Gina's All Sky Camera Mark 6 with Fujinon 1.4mm Fisheye Lens

[Gina]

On 26/08/2017 at 13:18, Horwig said:

Hi Gina, is this the type of lens you are using?

http://www.ebay.co.uk/itm/Fujinon-DF1-4HB-L1-Fish-Eye-C-Mount-Lens-Complete-with-Mount-Adapter-New-/252289716694?hash=item3abda391d6:g:rAYAAOSwQYZWw4h1

 

Huw

Certainly looks like it Huw   I didn't get the mount adapter with mine.

Edited August 27, 2017 by Gina

[Horwig]

Thanks Gina, am I right that you used to use a Fujinon zoom, like mine:

What's the light transmission through the prime like in comparison to the zoom? What kind of exposure differences are you seeing?

 

Thanks

Huw

[Gina]

I did indeed.  I may use it for a daytime ASC but there are 10000000000000000 projects to go before that   Probably

The difference in light throughput is enormous!  Anything from 4x to 10x better I would say probably nearer 10x.  I would have to look through my earlier threads to tell but I can say I was quite amazed at the difference.  Of course, the difference in area of the objective lenses is pretty big.

[Horwig]

Thanks Gina, will hide this post from my wallet (and wife)

 

Huw

[Gina]

It appears to be 6x better than the little ZWO prime lens and that was a lot better than the zoom lens.  Further than that I can't tell because I changed cameras.  But I used a 10s exposure with the ASI178MM camera.

[Horwig]

Thanks Gina, will attempt to resist temptation.

[Sp@ce_d]

Curiosity got the better of me having been playing around with a pi recently I just got one of those Fujinon DF1.4HB-L1 Fish Eye lenses Huw linked to. Although it doesn't have the adapter mentioned & shown in the picture, I've queried the seller & still waiting a reply. Anyway, I didn't find a measurement of the back focus required in my search of the threads.  9.7mm seems to come up in a google but so far my rummage in my adapters box has drawn a blank so will probably have to order something as hovering the lense over the sensor by hand is useless ?. I'm testing with a dmkau618 & a 314l+ at the moment.

[Gina]

A C to CS adapter then one of the ZWO cameras works well.  I use the ZWO ASI178MM USB 3.0 Mono Camera

[Delasaurus]

On 06/02/2017 at 12:04, Gina said:

It's a Fujinon fisheye 1.4mm f1.8.  I bought it from another member who bought it from ebay but since discontinued, I'm afraid.

Was thinking of these Gina as a quick waterproofing method to drop over, not sure on the optical quality though, might be worth a long shot.

http://www.ebay.co.uk/itm/Glass-Dome-Bell-Jar-Wooden-Base-Decorative-Collectables-Display-Cloche-Vase-Home-/253169838939

 

[Gina]

Optical quality would not be adequate unfortunately.

[tooth_dr]

Are there screw-on domes that can be purchased, with a rubber O-ring to prevent ingress of water?

[Gina]

I don't know of any screw on domes but many have a lip that can be used to hold them and you can use a sealing ring to stop damp getting in.  I use TPE or TPU 3D printing filament and make custom sealing rings with 3D printer.  These are a rubbery, flexible plastic.

[Craig55]

What a wealth of knowledge and experience on this thread! Thanks!

[lgrobe]

Hi,

I am a bit confused. I just bought one as a cs-mount lens on ebay:

https://www.ebay.de/itm/Fujinon-1-4mm-f-1-8-Fisheye-lens-CS-Mount-DF1-4HB-L1-Ideal-for-All-Sky-Camera/123866962892?hash=item1cd70bdbcc:g:HAkAAOSwDuZdSr43

I have a ZWO ASI 120mm. Since the camera is sold with a CS lens (150° fisheye), I hoped to be able to simply replace it. Yet I did not manage to get a sharp image out of this combination. The problem may be that I am not able to screw it deep enough into the M41 to C-mount adapter shipped with the camera - the threaded part of the lens is not very long, and the ZWO adapter is 7mm thick.

How did others attach this lens to the ASI 120mm?

Best, Lars.