there good ideas were presented and appreciated.

Since then, Uwe has developed a lot of very nice and useful SIGMA-stuff and inspired others and me to recreate things and do further thinking.

Thanks for that Uwe!:z02_respekt::z02_respekt::z02_respekt:

See you with nice pictures

Klaus

 

[jasonh]

For the adaptor / extension rings I think the M42 are to small.
The diameter is somewhat around 48 - 50 mm.
The Sigma bayonet has an outer Ø of 65mm,that is what you need at least.
I had some plastic rings made for me by a friend,65mm outerØ and 50mm innerØ.They are 8mm thick.
The FD bayonets I used have a shoulder at the inside which is 50mm,so it matches perfectly and you do not have a centering problem.

So does this mean I will not get optimal results if I use an M42 lens and M42 extension tube? What would the end result be, vignetting?

 

[netzuser]

Hi Jason,
the previous discussion is on the mechanical aspect only,just how to get parts
together,it has no effect on the optical performance.
If you use a M42 lense,an extension tube and a M42-Sigma adapter you will have no vignetting or shading at all.
All you loose will be one f-stop or may be two with a long tube.
Keep in mind: a longer tube (or bellows) will give you a bigger ratio
but on the other hand you have to go very close to your object.
That effect can be compensated to a certain extend by using a longer lense
i.e. using a 100mm lense instead of a 50mm one.
hand you
Regards
Uwe

 

[Guest .]

Hi Jasonh,

M42-Macro works perfectly as well. The only disadvanatage is that you have to slow down aperture manually. You will have to cope with a fairly dark viewfinder then! I do not mind that all that much.

View attachment 1526 View attachment 1527

View attachment 1528

All these shots are M42-results (PORST 75-260mm F:4,5 MACRO-ZOOM + M42 bellows.+ flashlight)

If I remember right, I had it slowed down to F:16 for wider DOF.

See you with nice pictures

Klaus

 

[akv]

My mind is blown....
very cool work!