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10-01-2018, 11:10 AM   #1
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ND filter reversed

Hi folks!

So, with my ND3 filter (aka welder's goggles) i have to reduce shutter speed 10 stops when properly mounted. Would mounting it reversed allow me to increse shutter speed 10 stops?


Seriously, i glued a 52-55mm step up ring on my DA 40 XS, so that i can mount my ND Filter with 52mm thread on it. But then the filter is mounted reversed. Do you have any reasons why not to do that?
I'm thinking of coating etc., but doubt there is an effect. Filter is a B+W f-pro.

10-01-2018, 12:08 PM   #2
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QuoteOriginally posted by chochichaeschtli Quote
Would mounting it reversed allow me to increse shutter speed 10 stops?
Sure! You could also use it as a flashlight/torch!


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10-01-2018, 12:10 PM - 1 Like   #3
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QuoteOriginally posted by chochichaeschtli Quote
Hi folks!

So, with my ND3 filter (aka welder's goggles) i have to reduce shutter speed 10 stops when properly mounted. Would mounting it reversed allow me to increse shutter speed 10 stops?
That is correct. You will also have to remember to flip the final image left to right and horizontally as the light rays will hit the sensor from a different direction.
10-01-2018, 01:04 PM   #4
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QuoteOriginally posted by pschlute Quote
That is correct. You will also have to remember to flip the final image left to right and horizontally as the light rays will hit the sensor from a different direction.
Actually, when you shoot film with a reversed ND filter, the negatives will come out as positives. Great, as it saves a lot of time in the darkroom (35mm max print size, though).


On a more serious note, B+W indicate that there are antireflective coatings on both sides, but only one side has a dirt and water repellent coating. So, my guess is that the loss of water and dirt repellence it the worst that can happen.

all the best,
Hans

10-01-2018, 02:36 PM - 1 Like   #5
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Or use this and not have to worry about the filter dust and dirt being on the side that isn't as protected...

55-55mm Female to Female Double Dual inner thread 55 and 55 mm Lens Ring Adapter | eBay
10-01-2018, 03:04 PM   #6
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QuoteOriginally posted by UncleVanya Quote
Or use this and not have to worry about the filter dust and dirt being on the side that isn't as protected..
Sorry, but I didn't get the joke
10-01-2018, 03:18 PM   #7
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QuoteOriginally posted by pschlute Quote
Sorry, but I didn't get the joke
No joke. The front side of the filter has special dirt protections (different coatings) and the ring I gave a link to would join the mail 55 to another male 55 using a female to female ring. (It does sound like a joke)

10-01-2018, 03:24 PM - 1 Like   #8
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Try it both ways on something like a bright source of light and see if there is any flaring - most likely no difference at all.
10-01-2018, 04:46 PM   #9
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QuoteOriginally posted by UncleVanya Quote
No joke
Sorry. I did realise yours was a sensible post, but as the first three jokers (myself included) did respond with a jovial reposte, i was trying to keep the humour up
10-01-2018, 04:54 PM - 1 Like   #10
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QuoteOriginally posted by pschlute Quote
Sorry. I did realise yours was a sensible post, but as the first three jokers (myself included) did respond with a jovial reposte, i was trying to keep the humour up
I feel humorless. Lol.
10-02-2018, 12:25 PM   #11
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Thanks for all your humorous and serious replies!
At least it looks sexy

10-02-2018, 12:47 PM   #12
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This is how black holes are formed.
10-02-2018, 02:20 PM - 1 Like   #13
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QuoteOriginally posted by mikeSF Quote
This is how black holes are formed.
Dang! I wish I had thought of that...


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10-02-2018, 02:35 PM - 1 Like   #14
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All future threads about low light photography will now include advice to try reversing a nd filter.
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