Topcor RE Auto-Topcor 58mm f/1.4

Tokyo Kogaku built this to sit on the front of the Topcon RE Super, the 1963 SLR that beat every Japanese and German maker to through-the-lens metering with a cell behind the mirror. The body was the headline, but a flagship body needs a flagship normal, and the 58mm f/1.4 was it. A slightly long standard like 58mm was a common convention for fast normals of the period, with several rivals landing in the 55 to 58mm range, and the extra few millimeters tend to ease corner correction at the apertures these designs have to open to.

The optical formula is a seven element, five group modified Planar, a double-Gauss derivative and the layout almost every fast fifty of the era leaned on. Topcor's execution is one of the better ones nobody talks about. Wide open at f/1.4 it is soft the way fast double-Gauss glass is soft, with a faint glow on specular highlights and contrast that thins out toward the corners. Stop down to f/2.8 and it snaps into real sharpness across most of the frame. By f/5.6 it is genuinely crisp corner to corner. Color reads neutral and slightly cool, with contrast a touch higher than the contemporary Auto-Nikkor, which is part of why the rendering looks clean rather than vintage-hazy.

Bokeh is where it earns its keep, and it is more characterful than most reviews let on. Wide open the background takes on a mild swirl, the lens sitting somewhere between a smooth Planar and the harder Biotar or Xenon school, swirling but never as aggressively as those. By f/2 the rotation calms and the blur goes to a soft, rounded field without the busy double-line edges that plague some Gauss designs. People who shoot it tend to keep it as a low-light normal that draws skin and hair pleasantly without fighting the scene.

The honest weakness is flare. This is 1960s coating on a fast lens, so pointing it at the sun or a bright source just outside the frame throws veiling haze and the occasional aperture-shaped ghost, and contrast collapses in backlight. Shoot it with a hood. Field curvature is mild but present wide open, so flat-subject work at f/1.4 will show soft corners no matter how carefully you nail focus.

The mount situation is worth understanding before you buy in. The RE system uses the Exakta inner bayonet, so older manual and preset Exakta lenses will physically mount on a Topcon RE body. What Topcon added was an internal full-aperture metering coupling, which means its own RE Auto-Topcor lenses are effectively tied to Topcon bodies to work as intended. When Topcon left the camera business the system was orphaned anyway, and that kept prices low for decades. The 58mm f/1.4 cross-shops against a Super-Takumar 50mm f/1.4 or an early Auto-Nikkor 58mm, holds its own optically, and usually costs less, with the catch that adapting it to mirrorless is fiddly given the rare bayonet.

At f/1.4 in a dim room this lens pulls a lot of light, and you will be working at the bottom of your shutter range where reciprocity and small handheld errors start to matter. Meter for the shadows you actually want to hold, set your film and the exact f/1.4 reading in Zone Light Meter, and let it place the rest of the scale so you are not guessing the highlights when the frame is mostly dark.