Diopter Test Shots

 

These photos were taken underwater using a Tamron 90mm macro lens on a Tamron 2x Teleconverter.  I used either a +4, a +2, or no screw-in diopter, and made test images with and without the push-on diopter.  For each different screw-in diopter choice I made a Depth of Field test image with the push-on diopter.  This was done by holding a ruler at about a 45 degree angle to the film plane.  DOF in 64^th’s of an inch can be read by counting how many 1/64” ruler lines are in acceptable focus and dividing the number by 2.

 

___________________________________________________________________________________________________________________________

 

.

Photo taken with Tamron 90mm macro lens on a Tamron 2x Teleconverter with no screw-on diopter and o push-on diopter
This photo was taken with a Tamron 90mm macro lens on a Tamron 2x Teleconverter with no screw-in and no push –on diopter

 

 This photo was taken with Tamron 90mm Tamoron 2x Teleconverter, no screw-on diopter, and a +2  push-on diopter.  Notice the width of 47/64^th’s without the push-on diopter and 41/64th’s with, representing a 14.63% increase in magnification when using the push-on diopter. 

This photo shows Depth of Field.  The ruler is held at aproximately 45 degrees to the film plane, so the 1/64^th inch markings represent 1/128 inch..   DOF is very good at about 6/64^th’s of an inch with the dipoter on.

 

___________________________________________________________________________________________________________________________

 

 

 

This photo was taken with a Tamron 90mm and a Tamron  2x Teleconverter with a +2 screw-on diopter and no push-on diopter.

 

 

 

This photo was taken with Tamron 90mm and a Tamron 2x  teleconverter with a +2  screw-on diopter and a +2 push-on diopter.  .  Notice 43/64^th’s without the push-on diopter and 38/64th’s with, representing a 13.16% increase in magnification. 

This photo shows Depth of Field.. The ruler is held at aproximately 45 degrees to the film plane, so the 1/64^th inch  markings represent 1/128 inchDOF is still very good at about 5/64^th’s of an inch with the dipoter on.

 

___________________________________________________________________________________________________________________________

 

 

 This photo taken with a Tamron 90mm Tamron and a 2x Teleconverter with a +4 screw-on diopter and no push-on diopter .

 

 

 

 

 

 

 

 

This photo taken with a Tamron 90mm and aTamron 2x Teleconverter with a +4  screw-on diopter and a+2 push-on diopter.  Notice 36/64^th’s without the push-on diopter and 33/64th’s with, representing an 8.336% increase in magnification.

 

 

This photo shows Depth of Field using a +4 diopter in the housing and a +2 push-on diopter.  The ruler is held at aproximately 45 degrees to the film plane, so the 1/64^th inch markings represent 1/128 inch.  DOF is very difficult to manage at about 3/64^th’s of an inch.

 

Back