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Help with lens mounting

flashmxfreak

flashmxfreak

Member
I use my lens 150mm about one year without problems.
After some time I have bought a extension tube.
So my problem now is, I cannot mount the lens on my HB body without ext. tube.
I can mount the lens on the ext. tube but I cannot to shoot. It clicks only half and half and than I have to remove lens of my body, than will be the shutter full released.

Please look my picture and maybe can you give me a suggestion where the problem could be.

Every idea and help I will appreciate.


Is it at the right position?

Thanks Jan



3145305862_17beaf2e1d_b.jpg




Please do not link but upload any pictures you want to show.
Linking is not allowed because as soon as the source becomes unavailable the forum is left with holes in stead of pictures.
I have uploaded this picture and removed the link.

Hasselbladinfo forum moderator.
 
From the picture, it looks as if the lens needs to be cocked by turning the screw in the direction of the arrow. When using an lens with a bellows or extension tube, they need to be mounted and removed in a specific order. If you already have done the above then it's up to Paul to solve the problem.

Steve
 
Key position

The key from this lens is not in the right position.
There are two possibilities:

1.The collar on the shaft that locks the shaft in the correct position is damaged en about to fail.
2. The collar was the cause of an earlier problem and is modified by a repairman to lock the shaft in a 180° turned position.

That modification is no problem if it is done correctly.
If the repair was done less acurate it can result in a slight off position of the shaft resulting in problems for the lens to engage with the camera.

A new shaft or a suitably modified shaft are the only options.
The shaft is made from extremely hard steel. It is an expensive part.
That makes it a job for an experienced, qualified technician.
 
It sounds not good for me :(
So I have to repair it?
There is no possibility to explore it what is really wrong before I send the lens to service?

Thank you

---
sorry for the link of my picture
 
Of course the true cause of the problem can only be established after the lens has been inspected.
My guess is based on 35 years experience with Hasselblad repairs.
If the lens was repaired before and the job did not last you will need a new part costing 140 euro minimum.
Not a nice way to end the year.
 
polypal said:
Of course the true cause of the problem can only be established after the lens has been inspected.
My guess is based on 35 years experience with Hasselblad repairs.
If the lens was repaired before and the job did not last you will need a new part costing 140 euro minimum.
Not a nice way to end the year.
Click to expand...

The inspection as such is not difficult, just the screws of the bajonet of the lens need to be removed. Then the whole assy can be pulled back for inspection. 5 minute job.

I am not yet convinced that this is not just a matter of incorrect re-assembly. Lets hope that is the case, as like Paul says: this darn high-grade steel driveshaft is expensive. The steel is hard enough to be brittle when it meets serious abuse. If bits are broken off you are toast..

Wilko
 
Diy

Generally speaking work on lenses can best be left to experienced technicians.
Even though disassembly is quite straight forward it takes an experienced eye to see what causes the problem.
A small amount of wear on the drive shaft collar is enough to cause incorrect alignment of the key.
 
polypal said:
Generally speaking work on lenses can best be left to experienced technicians.
Even though disassembly is quite straight forward it takes an experienced eye to see what causes the problem.
A small amount of wear on the drive shaft collar is enough to cause incorrect alignment of the key.
Click to expand...

Yes I see it should be checked by service man.
It seems I have not other choice.

I do not know what to check by dismounting. I have not experience in this case.
It would be at least helpful for me to know generally what kind of revision can I expect.
I have generally not good experience with service in my country.

  1. It takes a long time - one month or more.
  2. They say than "one expensive part was broken" and you pay lot of money and maybe the problem was by far not so serious.
 
polypal said:
Generally speaking work on lenses can best be left to experienced technicians.
Even though disassembly is quite straight forward it takes an experienced eye to see what causes the problem.
A small amount of wear on the drive shaft collar is enough to cause incorrect alignment of the key.
Click to expand...

Indeed. It is one of these precision parts of the Hasselblad system that is either working flawlessly or (when worn, broken, whatever) causes nothing but heartburn.

Wilko
 
Problem solved!

Yipee!
My best HB friend gave me one simply advice and my lens works again!
The answer was simple:
To push slightly the stake in the silver tube (I do not know the right name) and the mechanism was released to wind up the lens again.

Maybe it helps to other HB users, who have a jammed lens like I have had.
 
flashmxfreak said:
Yipee!
My best HB friend gave me one simply advice and my lens works again!
The answer was simple:
To push slightly the stake in the silver tube (I do not know the right name) and the mechanism was released to wind up the lens again.

Maybe it helps to other HB users, who have a jammed lens like I have had.
Click to expand...

That 'stake' is the shutter release. Never seen that cause the drive shaft to not align properly. Really strange.

Wilko
 
wbulte said:
That 'stake' is the shutter release. Never seen that cause the drive shaft to not align properly. Really strange.

Wilko
Click to expand...

Maybe it was thanks my incorrect mounting the lens on the ext. tube.
Who knows.
One is clear for me now.
I will put the lens on the ext. tube or body very carefully.
 
flashmxfreak said:
One is clear for me now.
I will put the lens on the ext. tube or body very carefully.
Click to expand...


Have a look here : http://www.hasselblad.com

You must register there . I is for free . Then go to download manuals .
You will find a PDF (which I am unable to insert here) about extension tubes .
Very carefully read page 2 .

In short words : always , first attach the extension tube to the body , then the lens to the extension tube .
For removal , always remove the lens first from the extension tube and then the extension tube from the body .

Never remove tube + lens as aunit and then separate them . Never .

This you will find in more detail on the extension tube PDF .


Jürgen
 
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