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Asahi Auto-Takumar 1:1.8/55

Description and Review

Description, Notes & Specifications

Manufactured:	1960—1962
Camera Mount:	M42x1
Lens Elements / Groups:	6 / 5
Diaphragm Type:	automatic / manual
Diaphragm Blades:	6 / hexagonal
Angle of View:	43°
Maximum Aperture:	f/1·8
Minimum Aperture:	f/16
Minimum Focus Distance:	0·45 metres
Magnification Factor:	—
Filter Size:	ø 49 mm (screw)
Length:	35·5 mm / 0·45 mm
Largest Diameter:	55 mm
Weight:	≈215 grams
Product Number:	345
Serial Number Range:	—
My Serial Number:	433610

The mechanical design is actually that of a Super-Takumar.

Distance engravings in yellow (metres) and blue (feet); no IR marker.

The diaphragm ring moves counter-clockwise and the A/M lever is reversed.

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Depth of Field Guide

	f/1·8		f/2		f/2·5		f/2·8		f/3·5		f/4		f/4·5		f/5·6		f/6·7		f/8		f/9·5		f/11		f/13		f/16
0·45	0·45	0·45	0·45	0·45	0·45	0·45	0·44	0·46	0·44	0·46	0·44	0·46	0·44	0·46	0·44	0·46	0·44	0·46	0·44	0·47	0·43	0·47	0·43	0·47	0·43	0·48	0·42	0·48
0·50	0·50	0·50	0·50	0·50	0·49	0·51	0·49	0·51	0·49	0·51	0·49	0·51	0·49	0·51	0·49	0·51	0·48	0·52	0·48	0·52	0·48	0·52	0·48	0·53	0·47	0·53	0·46	0·54
0·55	0·54	0·56	0·54	0·56	0·54	0·56	0·54	0·56	0·54	0·56	0·54	0·56	0·54	0·56	0·53	0·57	0·53	0·57	0·53	0·57	0·52	0·58	0·52	0·58	0·51	0·59	0·51	0·60
0·60	0·59	0·61	0·59	0·61	0·59	0·61	0·59	0·61	0·59	0·61	0·59	0·61	0·58	0·62	0·58	0·62	0·58	0·62	0·57	0·63	0·57	0·63	0·56	0·64	0·56	0·65	0·55	0·66
0·70	0·69	0·71	0·69	0·71	0·69	0·71	0·69	0·71	0·68	0·72	0·68	0·72	0·68	0·72	0·67	0·73	0·67	0·73	0·66	0·74	0·66	0·75	0·65	0·76	0·64	0·77	0·63	0·79
0·80	0·79	0·81	0·79	0·81	0·78	0·82	0·78	0·82	0·78	0·82	0·78	0·83	0·77	0·83	0·77	0·84	0·76	0·84	0·75	0·85	0·74	0·86	0·74	0·88	0·73	0·89	0·71	0·92
0·90	0·89	0·91	0·88	0·92	0·88	0·92	0·88	0·92	0·87	0·93	0·87	0·93	0·87	0·94	0·86	0·95	0·85	0·96	0·84	0·97	0·83	0·98	0·82	1·00	0·81	1·02	0·79	1·05
1·00	0·98	1·02	0·98	1·02	0·98	1·03	0·97	1·03	0·97	1·04	0·96	1·04	0·96	1·05	0·95	1·06	0·94	1·07	0·93	1·09	0·91	1·10	0·90	1·12	0·88	1·15	0·86	1·19
1·20	1·17	1·23	1·17	1·23	1·16	1·24	1·16	1·24	1·15	1·25	1·14	1·26	1·14	1·27	1·12	1·29	1·11	1·31	1·09	1·33	1·08	1·36	1·06	1·38	1·04	1·42	1·01	1·49
1·50	1·46	1·54	1·46	1·55	1·44	1·56	1·44	1·57	1·42	1·58	1·41	1·60	1·40	1·61	1·38	1·64	1·36	1·67	1·34	1·71	1·31	1·75	1·28	1·80	1·25	1·87	1·21	1·99
2·00	1·93	2·08	1·92	2·09	1·90	2·11	1·89	2·12	1·87	2·16	1·85	2·18	1·83	2·20	1·79	2·26	1·76	2·32	1·72	2·39	1·67	2·49	1·63	2·59	1·58	2·73	1·50	2·98
3·00	2·84	3·18	2·82	3·20	2·78	3·25	2·76	3·29	2·71	3·37	2·67	3·43	2·63	3·49	2·55	3·63	2·48	3·79	2·40	4·00	2·31	4·26	2·23	4·56	2·14	5·04	2·00	5·98
5·00	4·57	5·52	4·53	5·58	4·42	5·75	4·36	5·86	4·23	6·12	4·13	6·32	4·05	6·54	3·87	7·07	3·70	7·70	3·52	8·60	3·34	9·94	3·17	11·78	2·98	15·63	2·72	30·67
10·00	8·41	12·34	8·26	12·66	7·92	13·57	7·72	14·18	7·31	15·83	7·04	17·27	6·79	18·99	6·29	24·34	5·87	33·88	5·43	63·14	5·00	∞	4·64	∞	4·22	∞	3·73	∞
∞	35·56	∞	33·07	∞	28·15	∞	25·84	∞	21·69	∞	19·46	∞	17·65	∞	14·64	∞	12·51	∞	10·68	∞	9·13	∞	7·97	∞	6·82	∞	5·61	∞

(Distances in metres; Circle of Confusion is taken at 0·032 millimetres.)

Review

Recommended: Not Tested

References

1. van Oosten, G. 1999. The Ultimate Asahi Pentax Screw Mount Guide. Uitgeverij Jansz.

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23 July 2011