"X barlow showing light patch in DSLR image

[mackiedlm]

I'm planning to try some first time planetary with

8" Meade LX200 GPS, Canon EOS 1100D Backyard eos and a New 2X barlow.

Setting up today during daylight hours to practice set up and check out connections I find that on BYE frame and focus there is a definite lighter patch in the center of the FOV. The target is in focus. The light patch does not seem to be there when I visually use a 40mm eyepiece instead of the Camera. Also camera seems fine using other lenses or even my f 6.3 focal reducer

Is this just an artifact of using the set up during the day or does it indicate a problem with the barlow or incompatibility with my system.

Really appreciate any comments as Clear outside is predicting my first clear night in 3 months!!

thanks

David.

[Ruud]

I don't know, but it could be a reflection from the sensor back to the Barlow and then back to the sensor again.