The refractor is built based on 3-element Super ED lens (air spaced). This ensures almost perfect colour correction. It is so good that there is no need to use minus IR filter for CCD imaging.
Unfortunately in comparison to TV101 I used to own it does not have enough flat field even for relatively small chip of Canon 10D not even mentioning 35-mm format. But with a field flattener it is possible to take images even with medium size analog cameras.
TMB 115 can be purchased in two versions: CNC and LW. The difference between them is the finish and weight of the tube. LW version is much lighter and has a different focuser. Mine is CNC - namely "a tank" but 12 kg for the tube, rings and diagonal so the weight is not for any entry-level mount. |
