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Here some information about reducer/flattener. A reducer has to be made for certain telescope and has to be in a defined position to imaging plane to work perfectly. However, often they work well enough at other telescopes. TeleVue has one for telescopes with a focal length from 800mm to 1000mm (#REF-3007). On a F10 refractor the field is already very flat, therefore the flattening is not an issue. But F10 means very long exposure times. Here is where the flattener really makes a difference, it makes your telescope F8. But on the other hand it increases the chromatic aberration enormously, as you have an achromatic refractor. The increase of chromatic aberration is a square function over the F number.
The bottom line is, you have to check if the Televue reducer/flattener works for your specific telescope. It might be better for you to use your telescope as it is for fotography. My suggestion is try the TeleVue reducer/flattener only if you can give it back to the dealer if it does not work.
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