Create EXIF Statics with LINQtoCSV

ExifMini.cs

using LINQtoCSV;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LINQtoCSVTest
{
    class ExifMini
    {
        [CsvColumn( FieldIndex = 1, Name = "FileName")]
        public string Name { get; set; }

        [CsvColumn(FieldIndex = 2, CanBeNull = true)]
        public string Camera { get; set; }

        [CsvColumn(FieldIndex = 3, CanBeNull = true)]
        public string TimeStamp { get; set; }

        [CsvColumn(FieldIndex = 4, CanBeNull = true)]
        public double FocalLength { get; set; }

        [CsvColumn(FieldIndex = 5, CanBeNull = true)]
        public double FocalLength35mmEq { get; set; }

        [CsvColumn(FieldIndex = 6, CanBeNull = true)]
        public double Non { get; set; }
    }
}

Program.cs

using LINQtoCSV;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LINQtoCSVTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var csvFileName = @"input.csv";
            var outputFileName = @"output.csv";
            var camera = @"LX2";

            var inputFileDescription = new CsvFileDescription {
                SeparatorChar = '\t'
                , EnforceCsvColumnAttribute = true
                , FirstLineHasColumnNames = false
            };
            var cc = new CsvContext();
            IEnumerable<ExifMini> exifs = cc.Read<ExifMini>(csvFileName, inputFileDescription);

            var CameraData =
                from exif in exifs
                where exif.Camera != null && exif.Camera.Contains(camera)
                orderby exif.FocalLength35mmEq
                select exif.FocalLength35mmEq;

            var focalLengths = CameraData.Distinct();
            var outputSb = new StringBuilder();
            foreach (var focalLength in focalLengths)
            {
                    var output =
                        from d in CameraData
                        where d == focalLength
                        select d;
                    var count = output.ToList<double>().Count();

                    outputSb.Append(focalLength.ToString()).Append("\t").AppendLine(count.ToString());
            }

            File.WriteAllText(outputFileName, outputSb.ToString());
        }
    }
}