Photographic Series
20R
Belonging to the ISO paper size standard, 20R is a unique and intriguing dimension. This particular size, measuring 508mm by 610mm, is part of the R series that deviates from the more commonly known A and B series. The R series is specifically designed to cater to photography and print industries, with 20R being one of its larger sizes.
The ISO (International Organization for Standardization) developed this system to streamline paper sizes globally. The R series within this system stands out due to its aspect ratio which differs from the √2 ratio found in A and B series. This deviation allows for optimal enlargement and reduction between sizes within the R series without distortion or loss of content.
20R paper dimensions
Specs
| Format | in | mm | cm | pt |
|---|---|---|---|---|
| 2A0 | 46.81 x 66.22 | 1189 x 1682 | 119 x 168 | 3370 x 4768 |
| A12 | 0.51 x 0.71 | 13 x 18 | 1 x 2 | 37 x 51 |
| 4A0 | 66.22 x 93.62 | 1682 x 2378 | 168 x 238 | 4768 x 6741 |
| A11 | 0.71 x 1.02 | 18 x 26 | 2 x 3 | 51 x 74 |
| A10 | 1.02 x 1.46 | 26 x 37 | 3 x 4 | 74 x 105 |
| A3+ | 12.95 x 19.02 | 329 x 483 | 33 x 48 | 933 x 1369 |
| A1+ | 23.98 x 35.98 | 609 x 914 | 61 x 91 | 1726 x 2591 |
| A0+ | 35.98 x 50.87 | 914 x 1292 | 91 x 129 | 2591 x 3662 |
| A6 | 4.13 x 5.83 | 105 x 148 | 11 x 15 | 298 x 420 |
| A5 | 5.83 x 8.27 | 148 x 210 | 15 x 21 | 420 x 595 |
| A4 | 8.27 x 11.69 | 210 x 297 | 21 x 30 | 595 x 842 |
| A3 | 11.69 x 16.54 | 297 x 420 | 30 x 42 | 842 x 1191 |
| A9 | 1.46 x 2.05 | 37 x 52 | 4 x 5 | 105 x 147 |
| A2 | 16.54 x 23.39 | 420 x 594 | 42 x 59 | 1191 x 1684 |
| A8 | 2.05 x 2.91 | 52 x 74 | 5 x 7 | 147 x 210 |
| A1 | 23.39 x 33.11 | 594 x 841 | 59 x 84 | 1684 x 2384 |
| A7 | 2.91 x 4.13 | 74 x 105 | 7 x 11 | 210 x 298 |
| A0 | 33.11 x 46.81 | 841 x 1189 | 84 x 119 | 2384 x 3370 |
Interestingly, while most other countries adhere strictly to ISO standards, North America often uses ANSI (American National Standards Institute) standards instead. However, in the case of photographic print sizes such as 20R, both regions align with ISO's R Series.
Despite its less common usage compared to A4 or Letter size papers, 20R holds a significant place in specialized fields like professional photography and printing. Its large dimensions make it ideal for creating impactful visual displays or high-quality prints that require greater detail resolution.
While it may not be your everyday paper size choice like A4 or Letter size papers are; when it comes to professional photography or printing needs where detail resolution matters most - there's no overlooking the value that a larger format like 20R brings.
Other Formats in the Photographic Series
Interesting facts about 20R
1: The Origin of 20R Paper
20R paper is part of the R series, which originated in Japan. The "R" stands for "raw," referring to the untrimmed size of the paper.
2: Dimensions of 20R Paper
The dimensions of 20R paper are approximately 508 mm x 762 mm (20 inches x 30 inches). It falls under the category of large-format paper.
3: Common Uses
Due to its larger size, 20R paper is commonly used for printing posters, artwork, and promotional materials that require a significant visual impact.
4: Variations in Weight
The weight of 20R paper can vary depending on its purpose. It is available in various weights such as lightweight for easy handling or heavyweight for durability.
5: Compatibility with Printing Techniques
20R paper works well with both digital and traditional printing techniques. Its large size allows for detailed prints without compromising quality.
6: Historical Significance
The R series sizes were introduced by Japan's Ministry of Education in the early twentieth century as part of their metrication efforts to standardize paper sizes across industries.
7: Global Adoption
The R series sizes gained popularity not only in Japan but also internationally. Many countries have adopted these sizes alongside their own traditional or metric-based standards.
8: Similarity to ISO B Series
The dimensions of the R series papers are similar to those found in the ISO B series. For example, both A3 and B3 papers have dimensions close to 20R paper.
9: Availability in Different Colors
20R paper is available in various colors, allowing for creative and eye-catching designs. This feature makes it a popular choice for artistic projects and presentations.
10: Environmental Considerations
When choosing 20R paper, it is important to consider its environmental impact. Opting for recycled or sustainably sourced options can help reduce the ecological footprint associated with paper production.
