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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:

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.

Table 1. Specifications of the Pentax close-up lenses.
Close-Up Lens Diameter (mm) Use With Lenses with f (mm) If Used With Subject Distance (cm) Magnification
S25 49, 52 50 50/1.7 32.6 ~ 22 1/4.8 ~ 1/2.7
S40 49, 52 50 50/1.7 48 ~ 27 1/7.6 ~ 1/3.5
T80 49, 52 85 ~ 150 85/2 91.6 ~ 50.5 1/9.4 ~ 1/4.2
T95 52, 58 135 ~ 200 200/4 111.7 ~ 80.3 1/4.96 ~ 1/2.61
T160 49, 52 100 ~ 150 135/3.5 174.2 ~ 79.1 1/12.3 ~ 1/4.31
T183 52, 58 135 ~ 200 200/4 200 ~ 108 1/9.5 ~ 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:

Table 2. Specifications of the Pentax extension tubes.
Tube Name Length
Auto Extension Tube K 50 mm
Auto Extension Tube K 100 mm
Helicoid Extension Tube K manual diaphragm operation 26 ~ 46 mm
Manual Extension Tube Set K manual diaphragm operation 9.5, 19, 28.5 mm
Auto Extension Tube Set K 12, 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.

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.

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