====== Company Summary ====== ===== True Lens Service ===== {{ :mfg:tls_logo.png?direct&200|}}**Company Website:** https://www.truelens.co.uk/\\ **Duclos Page:** https://www.ducloslenses.com/collections/tls\\ True Lens Services are one of the UK’s largest lens rehousing and service providers and now recognised worldwide for their lens innovation with an unbeatable reputation in the design, manufacture, and servicing of filming lenses. In September 2020, TLS announced a successful management buyout, allowing TLS to become independent from Procam Television Holdings. This was a step into the future, alongside Foresight Group who had backed the transaction and has provided further investment to support the international growth of TLS and new product development. The team at TLS are quite a creative bunch with a passion for the filming industry. Whether you are hoping to rehouse your lenses and bring them up to date or you simply need to give your lenses a quick service, our team holds a vast wealth of lenses knowledge to give you the confidence to trust us with your lenses and the peace of mind to return your lenses to you in top working order. TLS most recent innovative product is the Vega lenses, which are on sale now. We are very proud of these lenses, as they have been designed and manufactured inhouse and are currently proving to be a great success. The most recent rehousing projects that we now offer is for the Mamiya 645 and the Lomo Anamorphic round front lenses. -- ====== Lens Models ====== ===== Rehoused Lenses ===== ==== Bausch & Lomb Super Baltar ==== [[lens:TLSB&LSuper Baltar20mmT2.3|TLS B&L Super Baltar 20mm T2.3 ]]\\ [[lens:TLSB&LSuper Baltar25mmT2.3|TLS B&L Super Baltar 25mm T2.3 ]]\\ [[lens:TLSB&LSuper Baltar35mmT2.3|TLS B&L Super Baltar 35mm T2.3 ]]\\ [[lens:TLSB&LSuper Baltar50mmT2.3|TLS B&L Super Baltar 50mm T2.3 ]]\\ [[lens:TLSB&LSuper Baltar75mmT2.3|TLS B&L Super Baltar 75mm T2.3 ]]\\ [[lens:TLSB&LSuper Baltar100mmT2.3|TLS B&L Super Baltar 100mm T2.3 ]]\\ [[lens:TLSB&LSuper Baltar152mmT3|TLS B&L Super Baltar 152mm T3 ]]\\ [[lens:TLSB&LSuper Baltar228mmT4|TLS B&L Super Baltar 228mm T4 ]]\\ ==== Bausch & Lomb Neo Super Baltar ==== [[lens:TLSB&LNeo Super Baltar20mmT2.3|TLS B&L Neo Super Baltar 20mm T2.3 ]]\\ [[lens:TLSB&LNeo Super Baltar25mmT2.3|TLS B&L Neo Super Baltar 25mm T2.3 ]]\\ [[lens:TLSB&LNeo Super Baltar35mmT2.3|TLS B&L Neo Super Baltar 35mm T2.3 ]]\\ [[lens:TLSB&LNeo Super Baltar50mmT2.3|TLS B&L Neo Super Baltar 50mm T2.3 ]]\\ [[lens:TLSB&LNeo Super Baltar75mmT2.3|TLS B&L Neo Super Baltar 75mm T2.3 ]]\\ [[lens:TLSB&LNeo Super Baltar100mmT2.3|TLS B&L Neo Super Baltar 100mm T2.3 ]]\\ [[lens:TLSB&LNeo Super Baltar152mmT3|TLS B&L Neo Super Baltar 152mm T3 ]]\\ ==== Canon FD ==== [[lens:TLSCanonFD (Optex)10mmT2.9|TLS Canon FD (Optex) 10mm T2.9 ]]\\ [[lens:TLSCanonEF MKI14mmT2.9|TLS Canon EF MKI 14mm T2.9 ]]\\ [[lens:TLSCanonFD/FD L14mmT2.9|TLS Canon FD/FD L 14mm T2.9 ]]\\ [[lens:TLSCanonFD Fisheye15mmf/2.8|TLS Canon FD Fisheye 15mm f/2.8 ]]\\ [[lens:TLSCanonFD-X (Angenieux front)18mmT1.6|TLS Canon FD-X (Angenieux front) 18mm T1.6 ]]\\ [[lens:TLSCanonFD SSC/NFD20mmT2.9|TLS Canon FD SSC/NFD 20mm T2.9 ]]\\ [[lens:TLSCanonFD SSC Asperical/FD L24mmT1.5|TLS Canon FD SSC Asperical/FD L 24mm T1.5 ]]\\ [[lens:TLSCanonFD SSC/NFD28mmT2.1|TLS Canon FD SSC/NFD 28mm T2.1 ]]\\ [[lens:TLSCanonFD SSC/NFD35mmT2.1|TLS Canon FD SSC/NFD 35mm T2.1 ]]\\ [[lens:TLSCanonFD-X35mmT1.5|TLS Canon FD-X 35mm T1.5 ]]\\ [[lens:TLSCanonFD-X45mmT1.5|TLS Canon FD-X 45mm T1.5 ]]\\ [[lens:TLSCanonFD50mmT1.3|TLS Canon FD 50mm T1.3 ]]\\ [[lens:TLSCanonFD SSC Asperical55mmT1.3|TLS Canon FD SSC Asperical 55mm T1.3 ]]\\ [[lens:TLSCanonFD-X70mmT1.3|TLS Canon FD-X 70mm T1.3 ]]\\ [[lens:TLSCanonFD SSC Aspherical/FD L85mmT1.3|TLS Canon FD SSC Aspherical/FD L 85mm T1.3 ]]\\ [[lens:TLSCanonNFD100mmT2.1|TLS Canon NFD 100mm T2.1 ]]\\ [[lens:TLSCanonFD135mmT2.1|TLS Canon FD 135mm T2.1 ]]\\ [[lens:TLSCanonNFD200mmT2.9|TLS Canon NFD 200mm T2.9 ]]\\ ==== Canon K35 ==== [[lens:TLSCanonK3518mmT2.8|TLS Canon K35 18mm T2.8 ]]\\ [[lens:TLSCanonK3518mmT1.5|TLS Canon K35 18mm T1.5 ]]\\ [[lens:TLSCanonK3524mmT1.6|TLS Canon K35 24mm T1.6 ]]\\ [[lens:TLSCanonK3535mmT1.4|TLS Canon K35 35mm T1.4 ]]\\ [[lens:TLSCanonK3550mmT1.3|TLS Canon K35 50mm T1.3 ]]\\ [[lens:TLSCanonK3555mmT1.3|TLS Canon K35 55mm T1.3 ]]\\ [[lens:TLSCanonK3585mmT1.3|TLS Canon K35 85mm T1.3 ]]\\ ==== Canon Rangefinder ==== [[lens:TLSCanonf3.5 FL19mm-|TLS Canon f/3.5 FL 19mm - ]]\\ [[lens:TLSCanonf1.525mmT1.8|TLS Canon f/1.5 25mm T1.8 ]]\\ [[lens:TLSCanonf1.7/f1.825mmT2.1|TLS Canon f/1.7/f1.8 25mm T2.1 ]]\\ [[lens:TLSCanonf1.528mmT1.8|TLS Canon f/1.5 28mm T1.8 ]]\\ [[lens:TLSCanonf1.828mmT2.1|TLS Canon f/1.8 28mm T2.1 ]]\\ [[lens:TLSCanonf1.535mmT1.6|TLS Canon f/1.5 35mm T1.6 ]]\\ [[lens:TLSCanonf1.835mm-|TLS Canon f/1.8 35mm - ]]\\ [[lens:TLSCanonCanonet f1.740mmT1.8|TLS Canon Canonet f/1.7 40mm T1.8 ]]\\ [[lens:TLSCanonf0.9550mmT1.1|TLS Canon f/0.95 50mm T1.1 ]]\\ [[lens:TLSCanonf1.2 FL58mmT1.4|TLS Canon f/1.2 FL 58mm T1.4 ]]\\ [[lens:TLSCanonf1.885mm-|TLS Canon f/1.8 85mm - ]]\\ [[lens:TLSCanonf1.585mmT1.6|TLS Canon f/1.5 85mm T1.6 ]]\\ [[lens:TLSCanonf1.8 FL85mm-|TLS Canon f/1.8 FL 85mm - ]]\\ [[lens:TLSCanonf2100mmT2.1|TLS Canon f/2 100mm T2.1 ]]\\ [[lens:TLSCanonf2.5 SC FD135mmT2.8|TLS Canon f/2.5 SC FD 135mm T2.8 ]]\\ [[lens:TLSCanonf2.5 FL135mmT2.8|TLS Canon f/2.5 FL 135mm T2.8 ]]\\ ==== Cooke Speed Panchros ==== [[lens:TLSCookeSpeed Panchro S1/218mmT2.2|TLS Cooke Speed Panchro S1/2 18mm T2.2 ]]\\ [[lens:TLSCookeSpeed Panchro S318mmT2.2|TLS Cooke Speed Panchro S3 18mm T2.2 ]]\\ [[lens:TLSCookeSpeed Panchro S225mmT2.2|TLS Cooke Speed Panchro S2 25mm T2.2 ]]\\ [[lens:TLSCookeSpeed Panchro S325mmT2.2|TLS Cooke Speed Panchro S3 25mm T2.2 ]]\\ [[lens:TLSCookeSpeed Panchro S1/228mmT2.2|TLS Cooke Speed Panchro S1/2 28mm T2.2 ]]\\ [[lens:TLSCookeSpeed Panchro S1/232mmT2.3|TLS Cooke Speed Panchro S1/2 32mm T2.3 ]]\\ [[lens:TLSCookeSpeed Panchro S1/235mmT2.3|TLS Cooke Speed Panchro S1/2 35mm T2.3 ]]\\ [[lens:TLSCookeSpeed Panchro S1/240mmT2.3|TLS Cooke Speed Panchro S1/2 40mm T2.3 ]]\\ [[lens:TLSCookeSpeed Panchro S1/250mmT2.3|TLS Cooke Speed Panchro S1/2 50mm T2.3 ]]\\ [[lens:TLSCookeSpeed Panchro S1/275mmT2.3|TLS Cooke Speed Panchro S1/2 75mm T2.3 ]]\\ [[lens:TLSCookeSpeed Panchro DFP100mmT2.8|TLS Cooke Speed Panchro DFP 100mm T2.8 ]]\\ ==== Cooke Double Speed Panchros ==== [[lens:TLSCookeDouble Speed Panchro30mmT3|TLS Cooke Double Speed Panchro 30mm T3 ]]\\ [[lens:TLSCookeDouble Speed Panchro75mmT2.3|TLS Cooke Double Speed Panchro 75mm T2.3 ]]\\ ==== Cooke Kinetals ==== [[lens:TLSCookeKinetal100mmT2.8|TLS Cooke Kinetal 100mm T2.8 ]]\\ [[lens:TLSCookeKinetal150mmT4|TLS Cooke Kinetal 150mm T4 ]]\\ ==== Cooke Telepanchros ==== [[lens:TLSCookeTelepanchro152mmT3.2|TLS Cooke Telepanchro 152mm T3.2 ]]\\ [[lens:TLSCookeTelepanchro203mmT4.5|TLS Cooke Telepanchro 203mm T4.5 ]]\\ ==== Kowa R ==== [[lens:TLSKowaR19mmT4|TLS Kowa R 19mm T4 ]]\\ [[lens:TLSKowaR28mmT3.6|TLS Kowa R 28mm T3.6 ]]\\ [[lens:TLSKowaR35mmT2.9|TLS Kowa R 35mm T2.9 ]]\\ [[lens:TLSKowaR50mmT1.9|TLS Kowa R 50mm T1.9 ]]\\ [[lens:TLSKowaR85mmT2.9|TLS Kowa R 85mm T2.9 ]]\\ [[lens:TLSKowaR100mmT3.6|TLS Kowa R 100mm T3.6 ]]\\ [[lens:TLSKowaR135mmT3.9|TLS Kowa R 135mm T3.9 ]]\\ ==== Kowa Cine Prominar Sphericals ==== [[lens:TLSKowaCine Prominar Spherical15mmT4|TLS Kowa Cine Prominar Spherical 15mm T4 ]]\\ [[lens:TLSKowaCine Prominar Spherical20mmT2.6|TLS Kowa Cine Prominar Spherical 20mm T2.6 ]]\\ [[lens:TLSKowaCine Prominar Spherical25mmT2.3|TLS Kowa Cine Prominar Spherical 25mm T2.3 ]]\\ [[lens:TLSKowaCine Prominar Spherical32mmT2.3|TLS Kowa Cine Prominar Spherical 32mm T2.3 ]]\\ [[lens:TLSKowaCine Prominar Spherical40mmT2.3|TLS Kowa Cine Prominar Spherical 40mm T2.3 ]]\\ [[lens:TLSKowaCine Prominar Spherical50mmT2.3|TLS Kowa Cine Prominar Spherical 50mm T2.3 ]]\\ [[lens:TLSKowaCine Prominar Spherical75mmT2.3|TLS Kowa Cine Prominar Spherical 75mm T2.3 ]]\\ [[lens:TLSKowaCine Prominar Spherical100mmT2.6|TLS Kowa Cine Prominar Spherical 100mm T2.6 ]]\\ ==== Leica Noctilux ==== [[lens:TLSLeicaNoctilux50mmT0.95|TLS Leica Noctilux 50mm T0.95 ]]\\ ==== Leica-R ==== [[lens:TLSLeica-R15mmT4.0|TLS Leica-R 15mm T4.0 ]]\\ [[lens:TLSLeica-R19mmv1T2.9|TLS Leica-R 19mm V1 T2.9 ]]\\ [[lens:TLSLeica-R19mmv2T2.9|TLS Leica-R 19mm V2 T2.9 ]]\\ [[lens:TLSLeica-R21mmT4.2|TLS Leica-R 21mm T4.2 ]]\\ [[lens:TLSLeica-R24mmT2.9|TLS Leica-R 24mm T2.9 ]]\\ [[lens:TLSLeica-R28mmv1T2.9|TLS Leica-R 28mm V1 T2.9 ]]\\ [[lens:TLSLeica-R28mmv2T2.9|TLS Leica-R 28mm V2 T2.9 ]]\\ [[lens:TLSLeica-R35mmT2.1|TLS Leica-R 35mm T2.1 ]]\\ [[lens:TLSLeica-R35mmT1.5|TLS Leica-R 35mm T1.5 ]]\\ [[lens:TLSLeica-R50mmT2.1|TLS Leica-R 50mm T2.1 ]]\\ [[lens:TLSLeica-R50mmT1.5|TLS Leica-R 50mm T1.5 ]]\\ [[lens:TLSLeica-R60mmT2.9|TLS Leica-R 60mm Macro T2.9 ]]\\ [[lens:TLSLeica-R80mmT1.5|TLS Leica-R 80mm T1.5 ]]\\ [[lens:TLSLeica-R90mmT2.1|TLS Leica-R 90mm T2.1 ]]\\ [[lens:TLSLeica-R100mmT2.9|TLS Leica-R 100mm Macro T2.9 ]]\\ [[lens:TLSLeica-R135mmT2.9|TLS Leica-R 135mm T2.9 ]]\\ [[lens:TLSLeica-R180mmT2.9|TLS Leica-R 180mm T2.9 ]]\\ ==== Lomo Anamorphic ==== [[lens:TLSLomoAnamorphic35mmT2.5|TLS Lomo Anamorphic 35mm T2.5 ]]\\ [[lens:TLSLomoAnamorphic50mmT2.5|TLS Lomo Anamorphic 50mm T2.5 ]]\\ [[lens:TLSLomoAnamorphic75mmT2.5|TLS Lomo Anamorphic 75mm T2.5 ]]\\ [[lens:TLSLomoAnamorphic100mmT2.4|TLS Lomo Anamorphic 100mm T2.4 ]]\\ [[lens:TLSLomoAnamorphic150mmT4|TLS Lomo Anamorphic 150mm T4 ]]\\ ==== Macro ==== [[lens:TLS-Macro60mmT3|TLS Macro 60mm T3 ]]\\ ==== Mamiya 645 ==== [[lens:TLSMamiya64524mm Fisheye-|TLS Mamiya 645 24mm Fisheye - ]]\\ [[lens:TLSMamiya64535mmT3.6|TLS Mamiya 645 35mm T3.6 ]]\\ [[lens:TLSMamiya64545mmT2.9|TLS Mamiya 645 45mm T2.9 ]]\\ [[lens:TLSMamiya64555mmT2.9|TLS Mamiya 645 55mm T2.9 ]]\\ [[lens:TLSMamiya64570mmT2.9|TLS Mamiya 645 70mm T2.9 ]]\\ [[lens:TLSMamiya64580mmT2|TLS Mamiya 645 80mm T2 ]]\\ [[lens:TLSMamiya64580mmT2.9|TLS Mamiya 645 80mm T2.9 ]]\\ [[lens:TLSMamiya645110mmT2.9|TLS Mamiya 645 110mm T2.9 ]]\\ [[lens:TLSMamiya645150mmT2.9|TLS Mamiya 645 150mm T2.9 ]]\\ [[lens:TLSMamiya645150mmT3.6|TLS Mamiya 645 150mm T3.6 ]]\\ ==== Mamiya 645 (built-in Speedbooster) ==== [[lens:TLSMamiya645 (built-in Speedbooster17mm FisheyeT3.3|TLS Mamiya 645 (built-in Speedbooster 17mm Fisheye T3.3 ]]\\ [[lens:TLSMamiya645 (built-in Speedbooster25mmT2.8|TLS Mamiya 645 (built-in Speedbooster 25mm T2.8 ]]\\ [[lens:TLSMamiya645 (built-in Speedbooster32mmT2.3|TLS Mamiya 645 (built-in Speedbooster 32mm T2.3 ]]\\ [[lens:TLSMamiya645 (built-in Speedbooster39mmT2.3|TLS Mamiya 645 (built-in Speedbooster 39mm T2.3 ]]\\ [[lens:TLSMamiya645 (built-in Speedbooster50mmT2.3|TLS Mamiya 645 (built-in Speedbooster 50mm T2.3 ]]\\ [[lens:TLSMamiya645 (built-in Speedbooster57mmT2.3|TLS Mamiya 645 (built-in Speedbooster 57mm T2.3 ]]\\ [[lens:TLSMamiya645 (built-in Speedbooster57mmT1.6|TLS Mamiya 645 (built-in Speedbooster 57mm T1.6 ]]\\ [[lens:TLSMamiya645 (built-in Speedbooster78mmT2.3|TLS Mamiya 645 (built-in Speedbooster 78mm T2.3 ]]\\ [[lens:TLSMamiya645 (built-in Speedbooster107mmT2.2|TLS Mamiya 645 (built-in Speedbooster 107mm T2.2 ]]\\ [[lens:TLSMamiya645 (built-in Speedbooster107mmT2.6|TLS Mamiya 645 (built-in Speedbooster 107mm T2.6 ]]\\ ==== Morpheus (Nikon zoom) ==== [[lens:TLSNikonMorpheus80-200mmT2.8|TLS Nikon Morpheus 80-200mm T2.8 ]]\\ ==== Petzvals ==== [[lens:TLSPetzval-58mmT2.1|TLS Petzval 58mm T2.1 ]]\\ [[lens:TLSPetzval-85mmT2.3|TLS Petzval 85mm T2.3 ]]\\ ==== Vega (Nikon primes) ==== [[lens:TLSNikonVega20mmT2|TLS Nikon Vega 20mm T2 ]]\\ [[lens:TLSNikonVega24mmT1.5|TLS Nikon Vega 24mm T1.5 ]]\\ [[lens:TLSNikonVega35mmT1.5|TLS Nikon Vega 35mm T1.5 ]]\\ [[lens:TLSNikonVega50mmT1.5|TLS Nikon Vega 50mm T1.5 ]]\\ [[lens:TLSNikonVega58mmT1.5|TLS Nikon Vega 58mm T1.5 ]]\\ [[lens:TLSNikonVega85mmT1.5|TLS Nikon Vega 85mm T1.5 ]]\\ [[lens:TLSNikonVega105mmT1.5|TLS Nikon Vega 105mm T1.5 ]]\\ [[lens:TLSNikonVega135mmT2|TLS Nikon Vega 135mm T2 ]]\\ ==== ZEISS B Speed ==== [[lens:TLSZeissB Speed18mmT1.4|TLS ZEISS B Speed 18mm T1.4 ]]\\ [[lens:TLSZeissB Speed25mmT1.4|TLS ZEISS B Speed 25mm T1.4 ]]\\ [[lens:TLSZeissB Speed35mmT1.4|TLS ZEISS B Speed 35mm T1.4 ]]\\ [[lens:TLSZeissB Speed50mmT1.4|TLS ZEISS B Speed 50mm T1.4 ]]\\ [[lens:TLSZeissB Speed85mmT1.4|TLS ZEISS B Speed 85mm T1.4 ]]\\ ==== ZEISS Contax ==== [[lens:TLSZeissContax15mmT|TLS ZEISS Contax 15mm T(TBD) ]]\\ [[lens:TLSZeissContax18mmT4.4|TLS ZEISS Contax 18mm T4.4 ]]\\ [[lens:TLSZeissContax21mmT3.2|TLS ZEISS Contax 21mm T3.2 ]]\\ [[lens:TLSZeissContax25mmT3|TLS ZEISS Contax 25mm T3 ]]\\ [[lens:TLSZeissContax28mmT2.2|TLS ZEISS Contax 28mm T2.2 ]]\\ [[lens:TLSZeissContax35mmT1.6|TLS ZEISS Contax 35mm T1.6 ]]\\ [[lens:TLSZeissContax45mmT|TLS ZEISS Contax 45mm T(TBD) ]]\\ [[lens:TLSZeissContax50mmT1.6|TLS ZEISS Contax 50mm T1.6 ]]\\ [[lens:TLSZeissContax60mmT|TLS ZEISS Contax 60mm T(TBD) ]]\\ [[lens:TLSZeissContax85mmT1.6|TLS ZEISS Contax 85mm T1.6 ]]\\ [[lens:TLSZeissContax100mmT2.1|TLS ZEISS Contax 100mm T2.1 ]]\\ [[lens:TLSZeissContax135mmT2.1|TLS ZEISS Contax 135mm T2.1 ]]\\ [[lens:TLSZeissContax150mmT|TLS ZEISS Contax 150mm T(TBD) ]]\\ [[lens:TLSZeissContax180mmT|TLS ZEISS Contax 180mm T(TBD) ]]\\ ==== ZEISS Standard Speed ==== [[lens:TLSZeissStandard Speed16mmT2.1|TLS ZEISS Standard Speed 16mm T2.1 ]]\\ [[lens:TLSZeissStandard Speed20mmT2.1|TLS ZEISS Standard Speed 20mm T2.1 ]]\\ [[lens:TLSZeissStandard Speed24mmT2.1|TLS ZEISS Standard Speed 24mm T2.1 ]]\\ [[lens:TLSZeissStandard Speed28mmT2.1|TLS ZEISS Standard Speed 28mm T2.1 ]]\\ [[lens:TLSZeissStandard Speed32mmT2.1|TLS ZEISS Standard Speed 32mm T2.1 ]]\\ [[lens:TLSZeissStandard Speed40mmT2.1|TLS ZEISS Standard Speed 40mm T2.1 ]]\\ [[lens:TLSZeissStandard Speed50mmT2.1|TLS ZEISS Standard Speed 50mm T2.1 ]]\\ [[lens:TLSZeissStandard Speed85mmT2.1|TLS ZEISS Standard Speed 85mm T2.1 ]]\\ [[lens:TLSZeissStandard Speed100mmT2.1|TLS ZEISS Standard Speed 100mm T2.1 ]]\\ [[lens:TLSZeissStandard Speed135mmT2.1|TLS ZEISS Standard Speed 135mm T2.1 ]]\\ ==== ZEISS Super Speed MKII/MKIII ==== [[lens:TLSZeissSuper Speed18mmT1.3|TLS ZEISS Super Speed 18mm T1.3 ]]\\ [[lens:TLSZeissSuper Speed25mmT1.3|TLS ZEISS Super Speed 25mm T1.3 ]]\\ [[lens:TLSZeissSuper Speed35mmT1.3|TLS ZEISS Super Speed 35mm T1.3 ]]\\ [[lens:TLSZeissSuper Speed50mmT1.3|TLS ZEISS Super Speed 50mm T1.3 ]]\\ [[lens:TLSZeissSuper Speed65mmT1.3|TLS ZEISS Super Speed 65mm T1.3 ]]\\ [[lens:TLSZeissSuper Speed85mmT1.3|TLS ZEISS Super Speed 85mm T1.3 ]]\\ (Refer to Contributor Resources for formatting guidelines.) ---- ====== Key Figures ====== (List important figures that played a significant role within the company, past and present.) ---- ====== History ====== ===== (YEAR) ===== (Significant Events within this range...) ===== (YEAR) ===== (...and other events within this range.) ---- ====== Media ====== ---- ====== External Links ====== (Use this section for external reference links and source acknowledgement)