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Please help me -- Steinheil Macro-Quinar 100/2.8
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PostPosted: Wed Oct 22, 2014 7:18 am    Post subject: Please help me -- Steinheil Macro-Quinar 100/2.8 Reply with quote
Hello Chaps

Recently, I purchased a Steinheil Macro-Quinar 100/2.8 M42. After receiving it, I did a brief inspection, and found the aperture is always stuck wide-open no matter I press the pin on the mount or push the level on the lens (related to pin). I uploaded a video to demonstrate the problem better. What I want to know is if it can be confirmed the lens is faulty? or I just didn't do it right...

https://www.youtube.com/watch?v=XNbh4Lep7I8&list=UU_6ipxhf3UUQ8AKREVzxRLQ

Kind regards,
Peng


PostPosted: Wed Oct 22, 2014 8:19 am    Post subject: Reply with quote
That could be caused by a number of things. Oil on the aperture blades, mechanical issue (something missing or stuck inside the mechanism that moves the blades), for example. Only way to know for sure is to open the lens, I´m afraid.


PostPosted: Wed Oct 22, 2014 9:16 am    Post subject: Reply with quote
Given the aperture blades appear to be partly closed, likely oil on the blades. You might find that if you keep the pin pressed for long enough the blades will close down after a few minutes.


PostPosted: Wed Oct 22, 2014 9:43 am    Post subject: Reply with quote
Thank you guys for the inputs. It seems there is definitely problem with this lens.

I think the best way is to send back to the seller...


PostPosted: Wed Oct 22, 2014 10:01 am    Post subject: Reply with quote
pengbai wrote:
Thank you guys for the inputs. It seems there is definitely problem with this lens.

I think the best way is to send back to the seller...


Definitely a good idea, imho.
Only exception would be if you got the lens for a ridiculously low price: in this case, given the fact that the lens doesn't seem to be extremely common, it may be worth the risk and cost of having it professionaly cleaned.
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