Today I had some time to start my part of the hand-held vs tripod-mounted vs Image-stabilized resolution testing. For the sake of clarity, I decided to start a new thread rather than post this into the existing 8x25 IS thread. David, maybe you could summarize your tests from that thread and post the summary here.
My test setup was indoors, with a credit-card size Edmunds ES magnifier quality resolution chart that was on a window-sill lit by indirect outdoor light from one side and a halogen desk lamp from the other. This gives a glare-free illumination that I have not measured, but that typically yields visual resolution levels at or at least very close to my visual acuity maximum. Today’s resolution readings were such that I doubt there would have been much room for improvement with even better light, but I will later duplicate these tests using a back-lit glass slide target and then we’ll know.
Testing distance was 11.1 meters, which was measured after the tests and before the calculations. Binoculars were a Nikon 10x42 SE, #002394, so a very early unit, but one that I have used as a test reference for 15 years now and that has very good optics. The other binocular was a Canon 10x42 IS L, #72600xxx, that I acquired last fall.
I started by placing another target where the test target would be, and focusing as well as setting the diopter exactly right for both binoculars (on tripod) for the exact testing distance. After this, neither focus nor diopter was touched on either binocular, and with the Canon care was taken to keep it horizontal at all times, since hanging it vertically can cause focus creep.
For each resolution reading, I used a timer set to 1 minute of viewing time, and the order of testing was 1) hand-held, 2) hand-held with a finnstick, 3) hand-held with a finnstick that has horizontal handles at the bottom end, 4) hand-held with IS on (obviously only with the Canon) and 5) on tripod. I tested the Nikon first, then the Canon, and in the end re-checked the Nikon on the tripod to see if my eyes or the light level had changed enough to alter the results, which they had slightly but not enough to change the reading.
Nikon 10x42
Tripod mounted, pattern (group) 1, (element) 4 @ 11.1m which gives 6.6” (apparent VA 66”)
Hand-held, pattern 1,1 (not easily) @ 11.1m => 9.4” (app.VA 94”)
Hand-held with Finnstick: same as hand-held, but a bit easier.
Hand-held with Finstick that has handles – same pattern but considerably easier, almost next level. If simple hand-held was 1,1-, then Finnstick was 1,1 and Finnstick with handles was 1,1+
With the Nikon 10x42 SE, the loss of detail from tripod-mounted to hand-held tripod-mounted was 42%. This is not the whole story, though, since what can be resolved is very much more difficult to see, and takes quite some concentration to get. On a tripod, you pretty much immediately get the second-smallest reading, and the rest of the time is spent hunting for glimpses of the smallest readable one. However, having more time for the hand-held readings would not help (I tried this), since pretty quickly your arms tire and shaking increases. Using a Finnstick, even with handles, does not seem to help me see significantly smaller detail, although it does make viewing much more pleasant and almost fatigue-free. Others may have different results, though. For some reason, the 10x42 SE has always been a difficult binocular for me to get steady views with, and I would expect to do better with a roof that has equally good optics.
Canon 10x42 IS L
Tripod-mounted: pattern 1,4+ @ 11.1m which gives ca 6.3” (app.VA 63”)
Hand-held with stabilizer engaged: pattern 1,4- => ca 6.8” (appVA 68”)
Hand-held with Finnstick: pattern 1/1+ => ca 9.0” (appVA 90”)
Hand-held with Finnstick/w. handles: 1,2- => 8.6” (appVA 86”)
Hand-held: 1,1+ => 9,0” (apparent visual acuity 90”)
In this test, the loss of detail from tripod to hand-held was 43%, from tripod to image-stabilized hand-held 8%, and from IS to non-IS hand-held 32%.
These results are across the board a little better than the ones I got for the Nikon. It is possible that this is partly due to the shortish distance, which could compromise the wide-objective-spacing Nikon somewhat. However, the Canon is for me easier to hold steadily than the Nikon, and its eyepieces give me the optimum view much more easily.
Because the above measurements have an element of interpolation guesswork in them due to the tripod-mounted and hand-held stabilized readings being of the same pattern but with pluses and minuses assigned (by me), I decided to also check for limiting distance for detecting the next smaller pattern, group 1 element 5. Here, I would move the tripod incrementally closer and re-focus, until I could detect the pattern, and then measured the distance. I then repeated the procedure hand-holding with IS. The tripod limiting distance I got was 10.84 meters, which equals just a hair over 60”, and the IS limiting distance was 10.7 meters. This test did not follow the time limit protocoll, though, but the difference between these readings is under 2%.
I’ll be interested in seeing what the next tests show with the glass slide, and later when the weather cooperates, outdoors at longer distances.
Cheers,
Kimmo
My test setup was indoors, with a credit-card size Edmunds ES magnifier quality resolution chart that was on a window-sill lit by indirect outdoor light from one side and a halogen desk lamp from the other. This gives a glare-free illumination that I have not measured, but that typically yields visual resolution levels at or at least very close to my visual acuity maximum. Today’s resolution readings were such that I doubt there would have been much room for improvement with even better light, but I will later duplicate these tests using a back-lit glass slide target and then we’ll know.
Testing distance was 11.1 meters, which was measured after the tests and before the calculations. Binoculars were a Nikon 10x42 SE, #002394, so a very early unit, but one that I have used as a test reference for 15 years now and that has very good optics. The other binocular was a Canon 10x42 IS L, #72600xxx, that I acquired last fall.
I started by placing another target where the test target would be, and focusing as well as setting the diopter exactly right for both binoculars (on tripod) for the exact testing distance. After this, neither focus nor diopter was touched on either binocular, and with the Canon care was taken to keep it horizontal at all times, since hanging it vertically can cause focus creep.
For each resolution reading, I used a timer set to 1 minute of viewing time, and the order of testing was 1) hand-held, 2) hand-held with a finnstick, 3) hand-held with a finnstick that has horizontal handles at the bottom end, 4) hand-held with IS on (obviously only with the Canon) and 5) on tripod. I tested the Nikon first, then the Canon, and in the end re-checked the Nikon on the tripod to see if my eyes or the light level had changed enough to alter the results, which they had slightly but not enough to change the reading.
Nikon 10x42
Tripod mounted, pattern (group) 1, (element) 4 @ 11.1m which gives 6.6” (apparent VA 66”)
Hand-held, pattern 1,1 (not easily) @ 11.1m => 9.4” (app.VA 94”)
Hand-held with Finnstick: same as hand-held, but a bit easier.
Hand-held with Finstick that has handles – same pattern but considerably easier, almost next level. If simple hand-held was 1,1-, then Finnstick was 1,1 and Finnstick with handles was 1,1+
With the Nikon 10x42 SE, the loss of detail from tripod-mounted to hand-held tripod-mounted was 42%. This is not the whole story, though, since what can be resolved is very much more difficult to see, and takes quite some concentration to get. On a tripod, you pretty much immediately get the second-smallest reading, and the rest of the time is spent hunting for glimpses of the smallest readable one. However, having more time for the hand-held readings would not help (I tried this), since pretty quickly your arms tire and shaking increases. Using a Finnstick, even with handles, does not seem to help me see significantly smaller detail, although it does make viewing much more pleasant and almost fatigue-free. Others may have different results, though. For some reason, the 10x42 SE has always been a difficult binocular for me to get steady views with, and I would expect to do better with a roof that has equally good optics.
Canon 10x42 IS L
Tripod-mounted: pattern 1,4+ @ 11.1m which gives ca 6.3” (app.VA 63”)
Hand-held with stabilizer engaged: pattern 1,4- => ca 6.8” (appVA 68”)
Hand-held with Finnstick: pattern 1/1+ => ca 9.0” (appVA 90”)
Hand-held with Finnstick/w. handles: 1,2- => 8.6” (appVA 86”)
Hand-held: 1,1+ => 9,0” (apparent visual acuity 90”)
In this test, the loss of detail from tripod to hand-held was 43%, from tripod to image-stabilized hand-held 8%, and from IS to non-IS hand-held 32%.
These results are across the board a little better than the ones I got for the Nikon. It is possible that this is partly due to the shortish distance, which could compromise the wide-objective-spacing Nikon somewhat. However, the Canon is for me easier to hold steadily than the Nikon, and its eyepieces give me the optimum view much more easily.
Because the above measurements have an element of interpolation guesswork in them due to the tripod-mounted and hand-held stabilized readings being of the same pattern but with pluses and minuses assigned (by me), I decided to also check for limiting distance for detecting the next smaller pattern, group 1 element 5. Here, I would move the tripod incrementally closer and re-focus, until I could detect the pattern, and then measured the distance. I then repeated the procedure hand-holding with IS. The tripod limiting distance I got was 10.84 meters, which equals just a hair over 60”, and the IS limiting distance was 10.7 meters. This test did not follow the time limit protocoll, though, but the difference between these readings is under 2%.
I’ll be interested in seeing what the next tests show with the glass slide, and later when the weather cooperates, outdoors at longer distances.
Cheers,
Kimmo