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02-26-2017, 07:47 PM - 3 Likes   #1
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Building a "red dot scope" for extreme macro!

I always use a red dot scope with large adapted telephoto lenses on the Q. This makes it much easier to find the subject! I have been playing around lately with macro lenses on a bellows. Like large telephoto lenses, this gives a very small field of view. It becomes very difficult to find the subject. A "macro red dot scope" was needed. Didn't see one available, so built one from scratch.

Disclaimer, unlike a real red dot scope, this actually projects a beam onto the subject. Attaching it to the hotshoe is futile. At 5X magnification parallax will throw the aim way off. It is also impossible to shine the light beam in front of the macro lens. At 5X magnification we only have millimeters of working distance.

So I took a multi LED flashlight (uses 3AAA batteries) and a Winky brand hard plastic Pentax Q rear lens cap. This rear lens cap has real a plastic bayonet mount. This is very important. A slip on cap would be unlikely to hold the flashlight's weight. The flashlight must fit inside the rear lens cap bayonet.

To build the unit drill a hole in the center of the Winky lens cap. Then gradually enlarge the hole until the front of the flash light fits in very snuggly. If you want a cap for the front of the flashlight, when in storage, use the matching Winky body cap. Connect the two caps then shove the flashlight in. When it hits against the body cap, stop, take off the body cap. Now put a small bead of glue on the connection of the flashlight and rear lens cap. Let dry.

To use set up your Q macro system. Remove the Q body and attach the flashlight. Open lens aperture all the way and turn on flashlight. You will see a bright white dot or dots on the subject. Adjust for composition, lock all tripod controls down, then remove flashlight and re attach Q body.

The white dot in front of the bellows shows the Guide Light in action. It takes a few seonds to switch Q boy in and out. This is much better than the 20 minutes I have spent trying to find a subject at 5X. Seems to work well in testing. Can't wait to really use it.

thanks
barondla

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02-27-2017, 12:28 AM   #2
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WOW. Very cool.
02-27-2017, 07:56 AM   #3
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Excellent!

Here's an idea to further improve your setup:

1. Make a opaque mask that has a clear rectangular aperture the size of the Q sensor and put the mask over the front of the flashlight.

2. Mount the flashlight inside a plastic or cardboard tube glued to Winky lens cap the such that the mask is recessed exactly 9.2 mm (the Q's flange focal distance) from the cap.

Result: a rectangle of light showing the location, approximate field of view, and focus of the Q.
02-27-2017, 08:36 AM   #4
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You could also use two "lazers" adjusted to converge on the focus point. You'd probably have to build a jig on the hotshoe so they're fixed.Then you can turn them off for your images, or on to adjust your rail. Essentially this is like the "Dambusters" method for adjusting altitude for skip-bomb dropping.

02-27-2017, 05:50 PM   #5
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QuoteOriginally posted by TER-OR Quote
You could also use two "lazers" adjusted to converge on the focus point. You'd probably have to build a jig on the hotshoe so they're fixed.Then you can turn them off for your images, or on to adjust your rail. Essentially this is like the "Dambusters" method for adjusting altitude for skip-bomb dropping.
A+ for the historical analogy.

A+ for the laser idea.

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