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Ricoh Ricoh is offline
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Re: Pinhole digital photography

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Originally Posted by BTaberham View Post
As far as pinhole photography on m43 goes, the ones which use a modified body cap have quite a long effective focal length.

What is interesting is that this was actually addressed by a pinhole lens with a recessed pinhole called the PinWide which was specifically produced for micro four thirds a while back and is reviewed below:

The Phoblographer

I do actually have one in the cupboard somewhere - this makes me want to dig it back up!
Thanks for this, looks like fun indeed.
I have another tab open looking for a UK source.
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  #17  
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Jim Ford Jim Ford is offline
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Re: Pinhole digital photography

A few years ago I made a pinhole camera out of card. I used a piece of drinks can for putting in the pinhole, and used a formula for the pinhole size from an encyclopedia. The 'plate' size was A5.

I exposed onto an A5 piece of photographic paper and developed it. I then carefully peeled the emulsion layer off to produce a negative that I used to contact print onto another piece of paper to give a positive. It worked quite well.

Jim
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Re: Pinhole digital photography

I do remember those days, not the pinhole, but using the toilet roll cardboard roll as a lens extension tube. Dodgy but innovative results...……...

Zenith 35mm Camera I think...………….
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Re: Pinhole digital photography

Looks like I'm a bit late to the Wanderlust Pinwide Kickstarter - like hen's teeth unfortunately.
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Re: Pinhole digital photography

IIRC the focal length of a pinhole is determined by it's distance to the sensor.

Somewhere I have details of the optimum diameter based on focal length & light wavelength - I'm pretty sure they're at work (& I'm not).
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Re: Pinhole digital photography

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Originally Posted by Petrochemist View Post
Somewhere I have details of the optimum diameter based on focal length & light wavelength - I'm pretty sure they're at work (& I'm not).
I got mine from a 'Focal Encyclopedia of Photography'.

Jim
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Re: Pinhole digital photography

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I got mine from a 'Focal Encyclopedia of Photography'.

Jim
Probably where originally I got mine from then. - I have both the desk edition & now a larger 2 part version.
Quite a lot in it of limited interest but loads of gems as well!
When I come across the gems I tend to transfer them to my photography reference spreadsheet.
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Re: Pinhole digital photography

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Originally Posted by Ricoh View Post
That Holga looks fun, pure 100% plastic as well. You've got me tempted and I can see an order transaction very soon.
(What turned me off digital was exactly what you said, the clinical sharpness of super sharp lenses. There has been discussion about the lack of quality of M4/3 compared to other systems, DR etc, but for me M4/3 is more than good, meaning it's too good, I want degraded images like they've been shot through the bottom of a beer glass.)
The holga is fun. You get a lovely nostalgic feel to the images. Obviously nothing is sharp and the "aperture" is quite slow so you're limited in what works.
The focus on the Holga is very stiff. On my E-M10 Mkii the lens mount/lens is a bit off and sometimes it twists off despite the lock button.
It works OK on my E-PL5 so it's not a problem but worth knowing.

I tend to set the the camera to Medium JPG + RAW and 1:1 format. That way you get the 1:1 for framing on the screen/VF and the JPG but you still have the full sensor RAW to play with later if you want.
For less than the cost of an Olympus lens cap I've had a lot of fun with it.

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Can I ask regarding the body cap you've ordered, does that come pre-engineered with a small hole required for pinhole, eg f/300. In the article referenced in the OP it talks about inverted caps for wide angle effect.
No, I bought a regular body cap with a view to adapting it as per the article. Holga also do a pin hole lens (check eBay/Amazon) but I fancy trying to do it self - that way I can experiment with different pinhole sizes.
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  #24  
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Re: Pinhole digital photography

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I want degraded images like they've been shot through the bottom of a beer glass.
I believe that the Mk1 standard Canon kit lens was the classic beer bottle bottom!

Jim
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Re: Pinhole digital photography

One of the things on my to-do list is to invert the front element of a manual focus lens. The results are unusual and definitely not sharp, but quite appealing with an old-world analogue feel to them. Lots of cheap Russian lenses available for buttons, probably the best candidates for job.
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Re: Pinhole digital photography

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Originally Posted by Jim Ford View Post
I believe that the Mk1 standard Canon kit lens was the classic beer bottle bottom!

Jim
I think I've got one of those too (it could be a slightly later model but definitely film era EOS).
I tend to try all sorts of 'lenses' to create images but I never bothered mounting this. I'm sure beer bottles would be better!
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Re: Pinhole digital photography

My body cap arrived this morning, I'd not noticed that my 99p bought me a body cap and a rear lens cap! (eBay item number: 253527086294)
Ordered on the 20th took 10 days from China. My experiment costs 49.5p + my time.


First thing was to find the middle of the cap.
I rubbed a bit of paper over then inside of the cap to trace out the inner cap diameter, cut that into a circle and test fitted it inside the cap.
That gave me a template which I folded into quarters then used the join to indicate the centre.
I then marked through the paper to give the drill a centre.
There's probably a better way to do this so feel free to make suggestions.
I drilled a 3mm hole - very simple using my knock off dremel like tool.

Then the fun begins.
I decided to try electrical tape to begin with as faffing with drinks cans sounded like it would be fiddly and slow.
Getting the smallest possible pin hole and trying to get that hole perfectly in the middle was a challenge.
Once you've stuck the tape down it's not really practical to peel it off and move it.
Ironically my first attempt was the best of the tape versions, I then tried several more goes with less success!

I tried tape on the inside and the outside, supporting the tape with a cork or a guitar pick to try and get the smallest hole.
Then I decided to try a cardboard cut out pushed into the cap.
I then held a guitar pick behind that and pushed the pinhole from the front.
Finally using the rear screen I was able to rotate the card so there was no interference from the 3mm hole.
In certain versions there were shadows that were clearly the edge of the drill hole.

It is possible to see a blurry image on the rear screen with the body cap on and no pin hole.
Now I think about it it might be a way to align a "perfect" tape pinhole.
Something for another day.


The kit


Bodycap adapted for pinhole photography by AMcUK, on Flickr


Pinhole Bodycap Close Up by AMcUK, on Flickr

My 'lens' is about 25mm (50mm equivalent) based on framing the church with the kit lens.

The E-M10 Mkii does a very impressive job of boosting the EVF/Screen to show you what you're likely to get so it's not quite "shooting in the dark".
As the weather is rotten today I just propped the camera on the window for the church shots.
Shooting in manual ISO 200 some of my shots went to 30 seconds but they weren't any better than the 3-5 second versions.
The gorilla and selfie were hand held in P mode - so a max of 1 second and ISO 3200.

JPG Straight out of camera - resized for the web


St. Mary's Digital Pinhole - Out of Camera by AMcUK, on Flickr


St. Mary's Digital Pinhole - Out of Camera by AMcUK, on Flickr


Digital Pinhole Portrait - Out of Camera by AMcUK, on Flickr


Gerald Digital Pinhole - Out of Camera by AMcUK, on Flickr



Auto adjusted in Lightroom


St. Mary's Digital Pinhole - Lightroom by AMcUK, on Flickr


St. Mary's Digital Pinhole - Lightroom by AMcUK, on Flickr


Digital Pinhole Portrait - Lightroom by AMcUK, on Flickr


Gerald Digital Pinhole - Lightroom by AMcUK, on Flickr


So a fun experiment for 50p. If the sun comes back I might go out and see what else I can do with it.
Any thoughts or questions feel free to chip in.
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  #28  
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Jim Ford Jim Ford is offline
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Re: Pinhole digital photography

Quote:
Originally Posted by AMc View Post
First thing was to find the middle of the cap.
I rubbed a bit of paper over then inside of the cap to trace out the inner cap diameter, cut that into a circle and test fitted it inside the cap.
That gave me a template which I folded into quarters then used the join to indicate the centre.
I then marked through the paper to give the drill a centre.
There's probably a better way to do this so feel free to make suggestions.

The classic way to find the centre of a circle is to use 'odd leg calipers':

https://www.wonkeedonkeetools.co.uk/...f-a-workpiece/

Jim
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  #29  
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Re: Pinhole digital photography

Quote:
Originally Posted by Jim Ford View Post
The classic way to find the centre of a circle is to use 'odd leg calipers':

https://www.wonkeedonkeetools.co.uk/...f-a-workpiece/

Jim
No compasses to hand, let alone calipers! Though the technique is new to me so thanks
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Ricoh Ricoh is offline
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Re: Pinhole digital photography

Quote:
Originally Posted by BTaberham View Post
As far as pinhole photography on m43 goes, the ones which use a modified body cap have quite a long effective focal length.

What is interesting is that this was actually addressed by a pinhole lens with a recessed pinhole called the PinWide which was specifically produced for micro four thirds a while back and is reviewed below:

The Phoblographer

I do actually have one in the cupboard somewhere - this makes me want to dig it back up!
Ok, I need, or perhaps I should say more accurately 'I want' a PinWide.

Anyone wishing to divest themselves please let me know. Or if anyone finds a supplier, please advise.
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