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Old 18th November 2021, 10:16 AM
Nat Polton Nat Polton is offline
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Default Hasselblad Softar Filter.

I recently picked up a Hasselblad Softar Filter quite cheaply. I do not have a Hasselblad, but intend to use it under the enlarger lens.

It does not feel cold when touched, so I am wondering if it is some sort of resin plastic.
Can anyone tell me if it is glass, and if it is plastic what cleaning fluid would be suitable?

The reason why I ask is, I remember years ago using 100% iso-propyl alcohol on a special effects filter that was given away with a magazine.
It melted the surface and became a cloudy, coloured disc.
I didn't realise it was plastic at the time.

Cheers.
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Old 18th November 2021, 10:36 AM
Collas Collas is offline
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B+W still make them after taking over the licence from Carl Zeiss. The B+W filters are made of glass.

They make an extensive range of cleaning products! I've used the Lens Cleaner Pump Spray in the past on plastic spectacle lenses and glass filters and it does a good job. I've also used Zeiss cleaning fluid and Lee Filters Clear Lee and they all seem to work very well.

https://schneiderkreuznach.com/en/ph...ning-transport
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Old 19th November 2021, 06:13 PM
Nat Polton Nat Polton is offline
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Thank you Collas.
I shall happily clean it knowing it is glass.
Cheers.
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Old 19th November 2021, 06:33 PM
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billcowan billcowan is offline
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No, No! The new B&W are advertised as glass, but the old Hasselblads are, at least some, if not all, are Optical resin.
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Old 19th November 2021, 10:40 PM
Nat Polton Nat Polton is offline
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Thankyou Bill.
You caught me just in time.

I think I shall get the filter out of its frame tomorrow and have a proper look to see if it is resin or glass.
A jab with a needle on the outer edge will prove for sure if it is glass or resin.

Thank you Bill.

Cheers.
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Old 20th November 2021, 02:09 AM
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Happy face.
I have one which has the most remarkable circular cleaning marks which has made a No. 1 filter in to a No. 3+ filter. very dramatic and still good for a perfectly fine soft focus effect; just more than what was intended.
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Old 21st November 2021, 01:01 PM
Nat Polton Nat Polton is offline
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Thank you to both Collas and Bill.

My filter has printed on it "Hasselblad. Carl Zeiss Softar II Lens-Germany."

I could not undo the thread to get the filter out of the frame, it is rock solid and I didn't fancy a slip with the tool and a possible scratch.

So I took a sharp needle and lightly pressed it into the filter at the very edge of the frame.
The needle proved it is some sort of plastic.

My go to lens cleaning solution is Baader Optics Lens Cleaning Fluid.
All worked fine. Nice and clean now.

Although I have used a few resin filters and had no complaints about them,I tend to look on them as slightly inferior to glass. Rightly or wrongly.
It surprises me that Hasselblad would use plastic filters.


Thanks again.


Cheers.
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Old 21st November 2021, 01:26 PM
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I expect the problem with using glass was getting the lenslets all oriented and spaced, whereas casting plastic allowed that sort of design. I must say I am still a bit skeptical that the new B&W filters are actually glass (despite the advertising) or that they are composed of lenslets, Still never say never.
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