Pentax Close-up Accessories

Pentax Close-up Accessories

SMC Close-up Lenses

Similar to a filter, a close-up lens is screwed into the filter thread of a lens. Without light loss, it reduces the minimum focus distance of the lens and increases the magnification ratio.

The names of the Pentax close-up lenses are made up as follows:

  • S – to be used with standard lenses
  • T – to be used with telephoto lenses
  • n – focal length of the optical element (in cm). It gives the distance from film to subject when the lens to which the close-up lens is attached to is focused at infinity. It can be converted to diopters d as follows: d = 100 / n.

The Pentax close-up lenses are listed in the Table 1. The ones with the larger diameters are the older versions, designed to fit the filter threads of the K-series lenses.

Close-Up LensDiameter (mm)Use With Lenses with f (mm)If Used WithSubject Distance (cm)Magnification
S2549, 525050/1.732.6 ~ 221/4.8 ~ 1/2.7
S4049, 525050/1.748 ~ 271/7.6 ~ 1/3.5
T8049, 5285 ~ 15085/291.6 ~ 50.51/9.4 ~ 1/4.2
T9552, 58135 ~ 200200/4111.7 ~ 80.31/4.96 ~ 1/2.61
T16049, 52100 ~ 150135/3.5174.2 ~ 79.11/12.3 ~ 1/4.31
T18352, 58135 ~ 200200/4200 ~ 1081/9.5 ~ 1/3.77

Dental Close-up Lens Set

This set is meant to be used in combination with a ring flash and a Dental Macro lens (see the diagram). It consists of two close-up lenses (DS9 and DS25) and a magnet holder. DS9 has a yellow painted ring around it, and DS25 has a red one. Both names follow the close-up lens naming convention explained above, with the addition of "D" for "dental."

There are two Dental macro lenses, the SMC-M Dental Macro 100 mm f/4 and the SMC-A Dental Macro 100 mm f/4. The only difference between these two lenses and the respective non-dental ones are the additional yellow and red magnification ratio markings that correspond to the use of the two close-up lenses.

Extension Tubes

Extension tubes are mounted between the camera and the lens. They increase the distance between the two, thus allowing closer focusing and therefore a higher magnification ratio. The longer the extension, the closer the distance to the object.

The following extension tubes are available:

Tube NameLength
Auto Extension Tube K50 mm
Auto Extension Tube K100 mm
Helicoid Extension Tube K manual diaphragm operation26 ~ 46 mm
Manual Extension Tube Set K manual diaphragm operation9.5, 19, 28.5 mm
Auto Extension Tube Set K12, 19, 26 mm

Pentax does not offer AF-capable extension tubes, although some of the 3rd party manufacturers do.

nice macro setup: LX, bellows, bellows lens, double release cable

Bellows, etc.

  • The auto bellows (identical with auto bellows M and auto bellows A) can be extended 38 mm ~ 170 mm. It has a lens reversing system, automatic diaphragm, double cable-release, an extension measuring scale, and a moving tripod mount. (The image shows the auto bellows A together with the slide copier A.)
  • The bellows unit III manual-aperture operation has an extension range 32 mm ~ 137 mm and a moving tripod mount.
  • The slide copier A/M attaches to the auto bellows, and can be used for copying slides at magnifications from 1:1 to 1.5:1. (The image shows the auto bellows A together with the slide copier A.)
  • The slide holder 1X K holds a slide so it can be duplicated.
  • The slide holder K holds a slide so it can be copied at magnifications between 1:1 and 1.15:1.
  • The macro focus rail III has a tripod receptacle and allows fine focusing by moving the entire camera-extension tube-lens assembly back and forth. This allows keeping a pre-determined magnification ratio constant.

Reverse Adaptor K

Reverse adaptors manual-aperture operation are used for mounting a lens backwards. One side of the adapter screws into the lens’ filter thread and the other mounts onto a camera body or an extension tube. Using such an adaptor is advised when shooting at magnifications higher than 1:1. Two reverse adaptors are available: for 49 mm and 52 mm filter threads.

Reverse Ring Light Holder K

The reverse ring light holder K manual-aperture operation facilitates attaching a ring light to the mount of a lens that itself is mounted backwards on the body.

Stands and Tables

  • The macrophoto stand is very convenient for macrophoto photography. In the picture it is shown with a macro focus rail III and a bellows attached. The stand includes a reversible gray/black plate (the grey side has 18% reflectivity).
  • The lighting table is designed as an accessory to the macrophoto stand and is ideal for shooting transparent and semi-transparent objects.
  • The copypod is a compact, portable copy-stand which attaches to the filter thread of a lens or a closeup lens. It is available in two sizes (49 mm and 52 mm), and comes with a soft case.
  • The copy stand III is used for copying work. It is equipped with a fine adjustment device and an 18%-gray reflector.
  • The copy stand III p is portable, the carrying case serving as a base when the unit is assembled.
  • The table clamp is useful for fixing the copy stand III to a table-top less than 6 cm thick.