匈牙利天文摄影师Lóránd Fényes评测Optolong 窄带HO滤镜

匈牙利著名的天文摄影师Lóránd Fényes，长期担任匈牙利天文协会的讲师，作品发表在杂志和APOD上，获得各种国际奖项，给天文望远镜以及配件厂商提供产品测试，并且开设天文培训课：天文图片处理，拍摄，构图等等，网站每月点击量上千。这次Optolong的新款SHO 6.5/7nm窄带滤镜也由他来测试，并且提供了直观的对比图，得到了Lóránd Fényes的认可。

参数：

Observation point: Hungary, Piliscsev
Date: 11.02.2016
Seeing: 6/10
Transparency: 7/10
Sky quality: faint light pollution from south (Budapest, capital of Hungary is 30 kms away)
Expositions: 10 min each
Telescope: SkyWatcher Esprit 100/550
Mount: SkyWatcher AZ-EQ6 GT
CCD: QHY IC8300
Reductor: Riccardi Reducer 0.75x
Filters
Baader Ha 7nm 36mm
Baader OIII 8.5nm 36mm
Optolong Ha 7nm 36mm
Optolong OIII 6.5nm 36mm
Guiding: QHY5L-II

Baader H-alpha Narrowband 7nm vs Optolong H-Alpha 7nm

Quick summary

I made the same processing steps for the fair comparison: dark, flat, flatdark. Grey box: exactly the same area, same luminance values (C: 73%, M: 67%, Y: 65%, K: 80).

The signal-to-noise ratio of Baader HA filter measures lower contrast. The halo around the bright stars seems to be much more softer when using Optolong filter. I placed the more reflective side of the filters point away from the chip (on Baader filters the V marks the preferred orientation). Of course it is not a general rule and it is not only because of the filters. It depends on every system, for example in an optical system that put a lens or series of lenses close in front of the filter it can cause reflections. I have reflexions with Baader and Optolong too but the difference is visible.

Baader OIII Narrowband 8.5nm vs Optolong H-Alpha 6.5nm

Quick summary:

I made the same processing steps for the fair comparison: dark, flat, flatdark. Grey box: exactly the same area, same luminance values (C: 73%, M: 67%, Y: 65%, K: 80).

I had hard time with bader OIII since it results a rather uneven picture. It can be a major problem when dealing with very faint objects (there is a strong need to use the “curve” command). So even with the finest pics it requires lots of post-processing.

On the other hand the Optolong filter shows better contrast. Since it does result a very even background it is easy to process images

Lóránd Fényes的其他作品以及网站链接：
http://fenyeslorand.hu/optolong-vs-baader/

哇塞，大片

morning 发表于 2016-2-16 17:24

新年好！
期待更多的作品和经验分享！

老AK 发表于 2016-2-16 17:23
哇塞，大片

巴德的光晕这么感人。。。。。。

是Baader O3 vs Optolong O3吧，好像打错了哦