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It is difficult to compare LCT540 and NT1a in details. I am not sure which one is better for silence recordings. Both have same specification of lowest self noise on the market, they have their own characteristics and after my NT1a mod, they seems to have slightly different polar pattern.
I record this audio samples at 24bit/48khz with 45dB gain (40Hz HPF) on MixPre6
In post I increase the gain approximately another 45dB and normalized to -5dB
The outcome is shown on the spectrograms on recording A and recording B. The LCT540 is above. NT1a below.

NT1a is extremely well focused in the mid-range 500hz – 5Khz. which is exactly the frequency where most common birds sing. So NT1a is very good for nature recordings. But sometimes NT1a sounds „flat“ because NT1a is rather poor on low frequency, sometimes like out of phase (which could be as well caused of wrong setup).
I have not a long experience recording with LCT540s, but at the moment the overall sound quality seems to be better than NT1a, especially in lower frequencies which give better „juicy“ sound and „depth feeling“. But at the same time it is not as „clear“ as NT1a in the mid range.

Following audio samples will give some insight how LCT540s compares to NT1a in silence. You can clearly compare the mics self noise which sounds almost equal.. You can also hear how this two microphones pick up the details in two alarm clocks and a pocket radio at the lowest level in ca 2,5m distance, inside ca 45m2 garage. Other background sound is a light gust outside which swipe the garage walls and roof, a fly in the window and a traffic in air and ground in the county. Anyway this is a silence which most people will barely hear anything else than just their own heartbeat. See pictures

How do they withstand humidity or handling noise in windscreen? I can only say this.
Both need DIY shock mount if they should be fit in Rycote windshield. Both are sensitive for handling noise especially NT1a. High humidity is usually not a problem for microphones in Iceland, but there are stories about problem with NT1a in other countries.
I will update this information/comparison as soon as I have got more experience with LCT540s. You can also search for NT1a and #LCT540s on this website and listen to nature recordings.

Listening with quality headphones will give best result.

Lewitt LCT540s Recording A (mp3 256kbps / 7Mb)

Rode NT1a Recording A (mp3 265kbps / 7Mb)

Lewitt LCT540s Recording B (mp3 256kbps / 4,8Mb)

Rode NT1a Recording B (mp3 256kbps / 4,8Mb)

Short comparison of both LCT540S & NT1a

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Látrabjarg, is a promontory and the western most point in Iceland (and Europe). The cliffs are a home to millions of birds, including puffins, northern gannets, guillemots, black legged kittiwake and razorbills. It is vital for their survival as it hosts up to 40% of the world population for some species e.g. the Razorbill. It is Europe’s largest bird cliff, 14km long and up to 440m high.(wikipedia)
This recording was made on the cliff edge in Ritugjá (Kittiwake Canyon), ca 90 meters above sea level and several hundreds meters fron Bjargtangar lighthouse. This recording contains mainly Kittiwake and chicks, also Razorbill which are mostly lower in the cliff

(mp3 256kbps / 58Mb)

Recorder: Sound devices MixPre6
Mics: DPA 4060 Baffled / binaural
Pix: Canon EOS-M
Location: 65.499899, -24.526950
Weather: Light breeze, clear sky
Rec. date & time: 9th of June 2016, around 1am

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Imagine, It is 3:30, mid summer morning. You are within five kilometers from the arctic circle and two and a half kilometers from the north Atlantic ocean. It is calm, and dry and the sun which has never goes completely down this night, gives a silk smooth light through thin layer of clouds. The biosphere is remarkable. It is visible everywhere. From bugs in the grass, fish in the brook to the birds in the air or in the field. All living species seems to be busy to live in beautiful harmony with Mother nature,
You are located at Skinnalónsheiði (heathland) which is close to Hraunhafnartangi peninsula, northern most part of Iceland.
Just a few weeks earlier this place was frozen under ice and snow, extremely quiet and almost a lifeless place.
The following recording is quiet, even though it’s biological busiest time of the year. Bird songs and call’s are mostly in the distance, but sometimes something catches the attention, like the wriggling fish in the brook, or different uncommon songs from different bird species.
Background noise is mostly surf from the ocean two and half kilometers away or sometimes swarm of midges.
Many bird species are in this recording. Whooper Swan, European Golden-Plover, Common Ringed Plover, Whimbrel (European), Black-tailed Godwit (islandica), Dunlin, Purple Sandpiper, Common Snipe, Common Redshank, Parasitic Jaeger, Great Black-backed Gull, Arctic Tern, Red-throated Loon, Meadow Pipit, Snow Bunting, Rock Ptarmigan and Great Northern Diver, Great Black-backed Gull, Graylag Goose, Long-tailed Duc.
Another recording was made that same night several kilometers away, nearby Hraunhafnartanga peninsula. Listening here.
Quality open headphones are recommended while listening at low to mid level, or in speakers at medium level.

(256mbps mp3 / 74Mb)

Recorder: Sound devices MixPre6
Mics: Sennheiser MKH20 (AB40)
Pics: LG G6
Location: 66.513116, -16.149781
Weather: Calm, dry, light clouds, 11C°
Recording date: 29th of May 2018

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Remote islands are interesting places. Almost every island has it’s own ecosystem which can be interesting to record. One of those islands is Elliðaey, which is a part of Vestmannaeyjar islands, south of Iceland.
I got an opportunity to go there on a 24 hours trip with Bob McGuire, which is recording birds in association with the Cornell Lab of Ornithology, Macaulay Library of Natural Sounds.
I am not a specialist in the ecosystem in Elliðaey so I will not say much about it here. It is slightly different between each island in the region and the bird species can be different from cliff to cliff
Our main target in Elliðaey was European storm petrel and Leach’s storm petrel. Bob was collecting individual calls and songs but I was going to record hours of ambiances. The bird colony gives a strong smell as usual, but this island also has a strong smell of sheep. For decades there have been several landowners and farmers from Heimaey island who keep there several dozens of sheep during the summertime.
Puffins have been in a very difficult situation for many years, especially south Iceland and Vestmannaeyjar islands. Mainly because some annually rhythm changes in the ocean biosphere. That situation was visible in Elliðaey. Probably more than 50% of the Puffins burrows were empty and abandoned and dead chicks were also visible around.
Not all birds have difficulties and many other bird species also live and breed in the island; Atlantic Puffin, Manx Shearwater, Leach’s Storm-petrel, European (British) Storm-petrel, Great Black-backed Gull, Lesser Black-backed Gull, Herring Gull, Black-legged Kittiwake, Northern Fulmar, Common Eider, Common Murre, Black Guillemot, Common Raven, European Starling, White Wagtail
As soon as we arrived I quickly found locations for the recorders and then we walked around in the bumpy landscape for other locations. We were early in the breeding season, 4th of June, so we were even not sure if birds we were going to record, like European storm petrel, had already arrived. What surprised me most was the silence in the interior island. No sound from the ocean waves or cliff birds, only wing flaps from busy birds above our heads, mostly puffins. But there was also a low rumbling noise, which filled the air and was difficult to locate. It took me time to figure out what it was, but it was from ships somewhere far away on the ocean, so far I could not even see them in the horizon. This noise never stopped when I was awake. It was just differently loud during day and the night, and of course louder when ship passed close to the island.
The following recording was made just before midnight on a hill south of the hut in the island, located almost in the middle of a puffin colony.
It is mostly puffins wing flaps, when they fly over, landed close by the microphones and sometimes a „spray & splash sound“ when they poop
Later that night both Leach’s Storm-petrel, European Storm-petrel surprisingly arrived to the island. But that will be for another blog.
Quality open headphones are recommended while listening at low to mid level, or in speakers at medium level.

(mp3 256kbps / 60.3Mb)

Recorder: Sound devices MixPre6
Mics: Sennheiser paralell MKH8020/8040 in AB40 (4ch)
Pix. LG G6
Location: 63.466604, -20.176682
Weather: Calm, misty & light shower, ca 12°C

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Frá því í byrjun ágúst 1984 til vors 1989 tók ég upp marga tónleika, bæði erlendra tónlistamanna sem innlendra. Margir þessara tónleika voru haldnir af hljómplötuútgáfunni Gramminu þar sem Ásmundur Jónsson var í forsvari. Ekki man ég hvernig það kom til að ég fór að taka upp þessa tónleika en líklega hefur upptökuáhugi minn orðið til þess að ég fór til Ása í Gramminu og bað hann leyfis um að taka upp. Tók hann því bara vel og fékk hann alltaf afrit af öllum tónleikum. Í einhverju tilfelli, einu eða tveimur, rötuðu þessar upptökur inn á plötuútgáfur að mig minnir eins og hjá frönsku hljómsveitinni Etron Fou Leloublan.
En upptökurnar voru misjafnar. Notaðist ég svo til eingöngu við Sennheiser video / reporter hljóðnema ME20 og ME80 með K3-U „Power modulum“ sem gengu fyrir 5,6 volta rafhlöðum. Þessar rafhlöður voru rándýrar og asnaðist ég oft til að nýta þær rúmlega til fulls sem því miður bitnaði á gæðum sumra hljóðrita. Við svo bættist að á mörgum tónleikum var það Tryggvi Þór Herbertsson sem sá um hljóðblöndun. Hann var alltaf að mínu mati hljóðböðull þegar kom að hljómgæðum. Hann hinsvegar, leit svo á að pönktónleikar ættu að hljóma „hráir og illa“ eins og hann sagði einhverntíma í viðtali við fjölmiðil og þar við sat. Vegna þessa eru margar þessara upptaka ekkert eyrnakonfekt. En þær hafa þó sögulegt gildi.
Fyrir 33 árum mætti ég með upptökutæki á tónleika í Hjáleigunni, sem var í húsnæði við hliðina á Kópavogsbíói. Svarthvítur draumur (S.H.Draumur) var aðal númer kvöldsins en Spilliköttur, Ást og Gakk sáu um upphitun.
Greinilega má heyra að nýjar rafhlöður voru í hljóðnemunum og enginn Tryggvi á mixernum frami í sal. Hér er því ágætis upptaka á ferð.
SH draumur spilaði 12 lög á þessum tónleikum en á upptökunni heyrast aðeins 11 lög. Ástæðan var sú að þegar þeir voru búnir að spila fjögur lög þurfti að skipta um kassettu. Á meðan á því stóð var lagi nr. 5 fórnað.
Þeir sem hafa áhuga og vilja heyra í upphitunarhljómsveitunum kvöldins þurfa ekki að örvænta. Það er líklegt að ég muni setja þær upptökur á vefinn innan tíðar.
Þess ber svo að geta að Dr. Gunni gaf leyfi fyrir því að meðfylgjandi upptaka færi á vefinn.

The punk-rockband Svart Hvítur Draumur, 24th of November 1985

As a recording amateur I recorded many concerts between August 1984 to May 1989. The recording collection from this period includes many bands and artists, like Andrew Syrelle, Skeleton Crew, Etron Fou Leloblan, Anthony Braxton, Marlyn Crispell, Leo Smith & New Delta Ahkri, Kukl, Sugarcubes, incluting Björk, Vonbrigði, Oxmá, Megas and many others, mainly Icelanders.
I always recorded this concerts with cassette recorder and two microphones. Without knowing it at that time, the Tapers community was popular in other countrys so afterwards I can say this recordings were my participate in the Tapers community.
The equipment I used was Sony TC-D5m cassette recorder and Sennheiser ME20 & ME80 microphones with K3-U power module. For several concerts I get borrowed a pair of Sennheiser MD441 which bring extra quality into those recordings .
Many of this recordings have poor quality while other are outstanding. The following recording below was recorded with a pair of ME20 so it is as good as it gets with that mic.
The Punk-rock band, Svart hvítur draumur (1982-88) or S.H.Draumur (Back & White Dream) was a trio and pretty popular in the eighties. This concert was held in Kópavogur, south of Reykjavík outskirt 24th of November 1985.

  (mp3 256kbps / 73Mb)

Recorder: Sony TC-D5M (AD transfer 24/48, Sound devices 744)
Mic: Sennheiser ME20
Pix: (Dr. Gunni)

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Ásbyrgi has a fantastic soundscape. It is one of the wonders of nature, a forested horse-shoe shaped canyon in Oxarfjordur. Asbyrgi is a part of Jökulsárgljúfur, within the Vatnajökull National Park.
I was there recording over night for ten hours 1st. of June 2018 . I don´t know if it was the time of the year, or something else, but the cliffs were very quiet this night. Usually I have been there later in June and July and the Fulmar in the cliffs have been noisier.
It was around 8 o´clock in the morning, just before the tourist traffic arrived that the soundscape in the canyon changed. It was like the whole biosphere woke up with lots of birds and insects activity. The following recording is the last 30 minutes that day before the soundscape was ruined by traffic noise and yelling tourists. Several bird species are in this recording. Northern Fulmar, Common Snipe, Eurasia Woodcock, Whimbrel, Red-Necked Phalarope, European golden Plover,  Pink footed Goose, Eurasian Wigeon, Eurasian Teal, Redwing, Common Redpoll, and Snow Bunting.
Here you can also listen to older posts from Ásbyrgi: Fairy in Ásbyrgi and Botnstjörn pond in Ásbyrgi.
Quality open headphones are recommended while listening at low to mid level, or in speakers at medium level.

  (mp3 256kbps/62,3Mb)

Recorder: Sound Devices MixPre6
Mics: Sennheiser MKH20 (AB40 setup)
Pix: LG G6
Location: 65°59’56.6″N 16°30’44.9″W
Weather: Clear sky, light gust, 5°C

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Last month I published hydrophone recording „Crawling glacier“ from the lagoon beneath Svínafellsjökul icefall.
The original recording contains two other channels with the sound above the lagoon.
It is not as clear in this short mp3 file as it is with headphones in the field, but during the recording it seems to be possible to hear the flow of the icefall though the valley. Its is a slow event. It usually starts high above in the mountain with rumbling sound and then slowly moves in a shock wave as a silk smooth „white noise“ though the valley all the way to the toe of the icefall. Regularly the ice moves faster in some places when the pressure get high. Then it cracks, some parts brake off and other just crawl faster which is usually audible for everyone.
This behavior of the glaciers is not often audible during the day because of traffic, wind or the clear sun which can easily disturb the sound waves in the air. Then it is also too slow for impatient listeners. Nights are usually the best time to hear this sound of the „flowing mass“. Changeable nature or different types of glaciers will also play a big rule how it acts and sounds.
Quality open headphones are recommended while listening at low to mid level, or in speakers at medium level.

(mp3 256kbps / 44,3Mb)

Recorder: Sound devices 788
Mics: Aquarian H2a-XLR & Sennheiser MKH20
Pix: Canon Eos M

Weather: Calm, cludy. 11°C
Location:64°00’12.7″N 16°52’39.6″W