I have a NF ATACR 7-35x56 F1 for which I need an IOTA. After reading a couple threads for DYI and where to buy, I thought maybe it can be done even easier.
If you know your way around Microsoft Word, you can make your own IOTA in ten minutes:
Worked for me like a charm, I got a crystal clear range target photo displayed on my computer between 15 and 25 feet.
I know this is not the usual "11-feet" the manufactured IOTAs advertise with, but for a DIY within ten minutes, it is just fine.
Once your measurements in the Word document are correct, you can screenshot the created IOTA. When you insert the screenshot in a new Word document, you can resize the picture and now create an IOTA for different scope sizes. Once the correct relation between outer and inner circle is established (Outer diameter divided by 3), the relation of the diameters stays consistent. So you only have to measure the scope diameter and adjust the outer circle in Word to the correct diameter, the inner circle will follow automatically in the correct relation to the outer diameter.
I am attaching the screenshot I took, unfortunately the Word doc is not accepted in the file attachments. If someone needs the Word Doc, let me know.
If you know your way around Microsoft Word, you can make your own IOTA in ten minutes:
- Measure the diameter of your scope opening
- Start a new document in Word
- Insert a circle (under shapes)
- Convert mm to inch and use the ruler on both sides of the Word document to adjust your circle to the desired diameter
- Format the circle to a black color
- Divide the scope opening diameter by 3 to arrive at the diameter for the interior opening
- Insert another circle and set it on top of the black circle, format this circle to white color
- Use the ruler on both sides of the Word document to make sure your white circle has the correct diameter
- Make sure the distance from the outer diameter (black circle) to the inner diameter (white circle) is the same on all sides (I measured all four sides)
- Once all is correct, make a test print
- If the size fits, copy and paste 3 or 4 of the same circles
- Print all of the circles on cardboard
- Cut them out, use fine rounded scissors or an X-Acto knife for the interior circle
- Depending on how heavy your cardboard is, glue 3-4 of the circles on top of each other
- If there is any white left in the inner circle, use a black sharpie and paint it black
- Either insert it into your scope opening or use painter's tape to affix it to the open scope closure ring
Worked for me like a charm, I got a crystal clear range target photo displayed on my computer between 15 and 25 feet.
I know this is not the usual "11-feet" the manufactured IOTAs advertise with, but for a DIY within ten minutes, it is just fine.
Once your measurements in the Word document are correct, you can screenshot the created IOTA. When you insert the screenshot in a new Word document, you can resize the picture and now create an IOTA for different scope sizes. Once the correct relation between outer and inner circle is established (Outer diameter divided by 3), the relation of the diameters stays consistent. So you only have to measure the scope diameter and adjust the outer circle in Word to the correct diameter, the inner circle will follow automatically in the correct relation to the outer diameter.
I am attaching the screenshot I took, unfortunately the Word doc is not accepted in the file attachments. If someone needs the Word Doc, let me know.
