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What do i need to use a L-Ultimate together with my Esprit 120

Sky-Watcher Esprit 120ED Optolong L-Ultimate Filters
5 replies•357 views
Anderl avatar
Anderl avatar
Hey,

I hadn’t planned to but rn i am able to get the new l-ultimate for a good price. 

until now i only used drop in filters for my dslm. 
what accessories do i need to use a 2-inch l-ultimate filter with my esprit 120?

is there a way to just screw it into the esprit without changing the backfocus? 

Thx and sorry for this probably stupid question. 

cs 
andreas
Ian McIntyre avatar
Ian McIntyre avatar
Filter drawer is required. I use the ZWO 2" drawer. You just pull out a spacer, or if you have an adjustable flattener, to subtract the width of the filter drawer from your backfocus. I don't have the specs on hand, but I believe it was 12.7mm for that particular drawer. I had the ZWO spacers for the ASI2600MC so there was a spacer of equal width.
Patrick Wood avatar
Patrick Wood avatar
You don’t need a filter drawer it will screw into the two piece extender that attaches to the flattener on the esprit 120

Brian Valente avatar
Brian Valente avatar
Yep - you need a filter drawer or filter wheel
Anderl avatar
Anderl avatar
Patrick Wood:
You don’t need a filter drawer it will screw into the two piece extender that attaches to the flattener on the esprit 120


Thx!

i will try it.
Brian Valente avatar
Brian Valente avatar
You could do that, but that means adding or removing it would be disassembling your image train, and your flats would need to be reshot every time