Photographic filters size



photographic filters

All kinds of photographic filters divesity

Brief guide about filters commercial size

Photographic filters size



This brief guide is an overview about the filters commercial dimensions. At present photographic filters are proposed in three variations:

  • Circular filters
  • Square filters
  • Rectangular filters


Photographic circular filters



Photographic circular filters consist in a metallic ring very thin and with the threaded outer diameter. The ring has fit a colored disc of glass or resin in the inner diameter. The outer diameter own a standard thread profile to match mainly with reflex camera lens. The threaded profile is made according the ISO standard, thus in metric dimensions and the most common diameters are the follows: 30,5mm, 35,5mm, 37mm, 39mm, 40,5mm, 43mm, 46mm, 49mm, 52mm, 55mm, 58mm, 62mm,67mm, 72mm, 77mm, 82mm, 86mm, 95mm, 105mm, 112mm 122mm, 12 mm, while the thread pitch can be 0,5mm, 0,75mm o 1,0mm, this huge range of thread profiles suggest a control of the thread profile available on the camera lens before shopping one. Fortunally, exist also the adapter rings to mount filters with a different thread than the camera lens. The adapter ring own a male thread profile that match the thread in the camera lens and own a female thread profile that match the thread in the filter, these threads combinations are innumerable and depends by the adapter ring manufacturers. Auloma doesn't produce this kind of filters.

photographic circular filters
"Photographic circular filters"


Photographic square filters or slot in filters


Photographic square filters, also called slot-in filters, consist in a sheet of glass or methacrylate studied to be slide into two slots into the filter holder. The overall dimensions of the square filter are standardized only for the inches versions, while for metric version each manufactures offers own variations. In the past the filters with dimension in inches was widespread and was the follow:

  • 2”x2”
  • 3”x3”
  • 4”x4”

Nowadays are preferred square filters with dimension in millimeters such as the follows:

  • 67x67mm
  • 84x84mm
  • 85x85mm
  • 100x100mm
  • 130x130mm
  • 150x150mm
  • 180x180mm

The filter size 100x100mm is common at all manufacturers, this size is very close to the inches version of 4"x4. This dimensional proximity makes that many filter holders manufacturers, use system capable to adjust this small difference between the two sizes, in this way will be possible mount in the same filter holder the 100x100mm and the 4"x4". Auloma produces only one size of square filter and this is the 100x100mm tha was developed to be installed also on our pinhole camera Panorama 6x12.



Square photographic filters
"Square photographic filters Aulomacolor for black and white photography."


pinhole auloma panorama with photographic filter
"Pinhole Auloma Panorama 6x12 with photographic filters istalled."

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Rectangular photographic filters


Rectangular photographic filters are similar at square filters, are the same sheet of glass or in methacrylate only more long, are mounted in the filter holder using the same slot-in system , for this reason rectangular filters and square filters own the same width. For rectangular filters the width more common are the follow:

  • 67mm
  • 84mm
  • 85mm
  • 100mm
  • 130mm
  • 150mm
  • 180mm

The length of the rectangular filter vary and depends by the the filter use, for example, graduated filters own a gradient coloration that start from transparency until the maximum of color intensity, this filter allow who use digital camera to find the just tone of color with a simple operation, is enough sliding the filter in front the camera lens. Another use of rectangular filters is when in your camera is mounted a wide angle lens in this way the filter doesn't vignetting your photo. To satisfy the exigences of photographers enthusiast of the wide angle photography, Auloma has developed the rectangular filters size 130x170mm.

photographic rectangular filters
"Photographic rectangular filters Aulomacolor for black and white photography"


pinhole magnificat 4x5 with photographic filter
"Pinhole Auloma Magnificat 4x5 with ND photographic filter."

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