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02-02-10, 10:04 PM
#1

Lochwinnoch long exposures

A few long exposures taken at Lochwinnoch this afternoon. I used my B+W 6 stop ND filter and Hoya polarising filter.

1)30 second @ f20


2)30 second @ f18


3)3 minutes and 1 second @ f20



4)13 second @ f20
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03-02-10, 12:10 AM
#2

Re: Lochwinnoch long exposures

Nice shots Dj - think my fave is 3T
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03-02-10, 01:27 PM
#3

Re: Lochwinnoch long exposures

Stunning shots.
Can I ask the benfits of long exposure on something stationary like that.
Is it to get smoother water / sky?
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03-02-10, 02:35 PM
#4

Re: Lochwinnoch long exposures

Quote:
Originally Posted by little me View Post
Stunning shots.
Can I ask the benfits of long exposure on something stationary like that.
Is it to get smoother water / sky?
Thanks little me.

Yes, long exposures help smooth out the water and you get more vibrant colours too. It's also great when there are clouds in the sky during long exposures as the clouds become streaks across the sky and create a sense of movement. Another example would be photographing a lone tree in a field during the daytime with clouds in the sky, if you can get a long enough exposure you can get some amazing looking images. And of course, down at the seaside too, always makes for excellent long daytime exposures.

The 3 minute exposure was not needed on image #3, I could have chosen f8.0 instead of f20 and cut the exposure time needed. This one took two attempts to get the correct exposure as I had to guess the time needed and I do not know how to multiply "normal exposure" X FF (filter factor) e.g if the normal exposure was 1/15 sec, you would multiply that by the filter factor (64 for mine I think) then you would get your correct exposure in seconds. Unfortunatley I do not know how best to do this, so, for the moment I have to guess.

The polariser ads extra time to the exposure too, and can enhance or eliminate reflections. It's very useful if there are a lot of unwanted reflections from the sky/sun in the water.

I'm going to buy the b+w 10 stop ND as my 6stop is not quite enough for the long exposures I want during daytime.
Kit 1
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Canon 400mm f5.6 L
Canon 70-200mm f4.0 L
Canon 17-40mm f4.0 L
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03-02-10, 03:27 PM
#5

Re: Lochwinnoch long exposures

Love no4,it's lovely


     
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04-02-10, 03:18 AM
#6

Re: Lochwinnoch long exposures

Lovely quality as ever Grant.

Number 1 for me - great composition and pin sharp front to back.

I can't even begin to capture your quality but I think number 3 (as a photograph) falls short compared to number 1.
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08-02-10, 09:47 PM
#7

Re: Lochwinnoch long exposures

Quote:
This one took two attempts to get the correct exposure as I had to guess the time needed and I do not know how to multiply "normal exposure" X FF (filter factor) e.g if the normal exposure was 1/15 sec, you would multiply that by the filter factor (64 for mine I think) then you would get your correct exposure in seconds. Unfortunatley I do not know how best to do this, so, for the moment I have to guess.
Well, I do now. My filter factor is 64, so multiplying 1/15 second by 64 = ?
I don't have a clue but if I use division then 64 divided by 1/15 second = 4.2 seconds, the same answer if multiplying.

That (my) method only works for fractions, once the normal exposure runs into seconds, then of course you continue to multiply your filter factor x normal exposure.

Google can multiply fractions, so, for example, typing in 1/50 x 64 would return 1.28 seconds for exposure. So I use 64 divided by 50 and that also gives me the same answer 1.28 seconds. This has really made it easy for me now to calculate my correct exposures when using ND filters, especially since I'll be using one which has a filter factor of 1000.

Ok, here is an easy one, supposing my normal exposure is 4 seconds long,
this is how you calculate with a 6stop ND (FF filter factor of 64)

4 x 64 = 256 seconds, divided by 60 = 4 minute exposure

with my new filter ( factor of 1000) a 2 second normal exposure would turn into

2 x 1000 = 2000 seconds, divided by 60 = 33 minute exposure

using an exposure of 1/20 second (normal exposure) then screwing on the 1000 FF filter.

I would divide 1000 by 20 = 50 second exposure.



I agree Phil, those images are not the best i've shot and certainly not wall hangers. I will only use the first image for one of my website's and it won't be showing on the front page either.

I do appreciate the feedback and c&c, thanks

Grant.
Kit 1
Canon 5D MKII
Canon 400mm f5.6 L
Canon 70-200mm f4.0 L
Canon 17-40mm f4.0 L
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25-02-10, 08:58 PM
#8

Re: Lochwinnoch long exposures

Quote:
Originally Posted by Dejavu View Post
Well, I do now. My filter factor is 64, so multiplying 1/15 second by 64 = ?
I don't have a clue but if I use division then 64 divided by 1/15 second = 4.2 seconds, the same answer if multiplying.

That (my) method only works for fractions, once the normal exposure runs into seconds, then of course you continue to multiply your filter factor x normal exposure.

Google can multiply fractions, so, for example, typing in 1/50 x 64 would return 1.28 seconds for exposure. So I use 64 divided by 50 and that also gives me the same answer 1.28 seconds. This has really made it easy for me now to calculate my correct exposures when using ND filters, especially since I'll be using one which has a filter factor of 1000.

Ok, here is an easy one, supposing my normal exposure is 4 seconds long,
this is how you calculate with a 6stop ND (FF filter factor of 64)

4 x 64 = 256 seconds, divided by 60 = 4 minute exposure

with my new filter ( factor of 1000) a 2 second normal exposure would turn into

2 x 1000 = 2000 seconds, divided by 60 = 33 minute exposure

using an exposure of 1/20 second (normal exposure) then screwing on the 1000 FF filter.

I would divide 1000 by 20 = 50 second exposure.



I agree Phil, those images are not the best i've shot and certainly not wall hangers. I will only use the first image for one of my website's and it won't be showing on the front page either.

I do appreciate the feedback and c&c, thanks

Grant.

What ?

Goggs.....
Kit 1
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Canon 17-40L F4 USM
Canon 50mm F1.8 MK1
Canon 85mm F1.2L MKii
24-105 L IS F4 USM
Canon 70-200 L IS F2.8
Canon 600 EX-RT Flash
Canon 430 EXII Flash
B+W 10 stop ND Filter
Kit 2
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Other Kit
View my profile to see my other kit!


     
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25-02-10, 09:32 PM
#9

Re: Lochwinnoch long exposures

Hi Gordon.

I was just thinking out loud

Trying to calculate exposures using either a 64X ND or 1000X ND filter. I was stumped trying to multiply them i.e 1/15 x 64 Google tells me it would be 4.2 seconds, but I needed to know how to do it in my head or with a calculator. My pocket calculator can't do those sums but I then discovered dividing e.g 64 by 1/15 gives me the same answer as multiplying would. Arithmetic is not my Forte
Kit 1
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Canon 400mm f5.6 L
Canon 70-200mm f4.0 L
Canon 17-40mm f4.0 L
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26-02-10, 07:48 PM
#10

Re: Lochwinnoch long exposures

Hi Grant
How do you get the filter factor I thought ND filters were ND2, ND4, ect.
this is something new to me.

Goggs.....
Kit 1
Canon EOS 5D MKIII
Canon 17-40L F4 USM
Canon 50mm F1.8 MK1
Canon 85mm F1.2L MKii
24-105 L IS F4 USM
Canon 70-200 L IS F2.8
Canon 600 EX-RT Flash
Canon 430 EXII Flash
B+W 10 stop ND Filter
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