60-600mm lens + 3 extenders = Total focal length?

[Okimar]

I'm a novice and completely confused after researching this question

Can anyone please tell me what the combined mm and magnification this with this arrangement on my Canon R?

 

 

[kvbarkley]

This chart might help a bit:

https://bobatkins.com/photography/eosfaq/closeup.htm

[kvbarkley]

You missed the extension tube. While not exactly at infinity, I think that the moon is far enough away to prevent focusing on it.

[ebiggs1]

I was assuming that anyone that was wanting to shoot the Moon has enough sense to not use an extension tube which is basically designed for close up macro work. not extending telephoto power. I would think this total combo for someone doing close up photography would find it impossible to get anything resembling decent results. In fact I think it not likely the OP can get a decent Moon shot with or without said extension tube.

[kvbarkley]

According to this calculator:

Adding an extension tube to a long lens won't buy you much:

https://thingsupclose.com/tools/extension-tube-magnification-calculator/

And here is where Ken Rockwell puts two extenders on an R

https://kenrockwell.com/canon/eos-r/r.htm

[Okimar]

I've actually been surprised to see what the acceptable clarity and brightness has been with this setup, given my budget.

I just opted to invest in this equipment over a cheap and otherwise useless telescope made in China that cost much much more if I want to take photos of what's seen thru the scope while giving up any communication between the camera and the scope.

So, people can tell me how wrong and stupid what I'm doing is, but that doesn't bother me at all.

I don't have Photoshop yet, as it's extremely expensive, but hope to find a non-subscription of it later this year.

[Okimar]

Actually, I don't have any trouble focusing on the moon at all. The reason the tube is between the magnifiers is because the Canon magnifiers I have simply will not stack together because of the internals.

[johnrmoyer]

I have stacked extenders for fun. I hope you have fun too. The biggest obstacle to photographing the moon is changes in air density between the camera and the moon.

The extender will

1. increase the F number
2. leave the minimum focus distance unchanged
3. reduce the contrast for small features
4. possibly magnify any defects in the lens
5. possibly increase small aperture diffraction blur

Canon DPP software "digital lens optimizer" does well at removing small aperture diffraction blur. If your camera can save DPRAW, then the DPRAW tool in DPP can correct some of the loss of contrast for small features. With extenders, I have been able to see the moons of Jupiter. The moon picture below was hand held and with a shutter speed of 1/20 second gave the IBIS a workout even though I was sitting in a chair with my elbows braced.

Others make better moon photos, but this was fun for me.

A Bumble Bee (Bombus pensylvanicus) was on a Zinnia in Norman, Oklahoma, United States on September 2, 2021. I made this photo with a very old lens as an experiment. I purchased the lens in 2011 and nearly wore it out. For this photo, it was attached to a newer camera body with an adapter with two telephoto extenders.

Canon EF70-300mm f/4-5.6 IS II USM ; Kenko Teleplus HD C-AF 2X DGX teleconverter ; EOS 80D ; This was taken hand held while sitting on a chair on my front porch. The gimp gmic plugin Richardson-Lucy deconvolution was used to remove small aperture diffraction blur. F/11 is wide open for this combination of lens and teleconverter. Focus was manual. After cropping and resizing to 40%, an unsharp mask was applied. https://www.rsok.com/~jrm/2017Feb07_birds_and_cats/2017feb01_cardinal_IMG_0929.html

Moon seen from Norman, Oklahoma, September 14, 2022 ; F/16 ; Focal length 1120mm ; EF100-400mm f/4.5-5.6L IS II USM +1.4x III + Kenko TELEPLUS HD C-AF 2X DGX

[ebiggs1]

"... because the Canon magnifiers I have simply will not stack together because of the internals."

Hmm, wonder if there is a reason?

[Okimar]

As I just replied in an above reply, you would be surprised how well this is working for me.

Call me whatever you want, but the only challenge I have taking great pictures of the moon is the gimbal I have doesn't point straight overhead. 

But, don't worry.  I'll eventually get a better attachment for my tripod for celestial photography, which will have the required range of motion and will have automatic tracking that will also handle this 13.8 pound camera and optic arrangement. 

[ebiggs1]

"I don't have Photoshop yet, as it's extremely expensive, ..."

There are free versions of Photoshop out there. One is Gimpshop and the very best free one is form Canon itself called DPP4. You can d/l it form the website. It is totally free and very capable.