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Magnetic step up ring filter adapter
The precisely designed magnetic Urth 62 77mm Magnetic Step Up Ring Lens Filter Adapter lets you attach larger filters to smaller lenses, so you can get more out of your gear with less equipment.


Highlights

Seamless adjustment, attach larger filters to smaller lenses.
Magnetic edge, attach and change filters instantly.
Aerospace quality durability, strong, lightweight 
Lifetime warranty, quality you can trust.

Flexibility and protection for your lens
Precision designed magnetic Step Up Rings give you the freedom to use larger filters on smaller lenses. So you get the most out of your gear and expand your creative possibilities. Made of durable 6061 aluminium, these rings are corrosion resistant and designed for long term use. The matte black anti reflective finish reduces glare, so your images always remain clear and high contrast.


Easy to use 
Check the diameter of your lens and filter via the Ø symbol, screw on the Step Up Ring firmly but gently and insert your magnetic filter. Thanks to the powerful magnets, the filter instantly clicks into place, with no fuss. When not in use, simply protect the filter with a lens cap. The ring is also easy to remove and store safely, so you're always ready for your next shot. ,

Material: 6061 aluminium 
Magnetic rim
Anti reflective finish
Threaded attachment
Corrosion resistant and durable
Compatibility: Magnetic lens filter range
 Specification
ZnačkaUrth
 Pro lepší péči
     
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    (function () { "use strict"; const CUT_OFF_HOUR = 7; // po 7:00 = start další prac. den /* ========================================================= MANUÁLNÍ DNY MIMO PROVOZ (dovolená, inventura, ...) Formát: "dd.mm" (bez roku) ========================================================= */ const EXTRA_BLOCKED_DATES_DDMM = [ // "03.02", // "04.02", // "15.08", ]; /* ========================================================= */ const ADDITION_SELECTOR = ".p_detail_info_box.p_detail_info_addition"; const AVAIL_SELECTOR = ".p_detail_availability"; const AVAIL_SPAN_SELECTOR = '.p_detail_availability span[data-variant="availability"]'; function pad2(n) { return String(n).padStart(2, "0"); } function formatDDMM(dateLocal) { return `${pad2(dateLocal.getDate())}.${pad2(dateLocal.getMonth() + 1)}.`; } // "Teď" v Europe/Prague (nezávisle na TZ uživatele) function nowInPragueParts() { const dtf = new Intl.DateTimeFormat("cs-CZ", { timeZone: "Europe/Prague", year: "numeric", month: "2-digit", day: "2-digit", hour: "2-digit", minute: "2-digit", second: "2-digit", hour12: false }); const parts = dtf.formatToParts(new Date()); const get = (type) => parts.find(p => p.type === type)?.value; return { year: Number(get("year")), month: Number(get("month")), day: Number(get("day")), hour: Number(get("hour")), minute: Number(get("minute")), second: Number(get("second")) }; } // UTC midnight helper (aby nepřekvapilo DST) function makeDateUTC(y, m, d) { return new Date(Date.UTC(y, m - 1, d, 0, 0, 0)); } function dateToKeyUTC(d) { return `${d.getUTCFullYear()}-${pad2(d.getUTCMonth() + 1)}-${pad2(d.getUTCDate())}`; } // Easter Sunday (Gregorian) function easterSunday(year) { const a = year % 19; const b = Math.floor(year / 100); const c = year % 100; const d = Math.floor(b / 4); const e = b % 4; const f = Math.floor((b + 8) / 25); const g = Math.floor((b - f + 1) / 3); const h = (19 * a + b - d - g + 15) % 30; const i = Math.floor(c / 4); const k = c % 4; const l = (32 + 2 * e + 2 * i - h - k) % 7; const m = Math.floor((a + 11 * h + 22 * l) / 451); const month = Math.floor((h + l - 7 * m + 114) / 31); const day = ((h + l - 7 * m + 114) % 31) + 1; return makeDateUTC(year, month, day); } function addExtraBlockedDatesToSet(holidaysSet, year, todayUTC) { EXTRA_BLOCKED_DATES_DDMM.forEach((ddmm) => { const m = ddmm.match(/^(\d{2})\.(\d{2})$/); if (!m) return; const dd = Number(m[1]); const mm = Number(m[2]); if (!Number.isFinite(dd) || !Number.isFinite(mm) || mm < 1 || mm > 12 || dd < 1 || dd > 31) return; const dThisYear = makeDateUTC(year, mm, dd); holidaysSet.add(dateToKeyUTC(dThisYear)); // pokud už datum letos proběhlo, přidáme i příští rok (praktické při údržbě) if (dThisYear.getTime() < todayUTC.getTime()) { const dNextYear = makeDateUTC(year + 1, mm, dd); holidaysSet.add(dateToKeyUTC(dNextYear)); } }); } function buildCZHolidaysSet(years, todayUTC) { const set = new Set(); years.forEach((y) => { // Fixní svátky CZ const fixed = [ [1, 1], [5, 1], [5, 8], [7, 5], [7, 6], [9, 28], [10, 28], [11, 17], [12, 24], [12, 25], [12, 26] ]; fixed.forEach(([mm, dd]) => set.add(dateToKeyUTC(makeDateUTC(y, mm, dd)))); // Velký pátek (-2) a Velikonoční pondělí (+1) const easter = easterSunday(y); const goodFriday = new Date(easter.getTime() - 2 * 24 * 3600 * 1000); const easterMonday = new Date(easter.getTime() + 1 * 24 * 3600 * 1000); set.add(dateToKeyUTC(goodFriday)); set.add(dateToKeyUTC(easterMonday)); // + ručně blokované dny addExtraBlockedDatesToSet(set, y, todayUTC); }); return set; } function isWeekendUTC(d) { const wd = d.getUTCDay(); return wd === 0 || wd === 6; } function isHolidayUTC(d, holidaysSet) { return holidaysSet.has(dateToKeyUTC(d)); } function isBusinessDayUTC(d, holidaysSet) { return !isWeekendUTC(d) && !isHolidayUTC(d, holidaysSet); } function nextBusinessDayUTC(d, holidaysSet) { let cur = new Date(d.getTime()); do { cur = new Date(cur.getTime() + 24 * 3600 * 1000); } while (!isBusinessDayUTC(cur, holidaysSet)); return cur; } function computeShipBaseUTC(holidaysSet) { const p = nowInPragueParts(); const todayUTC = makeDateUTC(p.year, p.month, p.day); const beforeCutoff = (p.hour < CUT_OFF_HOUR); // 0..6 if (beforeCutoff && isBusinessDayUTC(todayUTC, holidaysSet)) return todayUTC; // po cut-off nebo nepracovní den => nejbližší další pracovní den if (isBusinessDayUTC(todayUTC, holidaysSet)) return nextBusinessDayUTC(todayUTC, holidaysSet); let cur = new Date(todayUTC.getTime()); while (!isBusinessDayUTC(cur, holidaysSet)) { cur = new Date(cur.getTime() + 24 * 3600 * 1000); } return cur; } // "+N" pracovních dnů přesně function addBusinessDaysUTC(startUTC, n, holidaysSet) { let cur = new Date(startUTC.getTime()); let added = 0; while (added < n) { cur = new Date(cur.getTime() + 24 * 3600 * 1000); if (isBusinessDayUTC(cur, holidaysSet)) added++; } return cur; } function normalizeText(s) { return (s || "") .replace(/\u00A0/g, " ") .replace(/[–—]/g, "-") .replace(/\s+/g, " ") .trim(); } function parseAddition(text) { // "8 ks – doručení do 5 pracovních dnů" const t = normalizeText(text); const stockMatch = t.match(/(\d+)\s*ks/i); const daysMatch = t.match(/doru[cč]en[ií]\s*do\s*(\d+)\s*prac/i); if (!stockMatch || !daysMatch) return null; const stock = Number(stockMatch[1]); const leadDays = Number(daysMatch[1]); if (!Number.isFinite(stock) || !Number.isFinite(leadDays)) return null; return { stock, leadDays }; } function getAvailabilityMode() { const avail = document.querySelector(AVAIL_SELECTOR); if (!avail) return { mode: "unknown" }; const schemaLink = avail.querySelector('link[itemprop="availability"]'); const schemaHref = schemaLink?.getAttribute("href") || ""; const span = avail.querySelector(AVAIL_SPAN_SELECTOR); const label = normalizeText(span?.textContent || ""); if (/OutOfStock/i.test(schemaHref) || /Dostupnost k ověření/i.test(label)) { return { mode: "verify", avail, span, label }; } if (/^Skladem/i.test(label)) { return { mode: "local", avail, span, label }; } if (/^Centrální sklad/i.test(label)) { return { mode: "central", avail, span, label }; } return { mode: "unknown", avail, span, label }; } function removeExistingEstimate() { document.querySelectorAll(".delivery-estimate").forEach(el => el.remove()); } function insertEstimateUnderSpan(spanEl, dateDDMM) { removeExistingEstimate(); if (!spanEl || !spanEl.parentNode) return; const line = document.createElement("span"); line.className = "delivery-estimate"; line.textContent = `Obdržíte do ${dateDDMM}`; spanEl.insertAdjacentElement("afterend", line); } function applyDeliveryLogic() { const addition = document.querySelector(ADDITION_SELECTOR); if (addition) addition.classList.add("delivery-hide"); const { mode, span } = getAvailabilityMode(); // verify/unknown => jen schovat addition a nic nepřidávat if (mode === "verify" || mode === "unknown") { removeExistingEstimate(); return; } const p = nowInPragueParts(); const todayUTC = makeDateUTC(p.year, p.month, p.day); const holidays = buildCZHolidaysSet([p.year, p.year + 1], todayUTC); // lokální sklad => +1 prac. den if (mode === "local") { const shipBase = computeShipBaseUTC(holidays); const deliveryUTC = addBusinessDaysUTC(shipBase, 1, holidays); insertEstimateUnderSpan(span, formatDDMM(new Date(deliveryUTC.getTime()))); return; } // centrální sklad => vyčíst z addition if (mode === "central") { const parsed = addition ? parseAddition(addition.textContent) : null; // parsing selže nebo stock=0 => nic nepřidávat if (!parsed || parsed.stock <= 0) { removeExistingEstimate(); return; } const shipBase = computeShipBaseUTC(holidays); const deliveryUTC = addBusinessDaysUTC(shipBase, parsed.leadDays, holidays); if (span) span.textContent = `Centrální sklad ${parsed.stock} ks`; insertEstimateUnderSpan(span, formatDDMM(new Date(deliveryUTC.getTime()))); } } if (document.readyState === "loading") { document.addEventListener("DOMContentLoaded", applyDeliveryLogic); } else { applyDeliveryLogic(); } })();