LensFever

Table Of Contents ✓ Preface In 1983, British lens designer Harold Dennis Taylor (1862–1943) (hereafter “Taylor”) designed a 3-element lens consisting of two convex lenses and a concave lens (Cooke Triplet)[1], opening a new page in modern design of photographic lenses. Cooke Triplet Patent US568052 (includes variation) Features of the Cooke Triplet lens The triplet designed by Taylor are arranged in order of postive – negative – postitive. The focal power of the negative lens must be more or less equals to the focal power of the two postive lenses. The triplet has enough degrees of freedom for the lens designer to correct monochromatic aberrations(spherical, coma, astigmatism, field curvature) and chromatic aberrations(axial and lateral). Alternatively, apart from the simplest three-element design, the lens designer can replace any of the element with a glue doublet or splitting any of the element into multiple elements. Brit. Pat. 22,607 When Taylor published his des

  The second-generation Leica M to Nikon Z AF lens adapter TZM-02 from Techart will be officially released soon. I am fortunate enough to borrow this engineering sample for testing, let’s see how the autofocus performs. Table Of Contents ✓ Specification: Weight: ~150g Diameter: ～68mm *Compatible with all the latest Nikon Full Frame & APS-C camera models (Z9, Z7II, Z7, Z6II, Z6,Z5, Z50, Zfc, Z30, etc) *not applicable to LTM/M mount lenses with a infinity lock button near the lens mount In-Body Image Stabilization (IBIS) Settings By adjusting the aperture value, we can change the focal length value transmitted to the camera to obtain better image stabilization. The relationship between the aperture value and the focal length value transmitted is shown on the following table: Aperture Value(F) 1.0 1.1 1.2 1.4 1.6 1.8 2.0 2.0 Lens Focal Length(mm) 135 90 85 75 55 50 40 30 Aperture Value(F) 2.5 2.8 3.2 3.5 4.0 4.5 5.0 5.6 Lens Focal Length(mm) 28 25 24 21 20 18 16 12 L

Rodenstock was a well-known manufacturer of medium/large format lenses as well as enlarging lenses. From 1950s to early 1960s, they had produced some interchangeable Lenses for 35mm SLR and viewfinder cameras. Like many other Germany manufacturer, the lenses changed from chrome finish to black finish with focus/aperture ring in zebra style. Although Rodenstock produced two million lenses from 1954 to 1961, it seems the production number of interchangeable lenses is relatively low compare to other Germany manufacturer.  I have included some data on serial numbers in the list below. As I don’t have the official production figures, the data may be far from complete. [u][b]If you have seen or owned a lens with serial number not listed in below, it will be nice if you let us know the serial number (first five digits or the whole number) with a link or photo. If you found any errors, please let me know too. Below is the list of all the interchangeable lenses made for 35mm cameras, sorted b