Delta: The Alt-Lens Archive
Delta is the largest catalogue of enlarger, project, industrial and non-standard macro lenses available online, now comprising almost 4,000 entries.
You can navigate to individual listings by browsing product images or setting search filters. On this page, you can filter the database globally. On category pages (for instance ‘Enlarger Lenses’) the filter operates on a single lens type. Primary filters allow you to find an alt.lens of a given focal length or maximum aperture – but they also allow you to combine searches to find lenses of a specific aperture type, or number of lens elements. The ‘Helical Extension’ filter subtracts the Focal-Flange Distance of the lens from the typical 20mm register distance of modern digital cameras, to let you know the correct depth of helical needed to obtain infinity focus.
Please select a type of lens below, or explore filtered global searches using the magnifier tool.
Elements / Groups
- 0 1950-1974
- 0 2 / 1 / 1
- 1 6 / 3
- 2 7 / 7
- 4 2
- 286 3 / 3
- 11 3 / 2
- 144 3 / 3
- 232 4
- 54 4 / 2
- 220 4 / 3
- 66 4 / 4
- 66 5
- 87 5 / 3
- 44 5 / 4
- 2 5 / 5
- 157 6
- 5 6 / 2
- 523 6 / 4
- 7 6 / 5
- 32 6 / 6
- 50 7
- 6 7 / 4
- 5 7 / 5
- 11 7 / 6
- 6 8
- 8 8 / 4
- 18 8 / 5
- 8 8 / 6
- 3 8 / 8
- 5 9
- 1 9 / 5
- 3 9 / 7
- 1 10
- 8 11
- 2 11 / 10
- 1 12 / 4
- 1 12 / 9
- 1 13 / 8
- 1 14 / 6
- 2 15
- 1 17 / 12
Aperture Type
- 13 15 (Scalloped)
- 1640 Fixed/None
- 415 Circular
- 2 3 (Curved)
- 10 4 (Curved)
- 14 4 (Straight)
- 68 5 (Convex)
- 186 5 (Curved)
- 7 5 (Straight)
- 18 6 (Curved)
- 54 6 (Straight)
- 7 6 (Scallop)
- 5 7 (Curved)
- 14 7 (Straight)
- 14 8-Blade
- 28 8 (Curved)
- 4 8 (Scallop)
- 160 8 (Straight)
- 22 9 (Curved)
- 3 9 (Straight)
- 1 9 (Scallop)
- 125 10 (Circular)
- 3 10 (Scallop)
- 2 10 (Straight)
- 3 11 (Circular)
- 1 11 (Straight)
- 47 12 (Circular)
- 3 12 (Scallop)
- 3 12 (Straight)
- 12 14 (Circular)
- 27 15 (Circular)
- 28 16 (Circular)
- 6 16 (Scallop)
- 1 18 (Circular)
