quixotic Posted May 12, 2018 Share #1 Posted May 12, 2018 Advertisement (gone after registration) I did a test the other day with a roll of film. Every odd numbered shot with no MLU, and every even numbered shot with MLU (same image for the two shots, therefore 18 different images on a roll of 36). It was all on a tripod, so I could compare sharpness. I didn't find any differences, though the longest shutter exposure was 1/6". Has anybody done any conclusive tests on this unit, particularly with longer shutter exposures? Quote Link to post Share on other sites More sharing options...
Advertisement Posted May 12, 2018 Posted May 12, 2018 Hi quixotic, Take a look here MLU necessary on the R8?. I'm sure you'll find what you were looking for!
sarkleshark Posted May 12, 2018 Share #2 Posted May 12, 2018 What ia MLU? 2 Quote Link to post Share on other sites More sharing options...
erl Posted May 12, 2018 Share #3 Posted May 12, 2018 +1 Quote Link to post Share on other sites More sharing options...
andybarton Posted May 12, 2018 Share #4 Posted May 12, 2018 Mirror Lock Up? 1 Quote Link to post Share on other sites More sharing options...
masjah Posted May 12, 2018 Share #5 Posted May 12, 2018 What focal length lens were you using? Quote Link to post Share on other sites More sharing options...
masjah Posted May 12, 2018 Share #6 Posted May 12, 2018 PS: Did you also use a cable release or the camera's own self-timer? Quote Link to post Share on other sites More sharing options...
Michael Geschlecht Posted May 12, 2018 Share #7 Posted May 12, 2018 (edited) Advertisement (gone after registration) Hello Everybody, And, on a really solid tripod with a solid tripod head, after cocking the shutter & making all adjustments including focusing & stopping down the lens, was there at least 1 minute of waiting for everything to "settle down" before the shutter was GENTLY released? Longer than 1 minute if using a long lens or photographing something close up. Or both.Best Regards, Michael Edited May 12, 2018 by Michael Geschlecht Quote Link to post Share on other sites More sharing options...
quixotic Posted May 13, 2018 Author Share #8 Posted May 13, 2018 Hello Everybody, And, on a really solid tripod with a solid tripod head, after cocking the shutter & making all adjustments including focusing & stopping down the lens, was there at least 1 minute of waiting for everything to "settle down" before the shutter was GENTLY released? Longer than 1 minute if using a long lens or photographing something close up. Or both. Best Regards, Michael Nope. 5 or 10 seconds maaaybe. In the past, with other cameras, if there was any breeze, I'd tension a bungee cord from the head down to the ground, but that's usually with medium format. With the R8, at the exposure times I was using, I didn't see any difference between MLU and non-MLU anyway. Quote Link to post Share on other sites More sharing options...
quixotic Posted May 13, 2018 Author Share #9 Posted May 13, 2018 PS: Did you also use a cable release or the camera's own self-timer? It was with a cable release, and the lens I had was a 35mm Curtagon. I did a bit more hunting around the internet after I posted, and someone mentioned that he/she never bothered with lock-up on the R8. There was some speculation that it might have just been a selling feature, as opposed to a fix for an actual problem. Quote Link to post Share on other sites More sharing options...
masjah Posted May 13, 2018 Share #10 Posted May 13, 2018 Vibrations (whether caused by pressing the shutter or by mirror vibrations) are much more troublesome with long focal length lenses. For tripod work I tend to use lock-up in conjunction with the self timer (or with a cable release if the very instant of shutter press is critical). I once took a picture of the central ceiling boss of York Minster, for which a sturdy tripod with legs unextended, mirror lock-up and the self timer were all essential. That used the 280/4 Apo R + 2X Apo Extender. I suspect that it is in extreme cases such as this that mirror lock-up is most useful. Paradoxically, some say that with very long exposures, say 10 seconds plus, lock-up starts getting less important again, because the fraction of the exposure that is subject to vibration is much less. Personally I play safe, and for tripod work, I tend to use lock-up and self-timer (or cable release) as a matter of course. 1 Quote Link to post Share on other sites More sharing options...
erl Posted May 13, 2018 Share #11 Posted May 13, 2018 As an aside, Hasselblad in their later models employed a system where the mirror as it swings up, also 'glides' back into a park position, rather than just thumping up. Maybe I didn't explain that very well, but my point is that is well accepted that mirror flop IS detrimental to image sharpness. Anything that can avoid it is good. Leica M has it well solved! 1 Quote Link to post Share on other sites More sharing options...
Michael Geschlecht Posted May 13, 2018 Share #12 Posted May 13, 2018 (edited) Hello Quixotic, Welcome to the Forum. A non-stretchable cord might give somewhat more stability when you use a cord to to add stability to a camera & lens on a tripod. Also: Shorter focal length lenses need less stability than longer lenses. Even with that I can see the difference in sharpness in photographs between a properly stabilized Camera & lens on a tripod and a more casually stabilized camera & lens on a tripod when using a 35mm lens on an M3. Best Regards, Michael Edited May 13, 2018 by Michael Geschlecht Quote Link to post Share on other sites More sharing options...
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