ksAstroLens vs Starlapse

AstroLens turns your iPhone into a fully manual astrophotography camera, designed for afocal shooting through the Vaonis Hestia smartphone telescope. THE PROBLEM IT SOLVES When your iPhone sits on a telescope eyepiece, the native Camera app silently switches from the telephoto lens to the wide lens with a digital crop, because autofocus cannot converge through the optics. AstroLens locks the physical lens of your choice (the optical telephoto by default) and never switches away from it. Zoom stays at 1.0×: pure optical magnification, no digital crop. FULLY MANUAL, FULLY DETERMINISTIC • Manual focus slider with focus peaking and a magnifying loupe • One-tap mirror flip to correct the telescope's inverted image (preview and captures) • Manual shutter speed and ISO, bounded by the real sensor limits • Locked white balance for consistent colors across shots • Live histogram to nail the exposure MADE FOR THE NIGHT • Sun, Moon, Landscape and Deep Sky modes with sensible starting presets • Mandatory solar-filter confirmation before Sun mode • Crosshair, telescope-field circle and composition grid overlays • Red-on-black night theme to preserve your dark adaptation • 2-second self-timer and volume-button shutter to avoid vibrations • Apple Watch remote shutter: trigger from your wrist without touching the iPhone, with the mode, shutter speed and ISO on your watch • Burst capture for stacking deep-sky images • Apple ProRAW support (on compatible iPhones) plus HEIF • Captures saved to a dedicated “Hestia” album FIND YOUR TARGET • Sun/Moon alignment assistant: on-screen arrow plus turn and tilt guidance, computed from your location and the phone's motion sensors, fully offline • Works uncalibrated right away: the compass gets you close on its own; then center the target once in the eyepiece view and tap Calibrate for degree-level pointing • Adapter geometry is configurable (Hestia's mirrored optics by default) AstroLens works on any recent iPhone: without a telephoto lens it locks the main wide lens instead, still with zero automatic switching. Vaonis and Hestia are trademarks of their respective owner. AstroLens is an independent app, not affiliated with, endorsed by, or sponsored by Vaonis.

Photograph the night sky properly, on a phone that was never meant to. Starlapse locks the camera and keeps it locked. ISO, shutter, focus, white balance — set them once and they stay there for the whole session. No creeping exposure, no autofocus hunting in the dark and landing on nothing, no auto white balance turning the sky orange under a streetlight. Then it does the thing the hardware cannot do alone. An iPhone sensor caps a single frame at about one second, so exposures longer than that are built by stacking hundreds of frames. That is not a workaround — it is better. Noise falls as the square root of the frame count, and the same night's light can be developed as pinpoint stars or as star trails afterwards, because nothing is thrown away. WHAT IT DOES • Manual camera that holds — ISO, frame exposure, focus, white balance, lens choice • Autofocus on starlight — steps the lens and measures star size, the way observatories focus • Self-timer, 3 or 10 seconds, so touching the phone does not shake the first frames • Stacking from 10 seconds to a full hour of collected light • Pinpoint stars — frames aligned on the stars themselves, so they stay points • Star trails — the sky's rotation drawn as arcs, ground kept sharp • Night time-lapse where every frame of the video is its own stack • Meteor detector — watches the sky and saves a short clip around anything that crosses it • Aiming overlay showing planets, bright stars and the Moon — tap any of them for its name, constellation and brightness WHERE TO POINT Most apps show you where a shower's radiant is. Starlapse tells you where to aim, which is not the same place: meteors streak away from the radiant, so the longest trails appear 40° off to the side. It works that out from your location and the time, keeps you clear of the Moon, and picks a height a tripod can actually hold. FOCUS, WHICH IS THE HARD PART Autofocus cannot see a night sky — there is no contrast to hunt on — and the infinity mark is not exactly infinity: it is a mechanical end stop, and the sharp point sits slightly inside it, at a place that differs between lenses and drifts as the phone cools. Starlapse steps the lens across its range, measures how large the stars come out at each position, and settles on the smallest. It takes about a minute. DEVELOP AFTERWARDS The stack is kept as accumulated light, not as a finished picture. When the exposure ends you can move the curve (stretch, black point, exposure, saturation) and it re-develops from the original data. Same latitude a RAW file gives you. The curve is asinh, the one professional astronomical imaging uses. It lifts the faint Milky Way out of the noise while bright stars keep their cores and their colour instead of clipping to white discs. HONEST LIMITS • Aperture is fixed on iPhone. It is a property of the lens, not a setting. The app shows the f-number and what each lens gives up, and lets you choose — that is all any app can do here. • A single frame is about one second. Everything longer is stacked, and the interface always shows the arithmetic: "10 min of light = 600 × 1.00s". • Capture cannot run in the background. iOS stops the camera when an app leaves the screen. Starlapse keeps the screen on and dims it instead. • You need a tripod. An hour of stacking on a handheld phone is an hour of nothing. PRIVACY No account. Location and motion are used on the device to work out where to aim. What leaves the phone: the optional purchase below, to Apple; a usage counter you can switch off; and, only if you say yes, sky readings and photos for a light-pollution dataset (location to ~10 km, deletable in Settings). Source: github.com/fortunto2/starlapse. STARLAPSE PRO Everything above is free and stays free. Pro is the sky's events, bought once: tonight's showers with their rates, the aim target 40° off the radiant and clear of the Moon, and peak nights. Comets, eclipses and dark frames join Pro at no further cost.