Borg 107FL is finally available

[AstroApprentice (Jason)]

A couple of years in the making, but Borg 107FL is finally available! at least I've had plenty of time to save...
https://digiborg.wordpress.com/2016/...icially-ready/

https://digiborg.wordpress.com

[gregbradley]

Sounds like a versatile scope. Also easily attached to a camera for birding photos.

I used a TEC 110 F5.6 and it was great. Loved the colours it produced.

I wonder how well the flattener works on large sensors though. That will be critical.

Also strange choice to use carbon fibre for the tube as its most unsuitable for refractors. I hope that doesn't weaken performance too much or perhaps the less focal shift with temperature may offset any thermal tube currents? Its only short focal length so you might get away with it.

Greg.

[AstroApprentice (Jason)]

Hi Greg,
I agree with strange CF option, weight reduction appears a key goal of Borg. Anyhow, everything Borg is interchangeable, so CF tubes do not have to be ordered. Plus The 107 FL objective component is aluminium.

[AstroApprentice (Jason)]

All metal Borg 107FL available:
https://digiborg.wordpress.com

[gregbradley]

Originally Posted by AstroApprentice

Hi Greg,
I agree with strange CF option, weight reduction appears a key goal of Borg. Anyhow, everything Borg is interchangeable, so CF tubes do not have to be ordered. Plus The 107 FL objective component is aluminium.

Sounds good.

I know the argument against CF for thermal reasons and tube currents but I wonder if it also makes focus more stable in shifting temperatures. My carbon fibre Planewave CDK is a marvel at focus stability throughout the night and also from night to night. Refocus is almost not needed.

Originally Posted by AstroApprentice

All metal Borg 107FL available:
https://digiborg.wordpress.com

Good to know.

This could be a hot widefield scope setup. Fluorite triplet F5.6 - mmm ymmy.

Did that with the TEC110 which was a gorgeous scope. I suspect the focuser would only be suitable for lightweight cameras.

The best setup there is to ditch a focuser altogether and use a FLI PDF or Atlas focuser and a fixed longish tube adapter so there is no flex and accurate focusing. Plus you can do thermal adjustments on the fly using Sky X focuser control which works reasonably well.
US$2700 for a scope like this in 2016 is a steal. The TEC110 was more like US$5600 and I don't even know if Yuri is making them anymore and if he is there would a longish wait and he was talking making them F6 at one point.

Greg.

[Slawomir (Suavi)]

This new telescope looks quite interesting. From the photos it looks like the objective lens section is secured with a single thumbscrew...makes me wonder whether this is a truly flex free solution for long exposures