Within the latest DIY Perks challenge, Matt constructed a big format digicam utilizing an previous episcope lens that produces the identical outcomes as a 35mm f/0.4 lens (full-frame equal) for the whole value of $190.
Matt from the Youtube channel DIY Perks is certainly a really artistic man. We featured his work beforehand – you may bear in mind when he made the Canon EOS R5 document 8K uncooked with none restrict by swapping the digicam’s inside warmth sink along with his personal higher design. This time Matt determined to create a big format digicam (or a VERY quick lens – relying on the way you take a look at it) and the ensuing footage seems distinctive.
It’s all about shallow DoF
The chase for shallow depth of discipline that ends in the blurry background filled with bokeh and helps separate the topic and provides the viewer a way of depth has all the time been part of the filmmaker’s (and naturally photographer’s) life. Though a shallow depth of discipline alone doesn’t assure a pleasant outcome, it is without doubt one of the instruments that’s supposed to assist inform the story and make the pictures extra interesting.
If I simplify issues a bit, there are principally two methods on (optically) attain a shallower depth of discipline with a given angle of view (and a hard and fast topic distance to the digicam):
- Bigger “sensor” – Bigger sensor (or projection airplane) permits us to make use of an extended focal size lens to achieve the specified angle of view. Due to how a lens works, an extended focal size lens (with the identical aperture) produces shallower depth of discipline.
- Sooner lens – The quicker the lens is (or the decrease the aperture worth is), the shallower depth of discipline we are able to get. Reasonably priced affordable customary are prime lenses with f/1.4 aperture on a full-frame sensor. There are quicker lenses, however each cease quicker than f/1.4 normally comes with a really excessive value. There are additionally bodily limitations – one of many quickest full-frame prime lenses ever made is the Carl Zeiss 50mm f/0.7 which is a really costly piece of glass.
The primary possibility that makes use of bigger projection circle (bigger “sensor”) is extra attention-grabbing, as there are lots of inexpensive classic specialty lenses that permit for attention-grabbing outcomes.
Actually, we already reported a couple of comparable DIY challenge in 2018 when filmmaker Zev Hoover constructed a big format digicam. Matt’s challenge works equally, however his setup is a bit neater and extra sensible for my part.
Episcope projection lens
The lens that Matt used for his challenge is an previous Episcope 432mm f/5 lens that was utilized in early projection gadgets to challenge a light-weight bounced off of actual objects. This large lens produces an enormous picture circle of round 500mm in diameter. For reference, trendy giant format cine lenses produce picture circles with a diameter of round 46mm.
The problem right here is seize the entire picture circle. There are clearly no digital picture sensors that might seize such a big picture. The concept Matt used for his challenge is to place a skinny semi-transparent display screen within the projection airplane of the lens, after which seize the picture on that display screen from the opposite aspect with any digicam.
Images diffusion sheet is the fabric Matt went with, because it has fairly a superb construction and becoming traits for this function. The sheet was then sandwiched between two items of acrylic glass. Within the strategy of building, Matt came upon that the picture on the diffusion sheet confirmed heavy vignetting, so he had to make use of two flat Fresnel lenses to direct the sunshine rays in the direction of the digicam on the again.
The subsequent enchancment to the digicam’s design was making a mechanical focusing system to have the ability to exactly change the main target. Matt used two threaded rods related with a low-rpm motor and to be trustworthy, it seems fairly neat and appears to be working very properly.
Lastly, to dam undesirable gentle from getting into the lens system from the aspect, Matt made a brief bellow sleeve from black paper.
I’ve to confess, I’m very impressed by the ensuing clips and the look of the shallow depth of discipline photographs that Matt captured for the video. This entire system transforms this Episcope 432mm f/5 lens right into a 35mm f/0.4 due to a crop issue (relative to full-frame) of 0.08x.
Worth and availability
As this can be a DIY challenge, this sort of machine will not be being bought commercially, in fact. For these of you who’re, like me, tempted to construct such a tool yourselves, Matt promised he’ll put collectively a package deal with designed fashions for all of the 3D-printed components, all of the measurements, and so forth. On the time of writing the article, this was, nevertheless, nonetheless not obtainable. Let’s hope Matt will embrace the hyperlink as quickly as potential. The opposite important gear is, in fact, a becoming Episcope lens, which could truly be a bit troublesome to get.
The whole value of the fabric for this challenge is, in accordance with Matt, round $190. This may, nevertheless, depend upon the value of the lens. I can think about the costs of comparable lenses went considerably up after Matt launched the video.
What do you consider the DIY Perks’ newest challenge? Are you tempted to construct this your self? Tell us within the feedback part beneath the article.