If you could design a new eyepiece what would it be?

[alan potts]

John,

I have one, it is sharp but shows a bit os colour towards the edges, for a zoom it's excellent.

Alan.

[Saleratus]

A Delos 22.

[OneEyedSam]

how about an EP with a photomultiplier built in to enhance deep sky objects

[E621Keith]

how about an EP with a photomultiplier built in to enhance deep sky objects

They exist, but you need to apply for an export licence to buy it from America and an import licence to bring it into UK. The image intensifier (photomultiplier tube) is military hardware as far as the law is concerned.

http://www.nightvisionastronomy.com/

http://www.ceoptics.com/ccd/i3.html

http://www.cloudynig...hp?item_id=1834

Edit: Just did a bit more reading on NV equipments and apparently you need to be a registered defence exporter to obtain the export licence. In other word, you can't buy it outside USA.

[faulksy]

i would like something that gave me equal viewing of say my nirvana but with the power of my 9mm bgo, second choice would be an e.p. that could see through cloud

[OneEyedSam]

Cor ! What's mark Thatcher doing these days lol

[Alma]

The Speers Waler is a fine eyepiece but the focal lengths are just too long. For fast refractors that fl zone between 3mm and 4.5 mm is critical for drawing out the maximum magnification under given viewing conditions. 5mm is too long a starting point. The TV 3-6 mm is also parfocal throughout the range, so you really can "zoom" in on the target. It just needs to be ever so slightly longer I.m.o.