User_502260

<p>This kind of question has come up many times before. I will first say that the A-1 is not my favorite Canon manual focus camera. It has center weighted metering. The FTb/FTbN has 12 degree metering. It's easier to tell what you are metering off of. The FTb/FTbN has an easy to user depth of field lever. The A-1 has a balky depth fo field lever. The FTb/FTbN has mirror lock-up. I don't remember the A-1 having that feature. The A-1 has "factory" interchangeable focusing screens. Strictly speaking, the FTb/FTbN does not have interchangeable screens but I have heard of late FTbN split image/microprism screens being transplanted into earlier FTbNs and even older FTbs. There are accessory winders and motors for the A-1. The FTb/FTbN cameras accept neither. In a situation where the lighting is controlled, the various automatic exposure modes of the A-1 are not needed. The FTb or FTbN is easily repaired/serviced. With the A-1, if you have trouble with the electronics you may not be able to get it repaired. I have two A-1s, many FTbs and FTbNs and a lot of other Canon manual focus cameras, mostly the mechanical ones and the two hybrids, the F-1N and the EF. The FTbN shws the shutter speed in the finder. The FTb does not. Either would be a good start. The T90 is a whole different discussion but you would consider it if you needed a top shutter speed of more than 1/1000. With studio lighting you probably would not use the T90's top shutter speed and with flash you wouldn't be able to synch at a speed that high. </p>

<p>The short answer is that a lens with a fixed focal length, whether extended by its own helicoid, a bellows or extension tubes will have the same depth of field at a given magnification. The long answer is that some zoom lenses and fixed focal length lenses employ floating elements in their designs. This can cause the focal langth to change as the lens is focused (with it own helicoid) to its closest focusing distance. </p>

<p>From what I have been able to find out there were two different auto bellows for the ETR series cameras. I have the first version. I also have the 14 and 28 tubes. Bronica recommended against stacking extension tubes. I suppose someone could use one tube between the body and the bellows and then another one between the back of the lens and the front of the bellows but I have not tried this yet. It does not seem practical or possible to mount a reversed lens on the bellows but I might find a suitable lens to reverse mount to the front of the 100/4 macro.</p>

<p>I recently got a 100/4 Zenzanon E macro lens. After shooting a few rolls I think it's a decent performer. There was a shot of a flower on my last roll. The flower is an azalea and there is a bush behind it. The flower itself is sharp but behind it is what looks like swirling bokeh. In the past I have only seen this with zoom lenses. Has anyone else seen swirling bokeh with this lens? Does the newer 105 macro also show this? </p>

<p>When Zeiss Jena made the 55/1.4 Pancolar for the Pentacon Super, was the optical design copied from the 55/1.4 Zeiss Planar for the Contarex?</p>