svenning Posted September 18, 2006 Share #1 Posted September 18, 2006 Advertisement (gone after registration) Digital cameras with a crop factor changes the focal lenght of the lens - a 180 mm lens will become a 288mm lens with a 1.6 crop factor ............ that must be a fact (?) What will a safe handhold shutter speed be for such a lens (?) A 1/180 sec or a 1/288 sec (?) I am confused - can anybody clarify (?) All the best - Svenning, Denmark. Link to post Share on other sites More sharing options...
Advertisement Posted September 18, 2006 Posted September 18, 2006 Hi svenning, Take a look here Safe handhold shutter speed?. I'm sure you'll find what you were looking for!
albertwang Posted September 18, 2006 Share #2 Posted September 18, 2006 The shutter speed is based on the actual focal length of the lens that you are holding... the crop factor doesn't matter. For example, my E300 has a 2X crop factor, so a 50mm Summicron can work handheld down to 1/50 (although I can get 1/15 sometimes) in most cases. It would not be 1/100 there. Hope this helps... remember that the crop factor doesn't change the properties of a lens. A 16mm lens on a 2X body will still leave a 16mm depth of field not 32mm depth of field. Only the viewing angle will change. Link to post Share on other sites More sharing options...
marknorton Posted September 18, 2006 Share #3 Posted September 18, 2006 Albert, I think you are wrong. It comes down to the level of enlargement required to produce a print of a fixed size. The more you increase the crop factor, the more you have to enlarge what's left and the more evident camera shake effects will be and therefore the faster the shutter speed you need. So my vote in Svenning's example is for 1/288... Andy will probably set us straight though... Link to post Share on other sites More sharing options...
TimF Posted September 18, 2006 Share #4 Posted September 18, 2006 Yes, I agree with Mark on this one. That said, the one-over-the-focal-length rule is a very loose one. Its generally too slack for longer lenses, where you should be aiming for a shutter speed at least twice as fast (eg, for a 300mm lens, use a shutter speed of at least 1/640th), and for rangefinder users at least, too rigid for wide-angles. Link to post Share on other sites More sharing options...
marknorton Posted September 18, 2006 Share #5 Posted September 18, 2006 I find the acceptable shutter speed is more related to how much wine I have had the previous evening than the lens on the front of the camera... Link to post Share on other sites More sharing options...
albertwang Posted September 18, 2006 Share #6 Posted September 18, 2006 Ah, perhaps I am wrong here then... Yes, the crop factor is basically an internal enlargement. So it would be that handshake would be magged in the final print. Okay, I'm feeling bad that using Mega OIS and IS and VR and other tech devices have made this rule not so useful anymore. I find myself having no qualms about holding 1/4 and 1/8 shutter speeds! Link to post Share on other sites More sharing options...
lct Posted September 18, 2006 Share #7 Posted September 18, 2006 Advertisement (gone after registration) ...a 180 mm lens will become a 288mm lens with a 1.6 crop factor... What will a safe handhold shutter speed be for such a lens (?)...A 1/180 sec or a 1/288 sec (?)... Preferably 1/288 in practice. Link to post Share on other sites More sharing options...
stunsworth Posted September 19, 2006 Share #8 Posted September 19, 2006 Preferably 1/288 in practice. I agree, the 'rule' tends to break down with longer lenses in my experience - possibly due to their weight and length. Link to post Share on other sites More sharing options...
albertwang Posted September 19, 2006 Share #9 Posted September 19, 2006 Yes, tripod the longer lenses or at least use IS/VR or image stabilizers to help you out. Link to post Share on other sites More sharing options...
john_r_smith Posted September 19, 2006 Share #10 Posted September 19, 2006 There are no hard and fast rules here. Particularly with a rangefinder camera (no mirror slap) you should be able to handhold to quite slow speeds, provided that you can brace yourself against a tree or wall or suchlike. The other trick is to put your elbows on top of a wall and brace yourself that way. I have managed down to 1/15s with a 50mm standard lens on an SLR (inside a church), braced against a column. Kate my wife, who does not drink or smoke, can pull it off at 1/8s and get an acceptably sharp print. Always frame up, brace but do not tense up, breath out and shoot in the pause before you breath back in. A bit like competition rifle shooting, really. John Link to post Share on other sites More sharing options...
jrgeoffrion Posted September 19, 2006 Share #11 Posted September 19, 2006 Digital cameras with a crop factor changes the focal lenght of the lens - a 180 mm lens will become a 288mm lens with a 1.6 crop factor The crop factor does NOT change the focal length. The FL is a function of the optical design. All a crop factor does is take a portion of the 24mmx36mm image circle. As for the answer to the question, it's mostly a function of the camera, lens, and user. You'll get more 1-2 stops more mileage out of a rangefinder. Link to post Share on other sites More sharing options...
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