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1. ## Thread: Bride dies at "trash the dress" shoot

by Helen Bach
Replies
55
Views
8,519

### Re: Bride dies at "trash the dress" shoot

Sorry, I thought that you were disputing the 'in water' part of the physics. I suspect that no-one would dispute that a wet dress is heavy out of the water.

One of my friends is a 'messy girl*'...
2. ## Thread: Bride dies at "trash the dress" shoot

by Helen Bach
Replies
55
Views
8,519

### Re: Bride dies at "trash the dress" shoot

I think that Robert's point was that the weight of water in water is zero, in the sense that a 42-gallon trash bag full of water weighs the same when it is in water as the empty trash bag does in air...

by Helen Bach
Replies
104
Views
11,647

### Re: Reciprocity failure

Is it worth mentioning that the reciprocity law has nothing to do with the shape of the H-D curve? The H-D curve could have no straight-line section and the reciprocity law could still hold. What the...

by Helen Bach
Replies
104
Views
11,647

### Re: Reciprocity failure

Fortunately almost every film photographer is quite happy to trust and make extensive practical use of the reciprocity law without it troubling them one little bit. The entire method of film speed...

by Helen Bach
Replies
104
Views
11,647

### Re: Reciprocity failure

The reciprocity law is a good and very useful law over the range of exposure times for which it holds* - virtually all exposure meters are based on it. Here we are talking about the failure of the...

by Helen Bach
Replies
104
Views
11,647

### Re: Reciprocity failure

If you are sticking to colour neg then there's probably no need to tell the lab anything. I've used Portra 160 (with standard C-41 processing) for exposures of around 20 minutes with no problems....
7. ## Thread: Movie Theater Lens

by Helen Bach
Replies
5
Views
1,292

### Re: Movie Theater Lens

1:2.4 is quite popular, and it can be achieved with a 1.3x squeeze lens, like the Hawk anamorphics, on an Alexa.

Best,
Helen

by Helen Bach
Replies
104
Views
11,647

### Re: Reciprocity failure

Fortunately the curiosity to understand something and the enjoyment of practical experimentation and exploration are not mutually exclusive, though some people seem to think that they are.

by Helen Bach
Replies
104
Views
11,647

### Re: Reciprocity failure

Because the different sensitive layers in a colour film can have different behaviours at low intensity, manufacturers sometimes recommended filtration as well as exposure change for long-ish...

by Helen Bach
Replies
104
Views
11,647

### Re: Reciprocity failure

Yes, it's dependedent on the illuminance* at the film plane, so dark areas depart from reciprocity more than the brighter areas for low intensity reciprocity failure/departure (but not for high...
11. ## Thread: lens perspective question?

by Helen Bach
Replies
83
Views
7,720

### Re: lens perspective question?

That's true, but DoF is not about things that are actually in focus, it's about things that only appear to be in focus: Things that are out of the focused plane, but the degree of blur is so slight...
12. ## Thread: lens perspective question?

by Helen Bach
Replies
83
Views
7,720

### Re: lens perspective question?

Strange, because I find it completely intuitive and, as BetterSense points out, quite obvious in practice. It's not necessarily 'how large it's printed', but more like 'how large it is on your...
13. ## Thread: Best lens over 240mm for landscapes in 4x5...

by Helen Bach
Replies
50
Views
8,425

14. ## Thread: 6x12 Backs - Horseman or Sinar Zoom or ?

by Helen Bach
Replies
27
Views
7,804

### Re: 6x12 Backs - Horseman or Sinar Zoom or ?

I have the Sinar Zoom 2 and Panorama. I haven't had problems with either, but I haven't used any other backs of that format to compare. It is possible to add Graflok grooves to the Zoom 2.

Best,...
15. ## Thread: Keep the Fuji 4x5 back?

by Helen Bach
Replies
32
Views
4,025

### Re: Keep the Fuji 4x5 back?

Sorry, I was writing in haste and still had the FP-3000B in mind (I think that is the material that was being discussed, but I should have been specific) - you don't need to remove the opaque backing...
16. ## Thread: Keep the Fuji 4x5 back?

by Helen Bach
Replies
32
Views
4,025

### Re: Keep the Fuji 4x5 back?

Or you can simply let the neg dry, then scan it.
17. ## Thread: Keep the Fuji 4x5 back?

by Helen Bach
Replies
32
Views
4,025

### Re: Keep the Fuji 4x5 back?

I think the FP-3000B is still widely used for technical applications - much more than it is used pictorially - so it stands a reasonably good chance of staying in production. B&H had it on sale for...
18. ## Thread: The LF Camera you have owned the longest and still do.

by Helen Bach
Replies
70
Views
11,389

### Re: The LF Camera you have owned the longest and still do.

The War Department surplus MPP S.92 I bought in about '74 as a complete kit with Wray 89 mm Wide Angle Anastigmat and 184 mm f/4.5 Lustrar lenses, MPP flashgun, War Department darkslide case complete...
19. ## Thread: digital sinar help?

by Helen Bach
Replies
6
Views
1,135

### Re: digital sinar help?

Well, there's the Sinar pSLR (link). Just the conversion parts from a P are about \$2500, I think, but it would depend on what parts you wanted. I agree with Bob - a Novoflex or RRS type of system...
20. ## Thread: Infrared Exposure Meter?

by Helen Bach
Replies
24
Views
3,648

### Re: Infrared Exposure Meter?

There were instructions about how to modify a Pentax spotmeter in an old issue of Photo Technique. The idea was to set the long end of the meter's sensitivity to the long end of HIE, using a Melles...
21. ## Thread: May 2012 Portraits

by Helen Bach
Replies
261
Views
64,036

### Re: May 2012 Portraits

http://gallery.photo.net/photo/15690756-lg.jpg

Ann

It was just an exposure test, but it turned out to be my favourite of the session. Fuji FP-100C45, Cooke PS945 at f/4.5
22. ## Thread: Speed Graphic vs MPP??

by Helen Bach
Replies
41
Views
11,328

### Re: Speed Graphic vs MPP??

So are you suggesting that the MPP Micro Technical 5x4 is neither micro nor technical?

http://gallery.photo.net/photo/8299985-lg.jpg

Best,
Helen
23. ## Thread: Microtek ArtixScan M1 Pro versus Epson Perfection V750-M Pro ?

by Helen Bach
Replies
8
Views
6,665

### Re: Microtek ArtixScan M1 Pro versus Epson Perfection V750-M Pro ?

I have an M1 Pro at home and a V-700 in the studio for draft scans. Here is an account of my early experience with the M1 Pro. I kept the M1 for scanning 8x10, which it is reasonably good at. I do...
24. ## Thread: Calibrate a transmission densitometer

by Helen Bach
Replies
32
Views
7,629

### Re: Calibrate a transmission densitometer

Would it be courtesy, however, to at least mention that the question has been asked elsewhere? When you go to a library and refer to more than one book all the effort is on the person who wants the...
25. ## Thread: Useful Bubble Level Vials

by Helen Bach
Replies
4
Views
3,139

### Re: Useful Bubble Level Vials

Second Leigh's suggestion of McMaster-Carr. I recently repaired my Voigtlander prism level with a vial from McMaster-Carr. They are a great resource that is worth knowing about.
26. ## Thread: POLL: How many users shoot large format film professionally?

by Helen Bach
Replies
28
Views
7,160

### Re: POLL: How many users shoot large format film professionally?

Reading the other replies and Kirk's comments makes me realise that I should clarify: I use LF film commercially, hence the scanning / printing method. I also sell a little of my personal work,...
27. ## Thread: POLL: How many users shoot large format film professionally?

by Helen Bach
Replies
28
Views
7,160

### Re: POLL: How many users shoot large format film professionally?

Yes, 4x5 E100G which is scanned to CMYK on an IQsmart2 for web offset printing. Nothing fancy.
28. ## Thread: Aperture to depth of field normalisation across various formats

by Helen Bach
Replies
22
Views
3,675

### Re: Aperture to depth of field normalisation across various formats

There's a lesson for us - despite the method having been mentioned twice beforehand, it was Emmanuel's version that got through.
29. ## Thread: Aperture to depth of field normalisation across various formats

by Helen Bach
Replies
22
Views
3,675

### Re: Aperture to depth of field normalisation across various formats

4x5 has linear dimensions that are half those of 8x10, therefore the equivalent focal length for the same angle of view would be half that of 8x10 - ie from 178 mm on 8x10 to 89 mm (or 90 mm if you...
30. ## Thread: Aperture to depth of field normalisation across various formats

by Helen Bach
Replies
22
Views
3,675

### Re: Aperture to depth of field normalisation across various formats

It is that easy. You can apply the much maligned 'crop factor' to both the focal length and the f-number.
31. ## Thread: d76 reversal development

by Helen Bach
Replies
10
Views
3,145

### Re: d76 reversal development

Almost always a camera negative - positive print process, often with interpositives and internegatives. The final print is made on positive release print material (high density range, clear base)....
32. ## Thread: Advantages to using a Gitzo tripod without a centerpost

by Helen Bach
Replies
9
Views
2,744

### Re: Advantages to using a Gitzo tripod without a centerpost

I use a Gitzo with a Burzynsky ball head, and my answer to Frank's good question is that the shorter distance between the leg hinges and the bottom of the camera reduces, however slightly, the moment...
33. ## Thread: Nice guy, that David Bailey bloke

by Helen Bach
Replies
10
Views
3,153

### Re: Nice guy, that David Bailey bloke

I met him a few times in the 70's, although 'met' is a gross overstatement for what would have been not much more than a 'Hello' and a smile - I was extremely shy back then. He was a funny,...
34. ## Thread: tungsten vs strobe lighting

by Helen Bach
Replies
39
Views
13,320

### Re: tungsten vs strobe lighting

Remember that as you dim an incandescent lamp the peak wavelength gets longer (ie the light gets redder) so you are probably reducing the actinic efficiency of the lamp and thus you are likely to get...
35. ## Thread: E6 lab for 120 and 4x5 film?

by Helen Bach
Replies
15
Views
5,752

### Re: E6 lab for 120 and 4x5 film?

It's not everyone's top choice in NYC by any means: I find them to be snotty and not all that helpful or trustworthy in comparison to other labs. I would recommend Ken Lieberman, LTI Lightside and...

by Helen Bach
Replies
9
Views
1,762

### Re: Arca Swiss (110) to Linhof Technika adapter

The current SK Grimes one looks different - my guess is that it is entirely machined from scratch instead of being fabricated from an existing lens board. It was about \$200, I think - I can't find...

by Helen Bach
Replies
9
Views
1,762

### Re: Arca Swiss (110) to Linhof Technika adapter

OK, I've replied to your PM.

by Helen Bach
Replies
9
Views
1,762

### Re: Arca Swiss (110) to Linhof Technika adapter

darr has answered your question, but just in case you are ever in NYC (Tribeca) and want to see one (ie an SK Grimes one) you would be welcome to drop by the studio.

Best,
Helen
39. ## Thread: A question on hypefocal distances.

by Helen Bach
Replies
31
Views
4,170

### Re: A question on hypefocal distances.

Thanks for the reply. I often find it difficult to judge the appropriate way to reply to questions - is it too much, is it too little, is it too vague, does it require too much self-assembly...
...
40. ## Thread: A question on hypefocal distances.

by Helen Bach
Replies
31
Views
4,170

### Re: A question on hypefocal distances.

So you don't think that it was worth mentioning the two different practices at all? I often ask myself if there is any real point in answering questions on the internet.

Best,
Helen

PS The...
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