  We present two long-working-distance objective lenses with numerical
apertures (NA) of 0.29 and 0.4 for single-atom experiments. The objective
lenses are assembled entirely by the commercial on-catalog $\Phi$1'' singlets.
Both the objectives are capable to correct the spherical aberrations due to the
standard flat vacuum glass windows with various thickness. The working
distances of NA$=0.29$ and NA$=0.4$ objectives are 34.6 mm and 18.2 mm,
respectively, at the design wavelength of 852 nm with 5-mm thick silica window.
In addition, the objectives can also be optimized to work at diffraction limit
at single wavelength in the entire visible and near infrared regions by
slightly tuning the distance between the first two lenses. The diffraction
limited fields of view for NA$=0.29$ and NA$=0.4$ objectives are 0.62 mm and
0.61 mm, and the spatial resolutions are 1.8 $\mu$m and 1.3 $\mu$m at the
design wavelength. The performances are simulated by the commercial ray-tracing
software and confirmed by imaging the resolution chart and a 1.18 $\mu$m
pinhole. The two objectives can be used for trapping and manipulating single
atoms of various species.
