Paul Corfield
Well-known member
Todays experimenting revolved around using a tiny microfiche projection lens for doing eyepiece projection onto the camera ccd. The small microfiche lens acts like a normal eyepiece on the scope and they are designed to have an incredibly flat field, much flatter than even the flattest astronomy eyepiece can deliver. After doing some research on astronomy forums I decided to purchase one and found a nice one on ebay for £20. It has six glass elements and it has only a 0.5% deviation of flatness across the whole field of view.
Eyepiece projection gives very high magnification and this is only to be used for when you need around 3X and beyond. The further you mount the lens from the camera ccd then the higher the mag.
Here's an example which is uncropped from 85m range and mag is around 4X to 5X. It's a warm day here today so allowing for some heat haze it's not bad. Sharper than I can get with other methods.
It's a method to be explored by spotting scope owners too, especially ones who have scopes that can use astro eyepieces. It will give way better results than they currently get with DSLR/T-mount methods for eyepiece projection.
Paul.
Eyepiece projection gives very high magnification and this is only to be used for when you need around 3X and beyond. The further you mount the lens from the camera ccd then the higher the mag.
Here's an example which is uncropped from 85m range and mag is around 4X to 5X. It's a warm day here today so allowing for some heat haze it's not bad. Sharper than I can get with other methods.
It's a method to be explored by spotting scope owners too, especially ones who have scopes that can use astro eyepieces. It will give way better results than they currently get with DSLR/T-mount methods for eyepiece projection.
Paul.
