ND Filter + Red Filter

Magnus · May 17, 2005

Before I might waste som shots trying, I would like to know if anybody here has experience using a Red 25 and a ND-8 at the same time ?

jjstafford · May 17, 2005

Together that's six to seven stops, but you probably know that. An important issue with deep red filters concerns focus. Yes, even visible red light will focus out. If you focus through the filters, sometimes you still have to make an extra little nudge of the focus. If you have an IR mark, actual focus is about 30% towards it.

Magnus · May 17, 2005

Yes I realize focussing might become a bit of a hassle, I will shoot Efke 25 and together with the filters mentioned I need not to worry about any movement, Hyperfocal focussing will be applied anyway and innitially shooting at f8 or f11 I don't think I need to worry to much, but I will do a series of testshots anyway, at different F stops and will also focus with-, and without the filters. I have a certain impression in my mind of what I want as an end result which is really hard to put under words at this moment but I will surely post some results if they come out anywhere close to what I originally intended. Issue however is very sharp fixed object which my lens normally achieves very well, I hope by using two filters it will not loose out on quality.

I will be shooting this with a Hasslblad with 80mm and 40mm

Thanks for your reply

Magnus

NikoSperi · May 17, 2005

Given the combined filter factor, I'll risk stating the obvious, but two words come to mind: failure, and reciprocity... don't forget them, and you'll be fine.

Magnus · May 17, 2005

NikoSperi, ... exactly, these words come to my mind too, followed ba shere dissapointment ... hence the question posted here.
However I have looked at a plate of raw chicken liver before and thought "disgusting, yackee" until my Italian friend Marco came along and told me he would make something delicious out of them, and actually succeeded very, very well .... I'me hoping for a similar effect here

Magnus · May 17, 2005

Then again how would I shoot deep, really deep contrast with 30 sec. at f8 in bright daylight and come up with good results ?

(I see now that chicken liver will not help me here!)

Magnus

Nick Zentena · May 17, 2005

That's not enough for 30 seconds of full sun. If my math is right at F/8 you're still under 1 second. Assuming six stops between the two filters.

120? Sure you don't want to do it with sheet film? Then you could just use lith film-)

Magnus · May 17, 2005

It's not full sun actually, I measured it the last couple of days. anything from say 3 + seconds is good, depending on the intensity of the sun. And yes 120 (6x6) is the only thing I have, well apart from 35mm.

I have the ND filter to manage the whole thing singularly (I have lots of ND's, I love shooting "slow") but it's the intense contrast I'me after.....

roy · May 17, 2005

Magnus said:
Yes I realize focussing might become a bit of a hassle

You could always focus and then insert the filters. Reasonably easy if you use slide in Cokin filters in a holder.

jjstafford · May 17, 2005

Note that Hasselblad has two different recommendations for hyper-focal distance: specifically for critical work they do NOTa recommend that you use the settings marked on the lens, but something more conservative. Do that. If you want an example of how far out of acceptable their lens markings are, just ask and I shall show youl, but again, it should be obvious.

jjstafford · May 17, 2005

Final note: TEST! Nobody can assure you with adequate results. You have to make the effort to make some test images and decide for yourself. Is that so much of a worry to do?

Donald Qualls · May 17, 2005

I might mention here that Efke 25 requires a much larger filter factor for a red than normal film -- it has a relatively low red sensitivity compared to common panchro materials and will probably lost at least one more stop with a red, perhaps as much as a stop and a half. If you haven't shot Efke with a red before, I suspect you'll be in for a surprise, and not an altogether pleasant one; at the very least, bracket to +2 over what you think you'll need.

ND Filter + Red Filter

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