Lens and cell

Sky at Night Magazine - - FIRST LIGHT -

Us­ing Hoya FCD100 glass the lens of­fers crisp and sharp op­tics for imag­ing and visual as­tron­omy. The col­li­ma­tion screws are neatly hid­den be­hind the dew shield. The field of view is im­pres­sively flat to al­most the cor­ners of the image and any star dis­tor­tion is only seen on the largest of cam­era sen­sors. Imag­ing with an IMX 294 sen­sor showed the tini­est dis­tor­tion in the cor­ners of the image. The lens cell is a lit­tle dif­fer­ent to most tele­scopes in that it is made of steel and not al­loy. The prob­lem with large lenses held in al­loy is they can dis­tort un­der rapid tem­per­a­ture changes. The man­u­fac­turer has changed the de­sign a few times and this lat­est in­no­va­tion is a good so­lu­tion to an old prob­lem that ap­pears to have paid off; the op­tics were very sta­ble through­out the re­view pe­riod and needed next to no fo­cus ad­just­ment dur­ing imag­ing ses­sions. The only down­side is a lit­tle ex­tra weight on the front of the tele­scope.

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