Does it make sense TAK106ED + Quark?

[Herra Kuulapaa]

Hi guys, valuable information and opinions are once again greatly appreciated

Does it make sense combining TAK106ED (with baader ERF) and Quark? Options would be either f/5 - 530mm or f/8 - 840mm (with 1.6 extender). F/5 setup would be too fast I think, but how about the f/8 one?

[xtreemchaos]

I use my Quark with f5 , f7.5, f9.5 with a 2inch erf screwed into the wedge. with the ed80 f7.5 I sometimes use a 50% reducer screwed into the ccd to get wider shots too, I'm not so lucky to have a Tak but thay behave the same as most fracs.  clear skys, charl.

[gnomus]

I'm not sure it would be wise to use the Tak with a Quark because of the Tak's rear elements.  Doublets and triplets would be fine of course.

[xtreemchaos]

so the Taks  Quad then , heres me thinking its a double, or is it one with elements in the focuser, I know you shouldn't use a quark with oil spaced fracs or ones with lenses in the focuser because of heat build up, but don't know if a infront ERF would make it safe but there real pricey and sometimes have to be custom made. charl.

[gnomus]

16 minutes ago, xtreemchaos said:

so the Taks  Quad then , heres me thinking its a double, or is it one with elements in the focuser, I know you shouldn't use a quark with oil spaced fracs or ones with lenses in the focuser because of heat build up, but don't know if a infront ERF would make it safe but there real pricey and sometimes have to be custom made. charl.

I haven't memorised the specs, but you should be able to look them up on the Tak site easily enough.

[gnomus]

1 hour ago, Herra Kuulapaa said:

Hi guys, valuable information and opinions are once again greatly appreciated

Does it make sense combining TAK106ED (with baader ERF) and Quark? Options would be either f/5 - 530mm or f/8 - 840mm (with 1.6 extender). F/5 setup would be too fast I think, but how about the f/8 one?

Those ballistics photos on your website are tremendous, by the way.

[xtreemchaos]

http://takahashi-europe.com/en/FSQ-106ED.php, I got it now ,Petzval Quad, nice looking piece of kit, don't think it would be safe with the Quark, but you could allways email takahshi, thay may know of a safe way. charl.

[DirkSteele]

Does the Quark use a front surface energy rejection filter?  i.e. over the front objective telescope?  If not, definitely not to be used with a petzval scope like the FSQ which has a doublet upfront and another at the rear near the focuser.  The heat build up on the rear elements would not be desirable for the long term health of the Takahashi.

EDIT: Whoops, just re-read your original post, see you are using the Baader ERF up front.  Certainly reduces the risk considerably.  Someone who knows the precise answer will be along shortly no doublt

 

[steppenwolf]

I have to say that my understanding of using a Quark with a Petzval design is that you shouldn't! The 106ED is a lovely instrument so tread very carefully here because its loveliness doesn't extend to use as a doorstop .....

[Herra Kuulapaa]

But it doesn't matter what the design is as long as you keep the energy out entering the scope with nice and "cheap" Baader ERF, right? Or am I missing something with the design?

[Davey-T]

12 minutes ago, Herra Kuulapaa said:

But it doesn't matter what the design is as long as you keep the energy out entering the scope with nice and "cheap" Baader ERF, right? Or am I missing something with the design?

You can't use a cheap ERF you need an EXPENSIVE ERF £1000 +

Dave

[xtreemchaos]

it dos sound like it would work with a front ERF,because there would be no heat send down the scope but with a tak and the cost of the scope and the fear of damaging it, id have to talk to takahashi, just make sure. charl

[Davey-T]

Something like this but I'd confirm it with an expert first.

Dave

http://astrograph.net/epages/www_astrograph_net.sf/en_GB/?ObjectPath=/Shops/www_astrograph_net/Products/AGDERF110C

[Herra Kuulapaa]

1 hour ago, Davey-T said:

You can't use a cheap ERF you need an EXPENSIVE ERF £1000 +

Dave

Heh, it was more like sarcasm calling it cheap

Anyway, I went to internet and found some examples: Tak with ERF combined with Quark

[Herra Kuulapaa]

A reply from TNR says it's ok to use with external ERF (front installed).

That makes it only 100nm red band entering into scope with the refractive NIR range filtered off.

 

[Herra Kuulapaa]

Hi guys!

This is what happened: Bought that nice and cheap 110mm Baader ERF ;)