It is a myth...

that vibration from mirror slap can cause a loss in image quality.

I have tested by placing a 5 cent(euro zone) coin on top of the lens close to its mount, with all shutter speed expecting the coin to fall but it didn't.

This brought me to the conclusion that the vibration from mirror slap is almost negligible.

... or, at least, not worth a plug nickel!

It is there but your test was not good enough to capture it. Check out this post. It clearly shows the effect the mirror has on an image.

https://photography-on-the.net …php?p=9471184&p​ostcount=8

I placed a penney on my 100-400 while shooting a 10 sec handheld exposure and it didn't fall off. Dispelling the myth that you need a tripod for long exposures.

What kind of surface did you have the lens resting on?

There is physical movement, which will be translated differently into vibration depending on how the camera is supported.

While the actual amount of vibration caused may be minimal, it does still pose a chance to impact image quality.

My car is red and didn't overheat so therefore red cars do not overheat.... Test the actual circumstances, not some silly analog that doesn't correspond.

It is there... but I don't worry about it most of the time, myself. Maybe if I'm shooting the "perfect" scene, and I have plenty of time for setup, I might think about it. Otherwise, I hardly ever think about it. Sometimes I'll use LV other times, I don't.

So far, it's never impacted my work... although who knows, maybe it did and I don't realize it.

raavi wrote in post #13076339
I have tested by placing a 5 cent(euro zone) coin on top of the lens close to its mount, with all shutter speed expecting the coin to fall but it didn't.

I can hop one-legged aross the room with a penny on my nose... it doesn't fall... who the hell needs IS?

Nathan wrote in post #13076468
I can hop one-legged aross the room with a penny on my nose... it doesn't fall... who the hell needs IS?

youtube or it didn't happen!

raavi wrote in post #13076462
Is the first image, 100% crop.

Yes, I believe so. The effect is not large, but it is real and does have some effect to IQ..

Check this out: http://www.petapixel.c​om/?s=mirror+laser

It depends on what kind of image you want and what focal length you are using to decide if mirror slap will affect your I.Q. a lot or a little. Check out this test done by Markins to at least show you there is a difference. Particularly page 10.

http://markins.com/cha​rlie/report4e6.pdf

raavi wrote in post #13076339
that vibration from mirror slap can cause a loss in image quality.

I have tested by placing a 5 cent(euro zone) coin on top of the lens close to its mount, with all shutter speed expecting the coin to fall but it didn't.

This brought me to the conclusion that the vibration from mirror slap is almost negligible.

Not sure what you are hoping to prove with this.....the only way to determine if there is an effect on IQ is to take two photos, one with MLU and one without and compare the results side by side. If you want to get real technical, try the series of images using different tripods and support media....you might be surprised by the result.

Woolburr wrote in post #13076849
Not sure what you are hoping to prove with this.....the only way to determine if there is an effect on IQ is to take two photos, one with MLU and one without and compare the results side by side. If you want to get real technical, try the series of images using different tripods and support media....you might be surprised by the result.

Also at different shutter speeds. One school of thought is that mirror lockup doesnt affect shots over a certain length because the vibration is dampened fairly quickly so the amount of image recorded during the vibration is insignificant.

Yeah what you (raavi) don't seem to realize is that tiny vibrations that are undetectable by you or the coin can seriously impact an image. No only can it make an image appear blurry but it can impact contrast as well.

Do another test with you camera on a flat table. Place the coin like you did before and do a couple second exposure. Now do the another shot but gently hit your hand on the table for the duration of the shot. Not too hard though that the coin falls off, you'll find it takes quite a bit of vibration to overcome the friction the coin has on the lens. What you will notice though is how much blurrier your 2nd image is.