Telescope Reviews: Re: Milkyway taken last year in Australia

Thanks for looking and the nice comments from all you guys, and sorry for being so late to reply your response to this thread because I am very busy with completing my academic tasks this week.

Ignor,

Yes, the dark site determines all. So sad that we have no dark sky in Hong Kong, and that is why all my star field images were not taken in HK.

The 90mm is a good lens but it is better to shoot at F4 or even slower. At F2.8, there is a little of coma and the stars are not so round at the corner. But I want to shoot more frames. So, let the 90mm be wide open. Next year, and if more stable weather to have, I will try shooting at F4 with this 90mm.

Because I drove everywhere for sightseeing to fulfill my wife's willing in daytime, sometimes even driving upto 700km in a day, I had been exhausted after the drive. So as to have imaging more comfortable, ungiding might be one of my best solution. And thanks for the high quality from Vixen's mount, there is no problem to go for 60 min unguided with the 90mm, even just using the built-in polar scope for polar alignment w/o any star dfrifting applied.

It is also quite difficult for us to find Fuji 400F here. There are Fuji 400x sold but it is less H-alpha sensitive than 400F. Luckily, E200 is still available but its supply is limited. I was quite afraid of that after 2 years, they would be disappearing from the market

I think you may agree that E200S has better red response and smaller grain than 400F. So, for shooting the milky way or the H-alpha rich objects like Eta, NGC 7000 and etc, I would prefer E200. But for comets, galaxies or globs, I may go with 400F.

Personally, I like the color presented by E200.

Jim,

There is no hope for wide field AP with films in Hong Kong. Do you know we have over 7 million people here? But HK is just about 1000 km2? Tall buildings and street lights are everywhere. If you want to have a AP trip to HK, just forget it. But for shopping and eating, that is a perfect place.

So jealous you have a ED400mm F4 lens. I had read a test report by Japanese nmany years before that it outperforms the 100SDUF astrography by Pentax also by a little bit.

In addition, more jealous you have such a nice and dark sky just at your backyard!

Clear skies,

LT

My website: http://www.william-lt-ng.com

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