Macro-photography

[Anonymous]

Posted by Michael Gilligan on 27/04/2022 05:19:30:

Posted by Peter Greene 🇨🇦 on 27/04/2022 01:26:18:

Michael, do the lens axes intersect at the focus or is there a slight gap between them at that plane?

.

They intersect, Peter

Thanks, Michael. I was just looking into the geometry I'd need when modifying my camera. Then I realised that it doesn't really matter anyway since I have independent control over the object distance and the focussing of the lenses. So I can set up anything I want at the picture-taking stage.

(If that makes sense).

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, the Canon 400D camera that I bought the other day, came this morning, so after checking it out I set it up with my original one and gave it ago for a stereo pair on my No. 4 Denbigh Fly-press and the first attempt looks good through my Owl VR stereoscope, works OK for me with the parallel free view as well. Top photo for parallel viewing and bottom for cross viewing.

Regards Nick.

P.S. I've got two different pictures this time Sam. 

Edited By Nicholas Farr on 27/04/2022 21:43:48

[Sam StonesParticipant @samstones42903]

So I see Nick … with eyes crossed.

Thanks for your input and others for a most entertaining thread.

Cheers,

Sam

[Michael GilliganParticipant @michaelgilligan61133]

Parallel free-viewing works nicely for me, Nick

MichaelG.

[Sam StonesParticipant @samstones42903]

A couple of years ago (22nd May 2020), soon after Raphael’s thread became piggybacked with 3D images, I experimented with views from my skeleton clock CAD files.

For reference, look towards the end of … **LINK**

I noted then that a five-degree rotation of the CAD image seemed to work.

Before my enthusiasm faded, I messed about with a pair of plastic-coated paperclips that I could rotate five degrees. Photographed through a 100mm Macro on my Canon 300D here is the result for parallel and crossed viewing.

It’s quite clear that I could also have skewed the clips themselves to increase the 3D effect. Instead, I gave preference to depth of field.

Clearly, although only one camera is necessary, this (table-top) method is only suitable for static objects. I certainly look forward to your two-camera results Nick. My thoughts about synchronised shutters were more to do with if and when you turn your attention to animated objects.

Cheers,

Sam

[Nicholas FarrParticipant @nicholasfarr14254]

Hi MichaelG and Sam, it's good to know you can satisfactorily view my Fly-press pair. I like your paper clip idea Sam, but at first I was confused as to which one was the parallel view one, as they both appeared to be in 3D although with them being opposite, upon closer inspection though, I could see that the left hand end of the blue one in the bottom view, was trying to look as if it was pushed slightly backwards but is actually obscuring part of the foldback going to the right hand end, near the bottom of the left hand end, which of course means this must be the cross view one. So apart from them being opposites, that's such a subtle difference.

Regards Nick.

Edited By Nicholas Farr on 28/04/2022 12:45:51

[Sam StonesParticipant @samstones42903]

Spot on, Nick.

Although I tried to stay with the current (unwritten) convention seemingly adopted earlier, i.e., parallel at the top and crossed underneath, I was rather mischievous in withholding their identities.

Not knowing if those with a ‘predilection’ for parallel viewing can see in the blink of an eye, which is which, it suggests to me that crossed viewing has a slight edge.

Did you notice the longitudinal split in the plastic? It’s just under the lower loop of the red clip. Beside some dust, there's also a whisker … top right on the red clip.

Cheers,

Sam

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Sam, no I didn't spot the split or the whisker, but there again I wasn't looking for anything like them. Having another look, I see the split but I had to use my stereoscope to see the whisker and it shows up better in the cross view one.

Regards Nick.

[Sam StonesParticipant @samstones42903]

Nick said … it shows up better in the cross view one.

That's curious Nick. I might presume an eye imbalance, which is very likely with my faltering right eye.

Cheers,

Sam

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, a few weeks ago I bought a second hand Canon IXUS170 compact camera off ebay for a very nice price. This together could then be used on my twin camera bracket that I finished yesterday.

All that was needed was something to try them out on, so I got a bit adventurous which would really push the limits, that something had unpredictable movement within its self if left not touched. I wasn't sure if it was at all possible but the result on a first attempt were very much what I had hoped for, now I'm not saying it was perfect and I think the angle between the two cameras was slightly too much, but the stereo pair works well for myself, both in free view and with my stereoscope. The top pair are the parallel view and the bottom pair are cross view.

 

 

 

Hope they work for anyone who likes stereoscopic pictures.

Regards Nick.

Edited By Nicholas Farr on 16/06/2022 12:19:01

[Sam StonesParticipant @samstones42903]

Hi Nick,

I for one am impressed with your latest work and your determination to pursue even better results. For me, the corona(?) movement is blurry as expected and would be – should I say – impossible to capture without synchronised exposures.

Keep up the good work.

Sam

[Jon LawesParticipant @jonlawes51698]

I do enjoy the diversity of projects on this forum. Fantastic stuff.

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Sam, thanks for your comment. I didn't know if these would work given how fast the plasma streams move and dance around and yes the corona is blurry when you watch it in action. You are correct, in that a synchronised exposure is essential, but although this was a first attempt at making a stereo pair with this plasma light, I took three shoots, the first shoot the cameras were not close enough and the second shoot only the right hand camera fired. I used the self timers on the cameras and pressed both buttons at the same time, which eliminates any movement on the cameras that my figure actions may impose, but it does show how good the timers in the cameras are, and the serial numbers of both being a difference of 4219. The shutter count on the second hand camera is currently 6098 higher than my own original camera.

Regards Nick.

[Michael GilliganParticipant @michaelgilligan61133]

That’s a very effective result, Nick … and an inspired choice of subject !

To do any better, I’m pretty sure you would need a pair of ‘global shutter’ cameras

… but would the ‘accuracy’ then diminish the artistic effect, I wonder.

MichaelG.

[Nicholas FarrParticipant @nicholasfarr14254]

Hi MichaelG, had to look up about global shutter cameras as it's the first time I've heard of them and yes I can understand the difference that they may make, but I think the price of one let alone two, may be outside my budget that I would want to pay right now. I did wonder if my experiment would even be successful, given the nature of the speed of things, but I was very pleased with the result. I guess such cameras could diminish the artistic effect as you say and may make the pictures look too clean, but probably would be good for a serious study of the events.

Regards Nick.

[egaParticipant @ega]

This BBC video may be of interest – macro photos of insects by a Welshman with interesting equipment:

https://www.bbc.co.uk/news/av/uk-wales-south-west-wales-62425367

[Michael GilliganParticipant @michaelgilligan61133]

I happened across this image yesterday: **LINK**

https://viewer.gigamacro.com/view/D8vGZi3Isr7gwZ0A?x1=37805.00&y1=-25279.00&res1=98.45&rot1=0.00

 

Not much to be impressed by when the page opens … but try zooming-in !

I feel sure I shall find some practical uses for screen-shots of it.

The rest of the site is worth browsing too

MichaelG.

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Edited By Michael Gilligan on 05/09/2022 09:50:14

[Bill Davies 2Participant @billdavies2]

That's amazing, Michael. Made up from so many photos stitched together.

What size printer could print it out?

Bill

[Michael GilliganParticipant @michaelgilligan61133]

Beyond comprehension, Bill

… but what I will probably do is use it as a source for screen-shots of the individual elements, which the iPad will do at a decent resolution.

MichaelG.

.

Edit: __ for example: I have just done this, and converted it from png to jpg for the forum

… which should print nicely on A4 

Edited By Michael Gilligan on 05/09/2022 10:02:40

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, yesterday after mowing my lawns, and being it was quite a blustery day, I tidied up some small tree branches, where upon I found several Conkers had also been blown down, which reminded me of childhood days of looking out for conkers and having Conker challengers with my siblings and with school mates at playtimes. (I lost mostly) Having collected quite a few up, I though the collection would make a good Stereoscopic pair. So below is a parallel view first and a cross view second.

See what you think.

Regards Nick.

[Michael GilliganParticipant @michaelgilligan61133]

Very effective, Nick

MichaelG.

[ a parallel viewer ]

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, MichaelG, thanks, I was a little concerned whether this would work, as it wasn't until, I posted them here, that I noticed one image has been cropped slightly wider than the other, but both the views worked OK for me, although the cross view one looks muddled, as they normally do for me.

Regards Nick.

Edited By Nicholas Farr on 06/10/2022 10:21:22

[mark costello 1Participant @markcostello1]

I believe We call them Buckeyes over here, in the Buckeye State (ohio).

[sam sokolikParticipant @samsokolik60334]

been really impressed with my pixel phone… (4a 5g)

[CarlParticipant @carl48656]

Conkers ! that brings it all back… I tried pickling in vinegar, baking in the oven, ageing in the airing cupboard, all kinds of hocus locus but never could get that unbeatable smasher…

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