Question 1

I am obviously not allowing for long enough exposures. all i get is a black sky! what iso should i use and how long should my exposures be?

Accepted Answer

Obviously, your exposure time depends on the ISO and f-stop you select and lens. Higher ISO's allow shorter exposure times with some loss in quality. Smaller f-stop (wider apertures) also allow shorter exposure times. An example, shooting meteor showers using a 14-24mm f2.8 zoom lens I used 15 sec exposure at f2.8 and ISO 1000 with a Nikon D850. For astrophotography, you need to adjust the times to minimize stars appearing to smear, if that is not an effect you desire. Search online for astrophotography or night sky photography for more hints. But try a range of exposure conditions to see what gives you the photos you want.

Question 2

Will this work on the canon 24-105 f4 if i purchase this also amazonbasics uv filter ??

Accepted Answer

Hi Jerry,

I do use my Bahtinov Focusing Mask, 77mm, snapped into a basic 77 mm UV Filter on most of my Astro lenses. It works great, easy to use, and the focus is sharp.  Try using a Rubber Band on the Zoom lens to prevent the Zoom lens from creeping movements.

The Bahtinov Focusing Mask should work just fine on your Canon 24-105 f4 lens.  Calibrate all of your lenses with your camera bodies.

Question 3

Do I have to use a filter to get this to connect properly?

Accepted Answer

the FP443  does not need a filter to help with connection.

Question 4

Can u put this on a dslr lens and the hood, or is it 1 or the other?

Accepted Answer

A Bahtinov focus aid come in various sizes, can be used on any lens (DSLR, Mirrorless, Telescope) and is used for night astrophotography. This size (77mm) fits my lenses. The way I use it is to mount it in a UV filter and gently screw it onto my lens to focus the lens on a bright star. Once the focus is set, remove the Bahtinov mask and filter you mounted it to so you can take your photos.

ASIN	B01BLVQ0KU
Best Sellers Rank	#34 in Camera Lens Infrared Filters
Brand	Farpoint
Coating Description	Multi Coating
Compatible Devices	DSLR cameras, telescopes
Customer Reviews	4.2 4.2 out of 5 stars (98)
Enclosure Material	rubber
Exposure Control Type	Manual (M)
Item Dimensions D x W x H	3"D x 3"W x 0.1"H
Item Dimensions L x W	3.03"L x 3.03"W
Manufacturer	Farpoint Astronomical Research
Manufacturer Part Number	FP438Series
Media Type	ProductImage
Model Number	FP443
Photo Filter Size	7.7 centimeters
Screen Size	7.7 centimeters
Special Effect	Skylight, Ultraviolet
Thread Size	7.7 centimeters
UPC	022099907114
Water Resistance Level	Not Water Resistant

77mm DSLR Camera Filter unmounted Bahtinov Mask, FP443

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