f16sunshine
Moderator
One thing working in your favor is the aperture design. The blades are unusually large which may make them easier to re-produce if required (less fiddly than tiny little feather blades). Plus there are only 3 of them.
who can rebuild the aperture system in a lens?
- Thread starter raid
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raid
Dad Photographer
They were there at the time of the first repair attempt.
f16sunshine
Moderator
Raid check out this link It's to a B+H listing for a Canon Eos to m4/3 adapter.
The adapter has an iris built into it. I wonder if you could get something like this and also an adapter for QBM to Eos. I saw other listings for similar items for as little as $60.
This way you could mount your QBM lens to the adapter and then use the built in iris when mounted on the Olympus 4/3 cameras.
If you were to choose a Sony a7 in the future, there are adapters that do the same thing for that mount.
I stumbled on this while searching for an Eos to Fuji XF adapter. I want to adapt my EF f2/100mm onto my Fuji Xpro1. The Eos lenses do not have aperture rings to adjust aperture.
It seems there are all sorts of adapters with apertures built in to overcome this Eos issue. I doubt it works for wider lenses but for a 50mm or longer lens it is probably going to work great! Especially on a cropped sensor.
The problem may be finding one that leaves you with F2 and wider openings.
Obviously having an aperture in the lens would be ideal but if the blades are missing it could be very expensive. Since you are adapting it to a digital body and need an adapter anyway, this may be an excellent and economical solution.
It's also a round iris which may actually give you a nicer rendering than the native aperture sahpe of the QBM lens.
Cheers!
The adapter has an iris built into it. I wonder if you could get something like this and also an adapter for QBM to Eos. I saw other listings for similar items for as little as $60.
This way you could mount your QBM lens to the adapter and then use the built in iris when mounted on the Olympus 4/3 cameras.
If you were to choose a Sony a7 in the future, there are adapters that do the same thing for that mount.
I stumbled on this while searching for an Eos to Fuji XF adapter. I want to adapt my EF f2/100mm onto my Fuji Xpro1. The Eos lenses do not have aperture rings to adjust aperture.
It seems there are all sorts of adapters with apertures built in to overcome this Eos issue. I doubt it works for wider lenses but for a 50mm or longer lens it is probably going to work great! Especially on a cropped sensor.
The problem may be finding one that leaves you with F2 and wider openings.
Obviously having an aperture in the lens would be ideal but if the blades are missing it could be very expensive. Since you are adapting it to a digital body and need an adapter anyway, this may be an excellent and economical solution.
It's also a round iris which may actually give you a nicer rendering than the native aperture sahpe of the QBM lens.
Cheers!
raid
Dad Photographer
Thank you for this idea, Andy. I will give it serious thoughts. I will see how much DAG wants to build new aperture blades.
I will look into your idea next.
I will look into your idea next.
raid
Dad Photographer
I have emailed KIPON to see what is the largest aperture possible with the EOS adapter. I could use such a set-up when using the lens in sunshine. I will not need the 1.4 aperture then. I switch adapters when using the lens indoors so that I can use it wide open. This could be a great way to get it done, Andy. Thanks. The other option is that Amedeo adapts the lens to M mount. He is considering to adapt the QBM 50mm, so I need to see if he accepts the 85mm lens too or not. I wonder what Don Goldberg would charge me for crafting three blades.
f16sunshine
Moderator
Great! I hope it works out.
On ebay there were several adapters ranging from $40- over $100.
Not that the price is a dramatic issue but rather... maybe there is one with a larger diamter to allow a larger max aperture.
It's an interesting work around in any event. 🙂
On ebay there were several adapters ranging from $40- over $100.
Not that the price is a dramatic issue but rather... maybe there is one with a larger diamter to allow a larger max aperture.
It's an interesting work around in any event. 🙂
raid
Dad Photographer
The other option is to use an ND filter! It does some crazy stuff with color and the sensor, though.
