# Microscope image doesnt display entire field of view when I switch to fluorescent bulb? **URL:** \ **Category:** Hardware\ **Created:** [February 4, 2024, 4:58pm UTC](https://forum.microlist.org/t/microscope-image-doesnt-display-entire-field-of-view-when-i-switch-to-fluorescent-bulb/2403 "2024-02-04T16:58:18Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Boone\_Jones](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.microlist.org/boone_jones/32/1367_2.png) [@Boone\_Jones](https://forum.microlist.org/u/Boone_Jones)\ **Post date:** [February 4, 2024, 4:58pm UTC](https://forum.microlist.org/t/microscope-image-doesnt-display-entire-field-of-view-when-i-switch-to-fluorescent-bulb/2403/1 "2024-02-04T16:58:18Z")
Im using a fluorescent microscope for the first time. When looking at the slide with bright field, I can see the entire image. However, when switching to just viewing using the fluorescent bulb, the image only appears as a small octogon. Ive altered just about every setting i can think of. It is an issue looking through the lens and digital. Thank you for your help ![17070658475566136255906000244681](https://us1.discourse-cdn.com/flex020/uploads/microlist/original/2X/7/79ccfafeeb2e64296111e68cde6d9c41cad27807.jpeg) ---
**Author:** ![Hazen\_Babcock](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.microlist.org/hazen_babcock/32/281_2.png) [@Hazen\_Babcock](https://forum.microlist.org/u/Hazen_Babcock)\ **Post date:** [February 5, 2024, 12:56pm UTC](https://forum.microlist.org/t/microscope-image-doesnt-display-entire-field-of-view-when-i-switch-to-fluorescent-bulb/2403/2 "2024-02-05T12:56:21Z")
It looks to me like there is an aperture somewhere in the path between your fluorescent light source and the objective that is partially closed. Perhaps if you provided a few more details about the microscope such as make and model others on the list would be able to help you further.