Tech Guide

Focal Length Comparison Guide
35mm	6 x 4.5cm	6 x 6cm	6 x 7cm	6 x 8cm	6 x 9cm	4.5" x 5"
20mm		30mm	37mm	40mm	50mm	65mm
24mm		40mm	45mm	50mm	55mm	75mm
28mm	40mm	50mm	50mm	65mm	65mm	90mm
35mm	50mm	60mm	65mm	80mm	75mm	115mm
50mm	75mm	80mm	90mm	100mm	105mm	150mm
60mm	100mm	100mm	110mm	120mm	135mm	180mm
85mm		120mm	160mm	180mm	190mm	240mm
105mm	150mm	150mm	180mm	210mm	250mm	300mm
135mm	200mm	180mm	250mm	250mm		360mm
150mm	225mm	250mm				320mm
180mm					360mm	480mm
200mm		320mm	360mm			600mm
300mm	450mm	480mm	480mm

Table of Large Format Lenses
Lens	Field Angle @ 122	Image Circle in mm @ 122	Smallest Aperture	Mount Size Copal Shutter	Maximum Film Size
Rodenstock 14.5 APO Grandagon55mm	110°	163	45	0	4x5
Rodenstock 14.5 Grandagon65mm	105°	170	45	0	4x5
75mm	105°	195	45	0	4x5
Rodenstock 16.8 Grandagon75mm	102°	187	45	1	4x5
155mm	102°	382	45	1	8x10
Rodenstock 14.5 Grandagon - N 90mm	105°	236	45	1	5x7
Caltar 16.890mm	102°	187	45	0	4x5
Rodenstock 16.8 Grandagon - N115mm	104°	291	45	1	5x7
Nikon AM-ED 15.6 120mm	55°	250	45	0	5x7
Caltar 15.6 135mm	72°	200	45	3	4x5
150mm	72°	214	64	3	4x5
210mm 15.6 Sinaron-S 210mm	72°	301	64	1	5x7
Rodenstock 15.6 APO Sironar-W210mm	80°	352	64	3	8x10
Rodenstock 15.6 APO Sironar-N180mm	72°	262	64	1	5x7
210mm	72°	301	64	1	7x7
240mm	72°	350	64	3	5x7
360mm	72°	435	64	3	8x10
Rodenstoock 15.6 APO Sironar-S240mm	75°	316	64	3	5x7
300mm	75°	448	64	3	8x10
Rodenstock 15.6 Macro 210mm	64	1:3 350	45	3	8x10
		1:1 525
300mm	50	1:3 360	64	3	8x10
		1:1 550
Rodenstock 19.0 APO Ronar 480mm	46°	396	90	3	8x10
Rodenstock 18.4 APO Sironar-N480mm	56°	500	90	3	8x10

Speedotron Flash Duration (in seconds for each power setting in w/s)
Model	9600	4800	2400	1200	600	300
102	—	—	1/225	1/500	1/670	1/1250
202	—	—	1/300	1/500	1/670	1/1425
206	—	1/175	1/300	1/500	1/900	1/1425
105	1/400	1/600	1/1175	1/2000	1/3750	1/5000
104	—	1/240	1/500	1/670	—	—

Profoto Flash Duration (in seconds for each power setting in w/s)
Model	4800	2400	1200	600	300	150
Pro5a	1/650	1/650	1/1000	1/1700	—	—
Pro6	—	1/1000	1/1600	1/2200	1/3200	1/5300
Pro-7a	—	1/60	1/2200	1/3200	1/5300	1/8000
Pro-7b	—	—	1/1400	1/2000	1/3000	1/3000
PA 2400	—	1/60	1/300	1/500	—	—
Acute2	—	1/320	—	—	—	1/1800

Dyna-Lite Flash Duration (in seconds for each power setting in w/s)
Model	Full power single head	Minimum power two heads
M1000XR	1/600	1/2500
M2000XL	1/700	1/2500