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Message: <blockquote data-quote="typo" data-source="post: 3142972" data-attributes="member: 83808">Kimmo,That sounds straight forward enough but I might skip the coffee. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /> I would suggest that we probably need to consider light levels as well. I normally try to do my testing with outdoor light levels around 3-4000lux  or chart levels about 300cd/m2 which is where my eyesight is at it's best. Even a cloud going over can drop my acuity by 10 to 20 arcseconds and indoor testing is really a non starter for me and would totally mask any differences due to shake (I know, I tried earlier). If you don't have a meter then direct sunlight an hour or so either side of midday should be somewhere close this time of year. With the weather forecast as it is I might have to wait a day or two for sunshine though.David</blockquote>