Dumb question: How do I use Hasselblad B60 filters?

[biogon]

This is embarrassing. I just picked up an old 501C after many years of having gone without my old standby, the Mamiya RB, and I can't figure out how to use the proprietary Bay 60 filter mount.

I bought a B+W filter, but it simply slides on and slides off loosely.

Is it supposed to click in place, or are the flanges supposed to be pulled up so they aren't flush with the rest of the ring and thereby provide friction? Is that all that's holding the filter in place? That seems... slippery.

I probably should've just gotten a B60 -> 67mm adapter like everyone else, but noooo.... I wanted to be fancy. Drat.

Thanks!

 

[removedacct1]

Its supposed to click into a kind of a locked position. You should feel it clunk into place. Are you sure you've bought a B60 filter for a B60 lens?

 

[biogon]

@paulbarden,

I think so. It's an 80mm CF and it's marked "For Hasselblad / 60" 1x HZ -0 in a B+W box, although it doesn't say B+W on the filter itself.

It doesn't "clunk" or snap into place at all. If I try to rotate it further, one of the bent flanges bends further out of place.

Looking on the lens itself, there's a little silver pin sticking up. Is it supposed to be fully upright? It looks like that's what catches onto one of the flanges on the filter.

@APUGuser19:
Ahh... so the plot thickens. How interesting... that's disappointing! I guess I'll just have to use a cap on a string then.

Thank you all!

 

[itsdoable]

The B60 filter mount does not click or snap into place, it stays on with spring loaded friction, which is supplied by the tabs on the filter. The tabs often get bent out over time so the filter becomes loose. You can bend them back with your finger, or use a tool (like the handle of a screw driver) to press them in a bit more so they are tighter.

you can see the tab has been bent in a bit on this well worn filter that I leave on my CF250.

For filters you want to leave on the lens you can make them fit tight. For B&W or IR filters that you want to leave off while you focus, you can set them loose so they go on easily without jogging the camera.

 

[Sirius Glass]

Welcome to APUG
If the tab is bent, return it. It should twist on easily and stay on.

 

[biogon]

@itsdoable:

Ah ha! Thank you! I bent those tabs out a bit and it definitely stays on more tightly now.

But it's surprising how much less secure it is than even a loosely-fitted threaded filter.

I guess that's why the H series lenses have switched from bayonet mount to threaded mount.

Thanks again! (I'd googled and googled and surprisingly found nothing...)

-Jon

The B60 filter mount does not click or snap into place, it stays on with spring loaded friction, which is supplied by the tabs on the filter. The tabs often get bent out over time so the filter becomes loose. You can bend them back with your finger, or use a tool (like the handle of a screw driver) to press them in a bit more so they are tighter.

For filters you want to leave on the lens you can make them fit tight. For B&W or IR filters that you want to leave off while you focus, you can set them loose so they go on easily without jogging the camera.

 

[biogon]

Fashion yourself a little strip of masking tape to put on the offending filters. Just wrap it all the way around the so-called bayonet threads one time. I did that to the bay 5-to-67mm ring that is permanently mounted to my rubber lens hood. I bet I've taken that thing off a million times in the last 7 years, and the same tape I put on there then is still there now. Helps to "jam" on the ring, and you have to purposefully remove it. It's not going to fall off by accident. Works perfectly.

Brilliant. The only masking tape I had around the house was the blue painter's stuff, so I used some gaffer tape instead. Since it was so thick, I only needed a tiny bit on one of the tabs.

That thing is on there securely now, and even after a few mount/remove cycles, it's not going anywhere.

Love it -- thank you!

 

[itsdoable]

...Ah ha! Thank you! I bent those tabs out a bit and it definitely stays on more tightly now....

I find they work better if you bend them in towards the filter.

As APUGuser19 said, tape works great too, but I prefer not to have something that eventually gets gummy or powdery in there that I have to clean out. Bending the tabs the right amount secures the filters sufficiently for me.

 

[biogon]

I find they work better if you bend them in towards the filter.

As APUGuser19 said, tape works great too, but I prefer not to have something that eventually gets gummy or powdery in there that I have to clean out. Bending the tabs the right amount secures the filters sufficiently for me.

Huh. I didn't think of that. Makes sense -- with them out, they felt prone to getting snagged on things.

I used gaffer tape -- in the past, I've found that it has held up well without significant degrading for a number of years. It does leave a little residue after a while, but that comes off pretty easily.

Sounds like there are several good fixes for this problem.

Now, to find an affordable hood for the 150. I'll try bending in the tabs inward this time.

Thank you!