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Post by Peterj on Jul 22, 2019 21:30:03 GMT
I'm putting together a short (emphasize short) presentation for our photo club about Neutral Density Filters and would love to have input
Link to external because can't post pdf
TIA
Pete
Notes follow the presentation
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Post by Major Major on Jul 22, 2019 21:41:19 GMT
Pete -
Did you mean to include a link?
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Post by hmca on Jul 22, 2019 22:11:00 GMT
Nice basic introduction. Three things that you might want to consider adding are the importance of using a tripod;
the value of using a remote and that a long exposure calculator can be downloaded to your phone for determining
exposures longer than 30 seconds.
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Post by Peterj on Jul 22, 2019 23:56:48 GMT
Pete -
Did you mean to include a link?
Yes - it's already there ... Neutral Density Filters in red
did you not see it?
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Post by Bailey on Jul 22, 2019 23:57:28 GMT
Hi Peter,
I agree with Helen.
Another addition I would suggest is adding just a little explanation on basic exposure theory to your "How?" slide explaining what a "stop" is.
I would just simply add a simple explanation saying something like " a 1 stop increase/decrease in exposure is simply a doubling/halving of the amount of light that hits the camera sensor".
It might help those who don't fully understand the term "stop" in understanding why a 1 stop reduction in light needs double the exposure time to maintain the same exposure as shown on your slide.
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Post by fotofrank on Jul 23, 2019 3:58:28 GMT
Hi Pete,
First of all nice presentation. I agree it would be helpful to include a couple of apps that will do the calculations and timing for you.
On slide 3, showing stops and not point something (.3, .6, .9) may make a little more sense. Your 1 stop and 2 stop filter show the exact same settings.
Hope that helps.
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Fauxtoto
Established Forum Member
Quebec, Canada
Posts: 440
Open to constructive criticism of photos: Yes
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Post by Fauxtoto on Jul 23, 2019 15:21:19 GMT
Peterj , Thanks for sharing. I have already learned a few things from it and it sparked my interest. Maybe: - As an indication, add a table of equivalence of stops for a few densities (nd 0.3 = 1 stop; nd 0.6 = 2 stops; nd 0.9 = 3 stops […]. - Slide 12 : small font difficult to read. - Slide 12 : “circular or screw on”. It can be seen as two different things (Would circular without screw on exist?) If it is not the intention, maybe eliminate the synonym. - Add a few links on the Web as references on the subject.
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Post by Major Major on Jul 23, 2019 17:23:41 GMT
Pete -
Did you mean to include a link?
Yes - it's already there ... Neutral Density Filters in red
did you not see it?
Sorry, missed it. Carry on, then.  |
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Post by tonyw on Jul 23, 2019 21:12:42 GMT
Good presentation but I did wonder about your brief comment about variable density filters. That’s all I use and I didn’t really consider it expensive (mine’ a Cameron and was around $70 when I got it). More expensive are around but I’ve not had any issues with mine. I can see why it could be useful for video but it’s also good for still as it saves carrying around a selection of fixed ND filters. My main use is for waterfalls and they vary greatly in the ND required so the variable is very handy. I’ve also used for sunsets at the lake to smooth the water and tone down the sun. Again being variable makes it easy to adjust as the sun goes down and loses brightness.
Just some thoughts on my experience
Tony
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Post by Peterj on Jul 24, 2019 5:59:59 GMT
Here's a way to smooth motion without using ND filters. I took multiple exposure of some falling water with my camera on a tripod and used median stacking.
Single image - ISO 100, f/8. 1/13
Result of 10 images stacked
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Post by Peterj on Jul 24, 2019 6:06:52 GMT
Good presentation but I did wonder about your brief comment about variable density filters Thanks. I have no experience with variable density filters ... the comment was my summation of research.
1-the density isn't locked and is easy to move 2-at higher settings there's an "X" present 3-generally suited for video
I'll be sure to mention that some folks like yourself have good luck with them
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Post by BuckSkin on Aug 15, 2019 5:28:01 GMT
Link to external because can't post pdf
Maybe it's just me, but all I get on that link is a many-paged PDF of blank white pages. As for the variable ND, I had a really nice one that went from almost nothing to completely black/dark, until the hanging loop on the wife's filter wallet gave way and it landed on the blacktop. I keep a gradient ND on my camera almost 99% of the time --- even indoors; I don't have nearly so much indoor lighting problems when the gradient ND is on. On a similar note, the wife forgot and left her CPL on the camera when she took a few hundred indoor shots in weird lighting and they turned out so good that she decided to be certain it is on there the next time she has an indoor project; maybe that is not the accepted way of doing things, but we go with what works for us. |
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Post by Bailey on Aug 15, 2019 7:39:34 GMT
Hi Buckskin,
The only time I would use a CPL filter indoors is when the lighting is very good, since the filter reduces the amount of light hitting the sensor, and I have reflection issues.
Otherwise I can normally solve lighting issues by using my portable flash gun either as key or fill light.
But like with anything, if it works for you then go with it.
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Post by Peterj on Aug 15, 2019 16:57:19 GMT
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