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ED Barlow imaging question


Rob
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I'm now thinking about using a barlow for DSO imaging through the 200P.. I have a t ring and will have a 1.25 nose piece (when delivered) next week. I already own a ED shorty Plus barlow in 1.25 + 3 x Vixen. But I'm now thinking about a 2" ED Barlow that I could use with the DMAX SLR adapter I've been using for prime on the 200P.

Whats the advantages of going 2" ED Barlow over the 1.25"?. Will I gain going the 2" route?.

Cheers

Rob

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If you use a 2X Barlow for DS imaging you will need 4 times the exposure for the same level of signal on the chip. Four times the sub length with attendant guiding problems. Only once or twice a year do we see Barlows in DS imaging on SGL. This is on the brightest targets. Are you sure you want to do it?

Olly

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