Minolta MC Macro Rokkor-QF 50mm f/3.5

Seventy-two by forty-eight millimetres. That is the patch of the world this lens puts on a 35mm frame when the focusing ring reaches its stop at 0.23 m. It is a bit smaller than a credit card, and the lens gets there at 1:2 with no tube or bellows involved. Minolta gave up aperture to do it. At f/3.5 it sits roughly two stops behind the 55mm f/1.7 most SR-T owners already had, and in a dim room the finder makes the gap obvious.

There was a Macro Rokkor-QF as early as December 1961, but that was an M39 screw lens that needed an adapter to reach SR bodies. Minolta's lens data dates this MC version to September 1967. It fits the SR bayonet directly and carries the meter-coupling tab, so an SR-T 101 meters through it at full aperture. The suffix is Minolta's construction code: Q for four groups, F for six elements, which matches the data sheet. Next to the 55 and 58 mm standard lenses it frames slightly wider, as the shorter focal length implies. The barrel is long for a fifty, a lot of lens for one this slow.

For life size you need the 25 mm macro ring, which Minolta sold as the life-size adapter. Fitted between lens and body it covers 0.5x to 1.0x. That span explains the lens's second career copying negatives on digital cameras, because a 35mm frame only fills a full-frame sensor at 1:1. Going past life size takes more extension still, such as a bellows. Look into the front and the glass seems to be hiding. It sits so deep in the barrel that the data sheet lists the hood as integral, so there is nothing separate to lose.

Judging it at infinity misses the point; nobody buys a half life-size macro to shoot street scenes at f/3.5. At 1:2, depth of field shrinks to a few millimetres, so on a copy stand or over a flower you end up at f/8 to f/16 anyway. There the slow maximum aperture costs you a bright finder more than it costs you pictures. The real limitation is the focusing. To reach 1:2 the helicoid has to move the optics about 25 mm forward of the infinity position, and that takes a lot of rotation. Nudging a stamp into focus goes precisely. Following a bee does not.

Light loss is the other thing the ring changes. Minolta's sheet gives the effective aperture with it fitted as f/5.6 to f/32, and even at 1:2 without it the image on film is dimmer than the f-number on the barrel suggests. An SR-T metering through the lens sees that dimmer image by itself; a handheld meter has no way of knowing. Zone Light Meter's Bellows Extension tool takes the draw (50 mm at infinity, 75 mm with the ring fitted at infinity, more as you focus closer) and gives the stops to add, so a handheld reading over a copy stand comes out right.

In February 2022 Vintage Camera Digest found copies badged Macro Rokkor-X, the name officially imported US lenses carried, at US$50 to $70 on eBay. The serious alternatives come from Minolta itself. The 1977 MD Macro Rokkor and the 1981 MD Macro keep the f/3.5 to f/22 range and the 55 mm thread, and add the MD tab that shutter-priority bodies read. On an SR-T, which has no shutter priority to feed, that tab buys nothing, and the MC lens is often the cheaper way in. Before you pay, ask whether the ring is in the box. Without it you have a half life-size fifty and a separate hunt ahead of you.