tem op• Data kinds: none → image2d (an op determined by its arguments alone — it takes no image or data input)
• Call: import fullseye as fs; fs.ledger.tem_ctf(shape=256, pixel_A=1.0, kv=300.0, cs_mm=2.7, defocus_A=10000.0, astig_A=0.0, astig_angle_deg=None, amplitude_contrast=0.07, phase_shift_deg=0.0, alpha_mrad=0.0, focal_spread_A=0.0, envelope=True) (to call the implementation directly, import temsim; temsim.tem_ctf(shape=256, pixel_A=1.0, kv=300.0, cs_mm=2.7, defocus_A=10000.0, astig_A=0.0, astig_angle_deg=None, amplitude_contrast=0.07, phase_shift_deg=0.0, alpha_mrad=0.0, focal_spread_A=0.0, envelope=True); from the registry, opsoptics.get("tem_ctf"))
2-D contrast transfer function (DC at the centre, fftshift order, shape shape).
> The detailed description below is the original text — the summary and the headings are translated.
CTF = −sin(χ + arcsin w) × E_s × E_t。defocus_A は平均の焦点外れ(正 = アンダーフォーカス)、astig_A は Δf_u − Δf_v(≥ 0)、astig_angle_deg は Δf_u の軸の向き(+x から +y へ)。alpha_mrad は照明の半角、focal_spread_A は焦点の広がりの rms(どちらも 0 で包絡なし)。envelope=False で包絡を掛けない。パワースペクトルのリング(Thon リング)は CTF² の明暗。
Every optics op validates its input before computing (nothing slips through silently):
• Units are baked into the argument name — _mm / _um / _deg / _mrad. Confusing mm with µm does not crash; it yields a plausible-looking wrong answer, so the name prevents it. Nothing here guesses the unit from the magnitude.
• Strings raise ValueError — float('50') succeeds, so an unparsed configuration value would slip through as a length (measured: thin_lens('50', '200') returned a plausible 66.667 mm). bool is refused too, as the implicit promotion True == 1.
• complex / masked arrays raise ValueError (real-valued slots only; silently dropping the imaginary part or peeling off the mask is refused). NaN/Inf raises ValueError on every input.
• Division by zero and its relatives are refused by name: focal length 0, radius of curvature 0, refractive index <= 0, a fully opaque aperture (all zeros, so the normalisation is 0/0), a PSF whose sum is <= 0, a Stokes vector with S0 = 0, and an object sitting at the front focal point (the image is at infinity).
• Only two ops return a non-finite value, and both state it as a contract: depth_of_field returns far_mm = inf beyond the hyperfocal distance (that is what the hyperfocal distance means), and gaussian_beam returns wavefront_radius_mm = inf at the waist (the radius of curvature of a plane wavefront). Both also return a finite companion (far_is_infinite / curvature_per_mm). Any other silent NaN/Inf is detected internally and raises ValueError — "float64 overflowed" and "the answer is infinite" are different claims, so the first is never returned wearing the face of the second.
• Size caps: generated grids are capped by optics.MAX_GRID (4096); supplied fields/PSFs/apertures by optics.MAX_FIELD_ELEMENTS (2^24); ABCD element chains by optics.MAX_SYSTEM_ELEMENTS (1024); Zernike by MAX_ZERNIKE_TERMS (512) / MAX_ZERNIKE_ORDER (40) / MAX_ZERNIKE_BASIS (2^25). This closes, fail-closed, the paths where a small argument triggers a huge internal allocation (measured: n_max=40 × 4096² needs 108 GB).
• Physically impossible states are refused too: a Stokes vector with degree of polarisation > 1, negative transmittance, negative intensity, and invalid Zernike indices such as n-|m| odd.
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
• poc_tem_ctf_thon_rings — py -3.11 examples/poc_tem_ctf_thon_rings.py
image2d as input)fraunhofer_pattern · pupil_psf · pupil_blur · psf_to_mtf · edge_spread · veiling_glare_index · emva_pair_statistics · emva_defect_pixels
tem)tem_wavelength · tem_scherzer · tem_ctf_profile · tem_projected_potential · tem_amorphous_film · tem_image_weak_phase · tem_multislice · tem_power_spectrum
*Provenance: temsim.py — OPTICS operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.