[APML] TMB 115/805 - which focuser to choose

["Radek Kyml" <rkyml@tiscali.cz>]

Hello,

 

 I would like to buy TMB 115/805 refractor and I want it primarily for astrophoto, but I dont know which one to choose. 

 

 I refused to buy LW version because it has just 2" Feather touch focuser and I am worrying about vignetting even on 35 mm format. And if not Im sure it would be vignetting with 0,8 x focal reducer from Televue which I am planning to buy. And furthermore it would be unuseable for middle format (6x7 cm) which I dont want to use now but one never knows...

 

 

 So basically I have two options:

 

One is to buy that one with CNC tube with 3" CNC focuser and second one is to change focuser and buy one with 3,5" Feather touch focuser. I understand that both focusers are high-quality focusers but which one in your opinion is better for astrophoto ?

 

 

 

Thank you for any advice

Radek

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