I have a question about photography. I am in urgent need of help from someone knowledgeable.

120:

1. Seagull 4 series twin-lens reflex cameras, now common models include 4A and 4B;

This is an early twin-lens reflex camera produced by Shanghai Camera Factory. Among them, the high-end model in 4A uses Tiansai lens. The structure is 4 elements in 3 groups. Compared with the 3 elements in 3 groups of the ordinary 4 series, the advantage is that it is slightly sharper and the edge quality is improved a bit.

2. Rolleiflex twin lens reflex camera.

Produced in the mid-1950s, 1960s and 1970s. Among them: E, F, T and other models have reached a high level in terms of mechanical structure, production technology, manufacturing technology, product matching and performance, and were once best-selling in the international market. Generally speaking, the characteristics of Rolleiflex are two lenses, upper lens for viewing, lower lens for photography, rocker to wind the film, micro-sensor roller type automatic film stop, which is linked to the winding and can be exposed multiple times, and can also prevent re-shooting. It adopts the Cambon inter-lens shutter with excellent structure, performance and materials and has M, Transmission gears and parts with motion friction, coupling and other parts are mostly made of high-quality brass or alloy steel. The main spring of the shutter is made of high-quality cobalt-based stainless steel, so as long as it is used and stored properly, it has a long service life.

135:

1. Nikon F70;

Multiple change program system, program auto (auto multi-program) with flexible program function, shutter-priority auto, aperture-priority auto and manual exposure; shutter speed is 1/4000 to 30 seconds; in When P or A is set, it is a stepless shutter; when S or M is set, it is positioned at 1/3EV; there is also a B door; the metering specification is 3D matrix, focusing on the center and key points; it is EV-1-20, matched with ISO100 Calculation for f/1.4 lens (key metering is based on EV4-20).

2. Nikon fm2;

FM2 includes depth of field prediction, multiple exposures, flash sync cable jack, 1/250 second flash sync speed, and 1/4000 second shutter speed. The body is small and compact and easy to carry. One of the most popular features among professional photographers is that the FM2 shutter uses no electricity at all.

3. Canon AE-1;

CANON AE1 is the first machine to introduce microcomputer-controlled AE technology into a camera. AE1 also has an epoch-making feature, that is, it is basically produced on an automated assembly line, with extremely high production efficiency.

4. Konica Autoflex TC;

The image is sharp and clear, and the depth of field is outstanding.

5. Minolta X700;

The famous Japanese female photographer Mika Ninagawa’s first camera was this Minolta X700. All the contacts in the fuselage are gold-plated, and the bayonet is made of oily metal. Even with frequent use, there will be no wear. The viewfinder is bright, the exposure is accurate, TTL exposure function, P, A, S multi-function automatic exposure.

6. Nikon FG;

There are A door and mechanical M90, B door, the shutter vibration is large, and there is no repeated exposure function.

7. Ricoh Door B has a time prompt, which is more convenient for accurate exposure. Some more practical functions such as exposure lock, exposure bracketing, continuous shooting, etc. are available. Although the body is made of plastic, it has a lot of weight. The only drawback is that the reflector and film winding make a lot of noise when pressing the shutter button. The LED backlight in the viewfinder cannot be turned on manually, and the parameters cannot be clearly seen when it is not bright or dark.

8. Olympus OM2-n.

The camera's light metering is accurate, with spot metering, bright viewfinder, and good sealing. But the disadvantage is that the film winding handle is a little tight, consumes more power, and is not easy to use for multiple exposures.

It took me half an hour to answer this, I’m so tired. Hope this helps.